SWAP (instrument)

Short description: Space instrument aboard the PROBA2 satellite

SWAP

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The Sun Watcher using Active Pixel System Detector and Image Processing (SWAP) telescope is a compact extreme-ultraviolet (EUV) imager on board the PROBA-2 mission.[1] SWAP provides images of the solar corona at a temperature of roughly 1 million degrees. the instrument was built upon the heritage of the Extreme ultraviolet Imaging Telescope (EIT) which monitored the solar corona from the Solar and Heliospheric Observatory from 1996 until after the launch of the Solar Dynamics Observatory in 2010.

SWAP's coronal mass ejection (CME) watch program has collected images at an improved image cadence (typically 1 image every few minutes) since the PROBA-2 launch in 2009. These events include EIT waves (global waves propagating across the solar disc from the CME eruption site),[2] EUV dimming regions (transient coronal holes from where the CME has lifted off),[3] filament instabilities (a specific type of flickering during the rise of a filament). SWAP's EUV images of the corona routinely extend beyond 2 solar radii from the surface of the Sun, much farther than was thought possible before the mission was launched.[4] This led to the discovery, in 2021 by Seaton et al.[5] using the SUVI instrument on board NOAA's GOES satellite, that the extended solar corona is visible in the extreme-ultraviolet, out to at least 3 solar radii from the center of the Sun.

SWAP was built at the Liège Space Center and is operated from the PROBA-2 Science Center at the Royal Observatory of Belgium.

SWAP has been used to study coronal brightspot dynamics.[6]

## See also

* SWAP (New Horizons) (solar wind detector on Pluto flyby probe)

## References

1. ↑ Berghmans, D. et al. 2006:"SWAP onboard PROBA 2, a new EUV imager for solar monitoring", *Adv. Sp. Res.* 38.8: 1807 (doi:10.1016/j.asr.2006.03.070)
2. ↑ Gallagher, P.T. and Long, D.M., 2010: "Large-scale bright fronts in the solar corona: a review of EIT waves", ArXiV preprint 1006.0140.
3. ↑ Temmer, M., Veronig, A.M., Peinhart, V., and Vrsnak, B., 2014: "Asymmetry in the CME-CME interaction process for the events form 2011 February 14-15", *Astrophys. J.* 852, 85.
4. ↑ O'Hara, J.P., et al. 2017: "Exceptional Extended Field-of-view Observations by PROBA2/SWAP on 2017 April 1 and 3", *Astrophys. J.* 883, 59 (doi:10.3847/1538-4357/ab3b08).
5. ↑ Seaton, D.B. et al. 2021: "The Sun's dynamic extended corona observed in extreme ultraviolet", *Nature Astronomy* 5, 1029 (doi:10.1038/s41550-021-01427-8).
6. ↑ Kalugodu, Chandrashekhar; Sayamanthula, Krishna Prasad; Banerjee, Dipankar; Ravindra, B; Seaton, D (2013-01-01). "Dynamics of Coronal Bright Points as Seen by Sun Watcher Using Active Pixel System Detector and Image Processing (SWAP), Atmospheric Imaging Assembly (AIA), and Helioseismic and Magnetic Imager (HMI) PROBA2 – First Two Years of Solar Observation Guest Editors". Solar Physics 286: 125–142. doi:10.1007/s11207-012-0046-1. https://www.researchgate.net/publication/259619424.

## External links

* SWAP data

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