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.[1]

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

1. ↑ Masters, Jeff. "A future Space Weather catastrophe : a disturbing possibility". Weather Underground. https://www.wunderground.com/blog/JeffMasters/a-future-space-weather-catastrophe--a-disturbing-possibility.html. Retrieved 16 October 2017.

## 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)

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