FM6: 16 July 2000, 12:39 UTC (2000-07-16UTC12:39Z) FM7: 16 July 2000, 12:39 UTC (2000-07-16UTC12:39Z) FM5: 09 August 2000, 11:13 UTC (2000-08-09UTC11:13Z) FM8: 09 August 2000, 11:13 UTC (2000-08-09UTC11:13Z)
Cluster II[2] is a space mission of the European Space Agency, with NASA participation, to study the Earth's magnetosphere over the course of nearly two solar cycles. The mission is composed of four identical spacecraft flying in a tetrahedral formation. As a replacement for the original Cluster spacecraft which were lost in a launch failure in 1996, the four Cluster II spacecraft were successfully launched in pairs in July and August 2000 onboard two Soyuz-Fregat rockets from Baikonur, Kazakhstan. In February 2011, Cluster II celebrated 10 years of successful scientific operations in space. In February 2021, Cluster II celebrated 20 years of successful scientific operations in space. As of March 2023[update], its mission has been extended until September 2024.[3] The China National Space Administration/ESA Double Star mission operated alongside Cluster II from 2004 to 2007.
The four identical Cluster II satellites study the impact of the Sun's activity on the Earth's space environment by flying in formation around Earth. For the first time in space history, this mission is able to collect three-dimensional information on how the solar wind interacts with the magnetosphere and affects near-Earth space and its atmosphere, including aurorae.
The spacecraft are cylindrical (2.9 x 1.3 m, see online 3D model) and are spinning at 15 rotations per minute. After launch, their solar cells provided 224 watts power for instruments and communications. Solar array power has gradually declined as the mission progressed, due to damage by energetic charged particles, but this was planned for and the power level remains sufficient for science operations. The four spacecraft maneuver into various tetrahedral formations to study the magnetospheric structure and boundaries. The inter-spacecraft distances can be altered and has varied from around 4 to 10,000 km. The propellant for the transfer to the operational orbit, and the maneuvers to vary inter-spacecraft separation distances made up approximately half of the spacecraft's launch weight.
The highly ellipticalorbits of the spacecraft initially reached a perigee of around 4 RE (Earth radii, where 1 RE = 6371 km) and an apogee of 19.6 RE. Each orbit took approximately 57 hours to complete. The orbit has evolved over time; the line of apsides has rotated southwards so that the distance at which the orbit crossed the magnetotail current sheet progressively reduced, and a wide range of dayside magnetopause crossing latitudes were sampled. Gravitational effects impose a long term cycle of change in the perigee (and apogee) distance, which saw the perigees reduce to a few 100 km in 2011 before beginning to rise again. The orbit plane has rotated away from 90 degrees inclination. Orbit modifications by ESOC have altered the orbital period to 54 hours. All these changes have allowed Cluster to visit a much wider set of important magnetospheric regions than was possible for the initial 2-year mission, improving the scientific breadth of the mission.
The European Space Operations Centre (ESOC) acquires telemetry and distributes to the online data centers the science data from the spacecraft. The Joint Science Operations Centre JSOC at Rutherford Appleton Laboratory in the UK coordinates scientific planning and in collaboration with the instrument teams provides merged instrument commanding requests to ESOC.
The Cluster Science Archive is the ESA long term archive of the Cluster and Double Star science missions. Since 1 November 2014, it is the sole public access point to the Cluster mission scientific data and supporting datasets. The Double Star data are publicly available via this archive. The Cluster Science Archive is located alongside all the other ESA science archives at the European Space Astronomy Center, located near Madrid, Spain. From February 2006 to October 2014, the Cluster data could be accessed via the Cluster Active Archive.
History
The Cluster mission was proposed to ESA in 1982 and approved in 1986, along with the Solar and Heliospheric Observatory (SOHO), and together these two missions constituted the Solar Terrestrial Physics "cornerstone" of ESA's Horizon 2000 missions programme. Though the original Cluster spacecraft were completed in 1995, the explosion of the Ariane 5 rocket carrying the satellites in 1996 delayed the mission by four years while new instruments and spacecraft were built.
