HR: 0800h
AN: SM31A-07    [Abstracts]
TI: Ring current asymmetry during intense and superintense magnetic storms
AU: * Echer, E
EM: eecher@dge.inpe.br
AF: Instituto Nacional de Pesquisa Espaciais, Avenida Astronautas 1758, Sao Jose Camps, SP 12227010, Brazil
AU: Gonzalez, W D
EM: gonzalez@dge.inpe.br
AF: Instituto Nacional de Pesquisa Espaciais, Avenida Astronautas 1758, Sao Jose Camps, SP 12227010, Brazil
AB: It is well known that, during the main phase development of magnetic storms, the ring current encircling Earth at equatorial plane is strongly asymmetric. The degree of this asymmetry, however, should depend on the storm intensity. In order to assess these behavior, we study 15 intense (-250 < Dst -100 nT) and 15 super-intense (Dst -250 nT) magnetic storms. The geomagnetic indices ASY-H and SYM-H are employed and their ratio ASY/SYM is used as an indicator for the storm asymmetry. We have found that super-intense storms have a large degree of asymmetry around the storm peak. The average and median of the ASY/SYM ratio is found to be 15% higher form super-intense storms as compared to intense storms.
DE: 2721 Field-aligned currents and current systems (2409)
DE: 2740 Magnetospheric configuration and dynamics
DE: 2778 Ring current
DE: 2784 Solar wind/magnetosphere interactions
DE: 7954 Magnetic storms (2788)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Joint Assembly