View source for Disturbance storm time index

{{Short description|Measure of space weather around Earth}}
The '''disturbance storm time''' ('''Dst''', '''Kyoto Dst''') index is a measure in the context of [[space weather]]. It gives information about the strength of the [[ring current]] around Earth caused by solar protons and electrons.<ref name=WU-JM>{{cite web|last=Masters|first=Jeff|title=A future Space Weather catastrophe : a disturbing possibility|url=https://www.wunderground.com/blog/JeffMasters/a-future-space-weather-catastrophe--a-disturbing-possibility.html|publisher=Weather Underground|accessdate=16 October 2017}}</ref> 

The ring current around Earth produces a magnetic field that is directly opposite Earth's magnetic field, i.e. 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.

==See also==

* [[K-index]]

==References==
<references/>
==External links==
* The [http://wdc.kugi.kyoto-u.ac.jp/dstdir/ Dst index homepage] provided by Kyoto University
* Dst at [http://www.ngdc.noaa.gov/stp/GEOMAG/dst.html NOAA/NGDC]
* Dst as part of SWENET [http://www.esa-spaceweather.net/swenet/login?cmd=swenet_latest_alerts Latest Alerts] {{Webarchive|url=https://web.archive.org/web/20120209110443/http://www.esa-spaceweather.net/swenet/login?cmd=swenet_latest_alerts |date=2012-02-09 }} (on [[ESA]]'s Space Weather Portal)

{{DEFAULTSORT:Disturbance Storm Time Index}}
[[Category:Planetary science]]
[[Category:Radio frequency propagation]]
[[Category:Electric and magnetic fields in matter]]
[[Category:Solar System]]
[[Category:Space weather]]
[[Category:Electromagnetism]]


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