On July 16, 2000, a Soyuz-Fregat rocket from the Baikonur Cosmodrome launched two of the replacement Cluster II spacecraft, (Salsa and Samba) into a parking orbit from where they maneuvered under their own power into a 19,000 by 119,000 kilometer orbit with a period of 57 hours. Three weeks later on August 9, 2000, another Soyuz-Fregat rocket lifted the remaining two spacecraft (Rumba and Tango) into similar orbits. Spacecraft 1, Rumba, is also known as the Phoenix spacecraft, since it is largely built from spare parts left over after the failure of the original mission. After commissioning of the payload, the first scientific measurements were made on February 1, 2001.
The European Space Agency ran a competition to name the satellites across all of the ESA member states.[4] Ray Cotton, from the United Kingdom , won the competition with the names Rumba, Tango, Salsa and Samba.[5] Ray's town of residence, Bristol, was awarded with scale models of the satellites in recognition of the winning entry,[6][7] as well as the city's connection with the satellites. However, after many years of being stored away, they were finally given a home at the Rutherford Appleton Laboratory.
Originally planned to last until the end of 2003, the mission has been extended several times. The first extension took the mission from 2004 until 2005, and the second from 2005 to June 2009. The mission has now been extended until September 2024.[3]
Scientific objectives
Previous single and two-spacecraft missions were not capable of providing the data required to accurately study the boundaries of the magnetosphere. Because the plasma comprising the magnetosphere cannot be viewed using remote sensing techniques, satellites must be used to measure it in-situ. Four spacecraft allow scientists make the 3D, time-resolved measurements needed to create a realistic picture of the complex plasma interactions occurring between regions of the magnetosphere and between the magnetosphere and the solar wind.
Each satellite carries a scientific payload of 11 instruments designed to study the small-scale plasma structures in space and time in the key plasma regions: solar wind, bow shock, magnetopause, polar cusps, magnetotail, plasmapause boundary layer and over the polar caps and the auroral zones.
The bow shock is the region in space between the Earth and the Sun where the solar wind decelerates from super- to sub-sonic before being deflected around the Earth. In traversing this region, the spacecraft make measurements which help characterize processes occurring at the bow shock, such as the origin of hot flow anomalies and the transmission of electromagnetic waves through the bow shock and the magnetosheath from the solar wind.
Behind the bow shock is the thin plasma layer separating the Earth and solar wind magnetic fields known as the magnetopause. This boundary moves continuously due to the constant variation in solar wind pressure. Since the plasma and magnetic pressures within the solar wind and the magnetosphere, respectively, should be in equilibrium, the magnetosphere should be an impenetrable boundary. However, plasma has been observed crossing the magnetopause into the magnetosphere from the solar wind. Cluster's four-point measurements make it possible to track the motion of the magnetopause as well as elucidate the mechanism for plasma penetration from the solar wind.
In two regions, one in the northern hemisphere and the other in the south, the magnetic field of the Earth is perpendicular rather than tangential to the magnetopause. These polar cusps allow solar wind particles, consisting of ions and electrons, to flow into the magnetosphere. Cluster records the particle distributions, which allow the turbulent regions at the exterior cusps to be characterized.
The regions of the Earth's magnetic field that are stretched by the solar wind away from the Sun are known collectively as the magnetotail. Two lobes that reach past the Moon in length form the outer magnetotail while the central plasma sheet forms the inner magnetotail, which is highly active. Cluster monitors particles from the ionosphere and the solar wind as they pass through the magnetotail lobes. In the central plasma sheet, Cluster determines the origins of ion beams and disruptions to the magnetic field-aligned currents caused by substorms.
The precipitation of charged particles in the atmosphere creates a ring of light emission around the magnetic pole known as the auroral zone. Cluster measures the time variations of transient particle flows and electric and magnetic fields in the region.
