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Titel The storm-time ring current: a statistical analysis at two widely separated low-latitude stations
VerfasserIn P. Francia, U. Villante, N. Adorante, W. D. Gonzalez
Medientyp Artikel
Sprache Englisch
ISSN 0992-7689
Digitales Dokument URL
Erschienen In: Annales Geophysicae ; 22, no. 10 ; Nr. 22, no. 10 (2004-11-03), S.3699-3705
Datensatznummer 250015041
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/angeo-22-3699-2004.pdf
 
Zusammenfassung
We conducted a statistical analysis of the geomagnetic field variations during the storm main phase at two low-latitude stations, separated by several hours in magnetic local time, in order to investigate the asymmetry and longitudinal extent of the storm-time ring current. The results show evidence for an asymmetric current which typically extends from evening to noon and, during moderate solar wind electric field conditions, up to the early morning, confirming the important role of the magnetospheric convection in the ring current energization. We also analyzed a possible relationship between the local current intensity during the storm main phase and the substorm activity observed at different time delays τ with respect to the storm onset. The results show a significant anticorrelation for τ =-1h, indicating that if the substorm activity is high just before the storm, a weaker ring current develops.
 
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