Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1661l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1661
Physics
2716 Energetic Particles: Precipitating, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Geomagnetic storms can significantly suppress geomagnetic shielding of solar energetic particles (SEPs). This is caused by a reduction in field strength in the inner magnetosphere due to ring current buildup and is correlated with the depression and recovery of the disturbance storm time index (Leske et al., JGR, Vol. 106, No. A12, Pages 30,011-30,022 2001). Observations and model results also show that changes in solar wind dynamic pressure significantly modifies SEP cutoffs on a timescale of minutes well before the main phase of a storm (Kress et al., GRL, Vol. 31, L04808, 2004). In this work, we examined SEP cutoff variations due to the arrival of interplanetary shocks at the Earth's magnetosphere, and observed a characteristic pattern as a function of local-time. Increases in solar wind dynamic pressure are found to increase the cutoff near local noon and suppress the cutoff at dawn, dusk and midnight local times.
Kress Brian T.
Lee Daehee
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