Instrumentation on each Cluster satellite
Number
Acronym
Instrument
Measurement
Purpose
1
ASPOC
Active Spacecraft Potential Control experiment
Regulation of spacecraft's electrostatic potential
Enables the measure by PEACE of cold electrons (a few eV temperature), otherwise hidden by spacecraft photoelectrons
2
CIS
Cluster Ion Spectroscopy experiment
Ion times-of-flight (TOFs) and energies from 0 to 40 keV
Composition and 3D distribution of ions in plasma
3
DWP
Digital Wave Processing instrument
Coordinates the operations of the EFW, STAFF, WBD and WHISPER instruments.
At the lowest level, DWP provides electrical signals to synchronise instrument sampling. At the highest level, DWP enables more complex operational modes by means of macros.
4
EDI
Electron Drift Instrument
Electric field E magnitude and direction
E vector, gradients in local magnetic field B
5
EFW
Electric Field and Wave experiment
Electric field E magnitude and direction
E vector, spacecraft potential, electron density and temperature
6
FGM
Fluxgate Magnetometer
Magnetic field B magnitude and direction
B vector and event trigger to all instruments except ASPOC
7
PEACE
Plasma Electron and Current Experiment
Electron energies from 0.0007 to 30 keV
3D distribution of electrons in plasma
8
RAPID
Research with Adaptive Particle Imaging Detectors
Electron energies from 39 to 406 keV, ion energies from 20 to 450 keV
3D distributions of high-energy electrons and ions in plasma
9
STAFF
Spatio-Temporal Analysis of Field Fluctuation experiment
Magnetic field B magnitude and direction of EM fluctuations, cross-correlation of E and B
Properties of small-scale current structures, source of plasma waves and turbulence
10
WBD
Wide Band Data receiver
High time resolution measurements of both electric and magnetic fields in selected frequency bands from 25 Hz to 577 kHz. It provides a unique new capability to perform Very-long-baseline interferometry (VLBI) measurements.
Properties of natural plasma waves (e.g. auroral kilometric radiation) in the Earth magnetosphere and its vicinity including: source location and size and propagation.
11
WHISPER
Waves of High Frequency and Sounder for Probing of Density by Relaxation
Electric field E spectrograms of terrestrial plasma waves and radio emissions in the 2–80 kHz range; triggering of plasma resonances by an active sounder.
Source location of waves by triangulation; electron density within the range 0.2–80 cm−3
Double Star mission with China
In 2003 and 2004, the China National Space Administration launched the Double Star satellites, TC-1 and TC-2, that worked together with Cluster to make coordinated measurements mostly within the magnetosphere. TC-1 stopped operating on 14 October 2007. The last data from TC-2 was received in 2008. TC-2 made a contribution to magnetar science[8][9] as well as to magnetospheric physics. The TC-1 examined density holes near the Earth's bow shock that can play a role in bow shock formation[10][11] and looked at neutral sheet oscillations.[12]
Awards
Cluster team awards
2019 Royal Astronomical Society Group Achievement Award[13]
2015 ESA 15th anniversary award
2013 ESA team award
2010 International Academy of Astronautics Laurels for team achievements for Cluster and Double Star teams[14]
2005 ESA Cluster 5th anniversary award
2004 NASA group achievement award
2000 Popular science best of what's new award
2000 ESA Cluster launch award
Individual awards
2023 Hermann Opgenoorth (Univ. of Umea, Sweden), former Cluster Ground Based Working Group lead, was awarded the 2023 EGU Julius Bartels Medal[15]
2020 Daniel Graham (Swedish Institute of Space Physics, Uppsala, Sweden) was awarded the COSPAR Zeldovich medal[16]
