Disturbance storm time index

Short description: Measure of the Earth's ring current

The disturbance storm time index, also known as the Dst index or Kyoto Dst index, is a measure of the strength of the Earth's ring current.[1]: 115 [2]

The ring current around Earth produces a magnetic field that is directly opposite Earth's magnetic field; that is, if the difference between solar electrons and protons gets higher, then Earth's magnetic field becomes weaker.

A negative Dst value means that Earth's magnetic field is weakened. This is particularly the case during solar storms.

Its units are typically measured in nT (nanoteslas).

## See also

* K-index

## References

1. ↑ Maynaud, P. N. (1980). Derivation, Meaning, and Use of Geomagnetic Indices. Geophysical Monograph Series. 22. Washington, D.C.: American Geophysical Union. doi:10.1029/GM022. ISBN 9781118663837. Bibcode: 1980GMS....22..607M.
2. ↑ Loewe, C. A.; Prölss, G. W. (1997). "Classification and mean behavior of magnetic storms". Journal of Geophysical Research: Space Physics 102 (A7): 14209-14213. doi:10.1029/96JA04020. Bibcode: 1997JGR...10214209L.

## External links

* The Dst index homepage provided by Kyoto University
* Dst at NOAA/NGDC
* Dst as part of SWENET Latest Alerts (on ESA's Space Weather Portal)

* v
* t
* e

Solar storms

* List of solar storms

Early|

* 774–775 solar event (hypothesized)
* 993–994 solar event (hypothesized)

1800s|

* Solar storm of 1859
* Aurora of November 17, 1882

1900s|

* May 1921 geomagnetic storm
* January 1938 geomagnetic storm
* Solar storm of August 1972
* March 1989 geomagnetic storm

2000s|

* Bastille Day Event, 2000
* Halloween solar storms, 2003
* Solar storm of 2012

See also|

* Solar flare
* Coronal mass ejection
* Coronal cloud
* Geomagnetic storm
* Solar particle event
* Space weather
* Heliophysics

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