Abstract
In this paper, we advance the possibility of strong geomagnetic storms (called sometimes super geomagnetic storms) exciting oscillation modes of the magnetosphere with some defined periods. To determine this possibility, we analyze the whole period of duration of some particularly strong geomagnetic storms through the Fourier transformation. We obtain some results on the strongest geomagnetic storm of the time series, the one from March 1989.
Highlights
Geomagnetic storms (GS) are variations of short period on the Earth’s magnetosphere, ranging a few hours to some days
A super geomagnetic storm (SGS) is a GS characterized by values of the Dst index below −250 nT, and this kind of phenomena seems to show some oscillations during its declining phase on the times series of Dst index
Our method was applied on the SGS of March 13, 1989, and the results can be seen on what follows
Summary
Geomagnetic storms (GS) are variations of short period on the Earth’s magnetosphere, ranging a few hours to some days. A super geomagnetic storm (SGS) is a GS characterized by values of the Dst index below −250 nT, and this kind of phenomena seems to show some oscillations during its declining phase on the times series of Dst index. They are not (as the more intense earthquakes) very frequent. The GS classification is done according with the intensity of the lowest value measured during the event, and as seen in the work from [1], they can be labeled as seen on Table 1. According to the studies of [2] and [3], these phases have the following features:
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