2019 Margaret Kivelson (UCLA, USA), Cluster FGM CoI, received RAS gold medal[17]
2018 Hermann Opgenoorth (Univ. of Umea, Sweden), former Cluster Ground Based Working Group lead, was awarded the 2018 Baron Marcel Nicolet Space Weather and Space Climate medal[18]
2016 Stephen Fuselier (SWRI, USA), Cluster CIS CoI, received EGU Hannes Alfvén Meda[19]
2016 Mike Hapgood, Cluster mission scientific operations expert was awarded the Baron Marcel Nicolet Medal for Space Weather and Space Climate[20]
2014 Rumi Nakamura (IWF, Austria), Cluster CIS/EDI/FGM CoI, received EGU Julius Bartels Medal[21]
2013 Mike Hapgood (RAL, UK), Cluster JSOC project scientist received RAS service award[22]
2013 Göran Marklund, EFW Co-I, received the EGU Hannes Alfvén Medal 2013.[23]
2013 Steve Milan, Cluster Ground based representative of the Cluster mission received UK Royal Astronomical Society (RAS) Chapman medal[24]
2012 Andrew Fazakerley, Cluster and Double Star PI (PEACE), received the Royal Astronomical Society Chapman Medal[25]
2012 Zuyin Pu (Pekin U., China), RAPID/CIS/FGM CoI, received AGU International Award[26]
2012 Jolene Pickett (Iowa U., USA), a Cluster WBD PI, received the State of Iowa Board of Regents Staff Excellence[27]
2012 Jonathan Eastwood (Imperial College, UK), FGM Co-I, received COSPAR Yakov B. Zeldovich medal[28]
2008 Andre Balogh (Imperial College, UK), Cluster FGM PI, received RAS Chapman medal[29]
2006 Steve Schwartz (QMW, UK), Cluster UK data system scientist and PEACE co-I, received RAS Chapman medal[25]
Discoveries and mission milestones
2023
April 28 - Magnetic reconnection at high and low latitudes during the passage of an ICME[30]
March 24 - Properties of Flapping Current Sheet of the Martian Magnetotail[31]
March 23 - Scaling laws for the energy transfer in space plasma turbulence[32]
March 01 - Turbulent MHD cascade in the Jovian magnetosheath[33]
January 26 - Evidence for lunar tide effects in Earth’s plasmasphere[34]
January 20 - Ion Outflow in Middle Altitude LLBL/Cusp from Different Origins[35]
2022
December 05 - Magnetosphere distortions during the “satellite killer” storm of February 3–4, 2022[36]
October 14 - New insights on the formation of transpolar auroral arc[37]
September 20 - A highway for atmospheric ion escape from Earth during the impact of an interplanetary coronal mass ejection[38]
August 03 - Joint Cluster/ground-based studies in the first 20 years of the Cluster mission[39]
July 18 – In situ observation of a magnetopause indentation that is correspondent to throat aurora and is caused by magnetopause reconnection[40]
June 16 - Kelvin-Helmholtz vortices as an interplay of Magnetosphere-Ionosphere coupling[41]
June 02 - ESA highlight: Magnetic vortices explain mysterious auroral beads[42][43]
May 16 - The influence of localized dynamics on dusk-dawn convection in the Earth’s magnetotail[44]
April 1 - Dawn-dusk ion flow asymmetry in the plasma sheet[45]
February 1 - South Pole Station ground-based and Cluster satellite measurements of leaked and escaping Auroral Kilometric Radiation[46]
January 1 - Massive multi-mission statistical study and analytical modeling of the Earth's magnetopause[47]
2021
December 15 - ESA highlight: Swarm and Cluster get to the bottom of geomagnetic storms[48][49]
November 7 - Unique MMS and Cluster observations about magnetic reconnection extent at the magnetopause[50]
November 2 - Spatial distribution of energetic protons in the magnetosphere based on 17 years of data[51]
October 11 - Unique MMS and Cluster observation of disturbances in the near-Earth magnetotail before a magnetic substorm[52]
September 7 - AGU EOS spotlight: Understanding Aurora Formation with ESA’s Cluster Mission[53]
