Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm54b..02g&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM54B-02
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner
Scientific paper
The interplanetary causes of intense geomagnetic storms (Dst ≤ -100 nT) that occurred during solar cycle 23 (1997-2005) will be presented. The most common interplanetary structures leading to the development of intense storms were: magnetic clouds, sheath fields, sheath fields followed by a magnetic cloud and corotating interaction regions at the leading fronts of high speed streams. However, the relative importance of each of those driving structures changes with the solar cycle phase. Superintense storms (Dst ≤ -250 nT) have also been studied in more detail for solar cycle 23, confirming initial studies done about their main interplanetary causes. The storms are associated with magnetic clouds and sheath fields following interplanetary shocks, although they frequently involve consecutive and complex ICME structures. Concerning extreme storms (Dst ≤ -400 nT), due to the poor statistics of their occurrence during the space era, only some indications about their main interplanetary causes are known. For the most extreme events, we will discuss the Carrington event and also the distribution of historical and space era extreme events in the context of the sunspot and Gleissberg solar activity cycles, highlighting a discussion about the eventual occurrence of more Carrington-type storms.
Clua de Gonzalez Alicia L.
Echer Ezequiel
Gonzalez Walter D.
Tsurutani Bruce T.
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