May 2 - Cluster and MMS uncover anisotropic spatial correlation functions at kinetic range in the magnetosheath turbulence[54]
April 9 - The Solar-cycle Variations of the Anisotropy of Taylor Scale and Correlation Scale in the Solar Wind Turbulence[55]
February 18 - Heavy Metal and Rock in Space: Cluster RAPID Observations of Fe and Si[56]
2020
December 1 - Cluster, Helios and Ulysses reveal characteristics of solar wind supra thermal halo electrons[57]
November 1 - Cluster, Swam and CHAMP join forces to explain hemispheric asymmetries in the Earth magnetotail[58]
October 21 - Space plasma regimes classified with Cluster data[59]
October 1 - Effects of Solar Activity on Taylor Scale and Correlation Scale in Solar Wind Magnetic Fluctuations[60]
September 1 - Van Allen Probes and Cluster join forces to study Outer Radiation Belt Electrons[61]
August 9 - Cluster’s 20 years of studying Earth’s magnetosphere], celebrating 20 years after the launch of the second pair of Cluster spacecraft[62]
July 31 - ESA science highlight: Auroral substorms triggered by short circuiting of plasma flows[63][64]
July 16 - BBC skyatnight podcast with Dr. Mike Hapgood on 20 years of ESA’s Cluster mission,[65] celebrating 20 years after the launch of the first pair of Cluster satellites
April 20 - What drives some of the largest and most dynamic auroral forms?[66]
March 19 - ESA science highlight: Iron is everywhere in Earth's vicinity, suggest two decades of Cluster data[67][68]
February 27 - What makes Kelvin Helmholtz vortices grow at the Earth's magnetopause?[69]
2019
December 23 - Magnetized dust clouds penetrate the terrestrial bow shock[70]
November 18 - Earth’s magnetic song recorded for the first time during a solar storm[71][72]
October 10 - What is the source of the energetic oxygen ions found in the high-altitude cusp region?[73]
August 27 - Cluster and XMM pave the way for SMILE[74][75]
August 20 - Asymmetric transport of the Earth's polar outflows by the interplanetary magnetic field[76]
August 5 - Energetic electron acceleration found by Cluster in unconfined reconnection jets for the first time[77]
May 1 - Kelvin‐Helmholtz waves magnetic curvature and vorticity: Four‐spacecraft Cluster observations[78]
Escoubet, C.P.; A. Masson; H. Laakso; M.L. Goldstein (2021). "Cluster after 20 years of operations: Science highlights and technical challenges". Journal of Geophysical Research: Space Physics126 (8). doi:10.1029/2021JA029474. Bibcode: 2021JGRA..12629474E.
Escoubet, C.P.; A. Masson; H. Laakso; M.L. Goldstein (2015). "Recent highlights from Cluster, the first 3-D magnetospheric mission". Annales Geophysicae33 (10): 1221–1235. doi:10.5194/angeo-33-1221-2015. Bibcode: 2015AnGeo..33.1221E.
Escoubet, C.P.; M. Taylor; A. Masson; H. Laakso; J. Volpp; M. Hapgood; M.L. Goldstein (2013). "Dynamical processes in space: Cluster results". Annales Geophysicae31 (6): 1045–1059. doi:10.5194/angeo-31-1045-2013. Bibcode: 2013AnGeo..31.1045E.
Taylor, M.; C.P. Escoubet; H. Laakso; A. Masson; M. Goldstein (2010). "The Cluster Mission: Space Plasma in Three Dimensions". in H. Laakso. The Cluster Active Archive. Astrophysics and Space Science Proceedings. Astrophys. & Space Sci. Proc., Springer. pp. 309–330. doi:10.1007/978-90-481-3499-1_21. ISBN978-90-481-3498-4.
All 3701 publications related to the Cluster and the Double Star missions (count as of 31 December 2023) can be found on the publication section of the ESA Cluster mission website. Among these publications, 3208 are refereed publications, 342 proceedings, 121 PhDs and 30 other types of theses.
↑Schwartz, S. (2005). "A γ-ray giant flare from SGR1806-20: evidence for crustal cracking via initial timescales". The Astrophysical Journal627 (2): L129–L132. doi:10.1086/432374. Bibcode: 2005ApJ...627L.129S.
↑Wing, S.Expression error: Unrecognized word "etal". (2023). "Multispacecraft Observations of the Simultaneous Occurrence of Magnetic Reconnection at High and Low Latitudes During the Passage of a Solar Wind Rotational Discontinuity Embedded in the April 9-11, 2015 ICME". Geophys. Res. Lett.50 (9). doi:10.1029/2023GL103194. Bibcode: 2023GeoRL..5003194W.
↑Zhang, C.Expression error: Unrecognized word "etal". (2023). "Properties of Flapping Current Sheet of the Martian Magnetotail". Journal of Geophysical Research: Space Physics128 (4). doi:10.1029/2022JA031232. Bibcode: 2023JGRA..12831232Z.
↑Li, B.Expression error: Unrecognized word "etal". (2023). "Cluster Observation of Ion Outflow in Middle Altitude LLBL/Cusp from Different Origins". Magnetochemistry9 (2): 39. doi:10.3390/magnetochemistry9020039.
↑Tsyganenko, N.A.; Andreeva, V.A.; Sitnov, M.I.; Stephens, G.K. (2022). "Magnetosphere distortions during the "satellite killer" storm of February 3–4, 2022, as derived from a hybrid empirical model and archived data mining". Journal of Geophysical Research: Space Physics127 (12). doi:10.1029/2022JA031006. Bibcode: 2022JGRA..12731006T.
↑Li, W. (2022). "The Dawn-Dusk Tail Lobe Magnetotail Configuration and the Formation of Aurora Transpolar Arc". Journal of Geophysical Research: Space Physics127 (10). doi:10.1029/2022JA030676. Bibcode: 2022JGRA..12730676L.
↑Zhang, H. (2022). "A highway for atmospheric ion escape from Earth during the impact of an interplanetary coronal mass ejection". Astrophysical Journal937 (4): 4. doi:10.3847/1538-4357/ac8a93. Bibcode: 2022ApJ...937....4Z.
↑Qiu, H.Expression error: Unrecognized word "etal". (2022). "In situ observation of a magnetopause indentation that is correspondent to throat aurora and is caused by magnetopause reconnection". Geophys. Res. Lett.49 (15). doi:10.1029/2022GL099408. Bibcode: 2022GeoRL..4999408Q.
↑Hwang, K.-J.Expression error: Unrecognized word "etal". (2022). "Kelvin-Helmholtz vortices as an interplay of Magnetosphere-Ionosphere coupling". Frontiers in Astronomy and Space Sciences9: 895514. doi:10.3389/fspas.2022.895514. Bibcode: 2022FrASS...9.5514H.
↑Petrinec, S.M.Expression error: Unrecognized word "etal". (2022). "Multi-Spacecraft Observations of Fluctuations Occurring Along the Dusk Flank Magnetopause, and Testing the Connection to an Observed Ionospheric Bead". Frontiers in Astronomy and Space Sciences9: 827612. doi:10.3389/fspas.2022.827612. Bibcode: 2022FrASS...927612P.
↑Lane, J.H.; Grocott, A.; Case, N.A. (2022). "The influence of localized dynamics on dusk-dawn convection in the Earth's magnetotail". Journal of Geophysical Research: Space Physics127 (5). doi:10.1029/2021JA030057. Bibcode: 2022JGRA..12730057L.
↑Marklund, G.; Lindqvist, P.-A. (2021). "Cluster Multi-Probing of the Aurora During Two Decades". Journal of Geophysical Research: Space Physics126 (6). doi:10.1029/2021JA029497. Bibcode: 2021JGRA..12629497M.
↑Zhou, H.; He, H.-Q. (2021). "The Solar-cycle Variations of the Anisotropy of Taylor Scale and Correlation Scale in the Solar Wind Turbulence". Astrophysical Journal Letters911 (1): L2. doi:10.3847/2041-8213/abef00. Bibcode: 2021ApJ...911L...2Z.
↑Haaland, S. (2021). "Heavy Metal and Rock in Space: Cluster RAPID Observations of Fe and Si". Journal of Geophysical Research: Space Physics126 (3). doi:10.1029/2020JA028852. Bibcode: 2021JGRA..12628852H.
↑Hatch, S.M.; Haaland, S. (2020). "Seasonal and hemispheric asymmetries of F region polar cap plasma density: Swarm and CHAMP observations". Journal of Geophysical Research: Space Physics125 (11): e2020JA028084. doi:10.1029/2020JA028084. Bibcode: 2020JGRA..12528084H.
↑Bakrania, M.R.; Rae, I.J.; Walsh, A.P. (2020). "Using Dimensionality Reduction and Clustering Techniques to Classify Space Plasma Regimes". Front. Astron. Space Sci.7 (80): 80. doi:10.3389/fspas.2020.593516. Bibcode: 2020FrASS...7...80B.
↑Zhou, G.; He, H.-Q.; Wan, W. (2020). "Effects of Solar Activity on Taylor Scale and Correlation Scale in Solar Wind Magnetic Fluctuations". The Astrophysical Journal Letters899 (L32): L32. doi:10.3847/2041-8213/abaaa9. Bibcode: 2020ApJ...899L..32Z.
↑Aryan, H.; Agapitov, O.V. (2020). "Outer Radiation Belt Electron Lifetime Model Based on Combined Van Allen Probes and Cluster VLF Measurements". Journal of Geophysical Research: Space Physics125 (8): e2020JA028018. doi:10.1029/2020JA028018. Bibcode: 2020JGRA..12528018A.
↑Mishin, E.; Streltsov, A. (2020). "Prebreakup Arc Intensification due to Short Circuiting of Mesoscale Plasma Flows Over the Plasmapause". Journal of Geophysical Research: Space Physics125 (5): e2019JA027666. doi:10.1029/2019JA027666. Bibcode: 2020JGRA..12527666M.
↑Haaland, S.; Daly, P.W.; Vilenius, E.; Dandouras, I. (2020). "Suprathermal Fe in the Earth's plasma environment: Cluster RAPID observations". Journal of Geophysical Research: Space Physics125 (2): e2019JA027596. doi:10.1029/2019JA027596. Bibcode: 2020JGRA..12527596H.
↑Lai, H.R.; Russell, C.T.; Jia, Y.D.; Connors, M. (2019). "First observations of the disruption of the Earth's foreshock wave field during magnetic clouds". Geophysical Research Letters46 (24): 14282–14289. doi:10.1029/2019GL085818.
↑Connor, H.K.; Carter, J.A. (2019). "Exospheric neutral hydrogen density at the nominal 10 RE subsolar point deduced from XMM-Newton X-ray observations". Journal of Geophysical Research: Space Physics124 (3): 1612–1624. doi:10.1029/2018JA026187. Bibcode: 2019JGRA..124.1612C.
↑Chen, G.; Fu, H.S.; Zhang, Y.; Li, X.; Ge, Y.S.; Du, A.M.; Liu, C.M.; Xu, Y. (2019). "Energetic electron acceleration in unconfined reconnection jets". The Astrophysical Journal881 (1): L8. doi:10.3847/2041-8213/ab3041. Bibcode: 2019ApJ...881L...8C.
↑Kieokaew, R.; Foullon, C. (2019). "Kelvin-Helmholtz waves magnetic curvature and vorticity: Four-spacecraft Cluster observations". Journal of Geophysical Research: Space Physics124 (5): 3347–3359. doi:10.1029/2019JA026484. Bibcode: 2019JGRA..124.3347K.
↑Damiano, P.A.; Chaston, C.C.; Hull, A.J.; Johnson, J.R. (2018). "Electron distributions in kinetic scale field line resonances: A comparison of simulations and observations". Geophysical Research Letters45 (12): 5826–5835. doi:10.1029/2018GL077748. Bibcode: 2018GeoRL..45.5826D.
↑Fu, H.S.; Xu, Y.; Vaivads, A.; Khotyaintsev, Y.V. (2019). "Super-efficient electron acceleration by an isolated magnetic reconnection". Astrophysical Journal Letters870 (L22): L22. doi:10.3847/2041-8213/aafa75. Bibcode: 2019ApJ...870L..22F.
↑Slapak, R.; Nilsson, H. (2018). "The Oxygen Ion Circulation in The Outer Terrestrial Magnetosphere and Its Dependence on Geomagnetic Activity". Geophys. Res. Lett.45 (23): 12,669– 12,676. doi:10.1029/2018GL079816. Bibcode: 2018GeoRL..4512669S.
↑Schillings, A.; Nilsson, H.; Slapak, R.; Wintoft, P.; Yamauchi, M.; Wik, M.; Dandouras, I.; Carr, C.M. (2018). "O+ escape during the extreme space weather event of 4–10 September 2017". Space Weather16 (4): 1363–1376. doi:10.1029/2018sw001881. Bibcode: 2018SpWea..16.1363S.
↑Liebert, E.; Nabert, C.; Glassmeier, K.-H. (2018). "Statistical survey of day-side magnetospheric current flow using Cluster observations: bow shock". Annales Geophysicae36 (4): 1073–1080. doi:10.5194/angeo-36-1073-2018. Bibcode: 2018AnGeo..36.1073L.
↑Coxon, J.C.; Freeman, M.P.; Jackman, C.M.; Forsyth, C.; Rae, I.J.; Fear, R.C. (2018). "Tailward propagation of magnetic energy density variations with respect to substorm onset times". Journal of Geophysical Research: Space Physics123 (6): 4741–4754. doi:10.1029/2017JA025147. Bibcode: 2018JGRA..123.4741C.
↑Roberts, O. W.; Narita, Y.; Escoubet, C.-P (2018). "Three-dimensional density and compressible magnetic structure in solar wind turbulence". Annales Geophysicae36 (2): 527–539. doi:10.5194/angeo-36-527-2018. Bibcode: 2018AnGeo..36..527R.
↑Hadid, L. Z.; Sahraoui, F.; Galtier, S.; Huang, S. Y. (January 2018). "Compressible Magnetohydrodynamic Turbulence in the Earth's Magnetosheath: Estimation of the Energy Cascade Rate Using in situ Spacecraft Data". Physical Review Letters120 (5): 055102. doi:10.1103/PhysRevLett.120.055102. PMID29481187. Bibcode: 2018PhRvL.120e5102H.
↑Andreeva V. A.; Tsyganenko N. A. (2017). "Empirical Modeling of the Quiet and Storm Time Geosynchronous Magnetic Field". Space Weather16 (1): 16–36. doi:10.1002/2017SW001684. Bibcode: 2018SpWea..16...16A.
↑Roberts, O.W.; Y. Narita; C.P. Escoubet (2017). "Direct measurement of anisotropic and asymmetric wave vector Spectrum in ion-scale solar wind turbulence". The Astrophysical Journal851 (1): L11. doi:10.3847/2041-8213/aa9bf3. Bibcode: 2017ApJ...851L..11R.
↑Perrone, D.; O. Alexandrova; O.W. Roberts; S. Lion; C. Lacombe; A. Walsh; M. Maksimovic; I. Zouganelis (2017). "Coherent structures at ion scales in the fast solar wind: Cluster observations". The Astrophysical Journal849 (1): 49. doi:10.3847/1538-4357/aa9022. Bibcode: 2017ApJ...849...49P.
↑Yushkov, E.; A. Petrukovich; A. Artemyev; R. Nakamura (2017). "Relationship between electron field-aligned anisotropy and dawn-dusk magnetic field: nine years of Cluster observations in the Earth magnetotail". Journal of Geophysical Research: Space Physics122 (9): 9294–9305. doi:10.1002/2016JA023739. Bibcode: 2017JGRA..122.9294Y.
↑Giagkiozis, S.; S. N. Walker; S. A. Pope; G. Collinson (2017). "Validation of single spacecraft methods for collisionless shock velocity estimation". Journal of Geophysical Research: Space Physics122 (8): 8632–8641. doi:10.1002/2017JA024502. Bibcode: 2017JGRA..122.8632G.
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