Dynamic modeling of geomagnetic cutoff for the 23-24 November 2001 solar energetic particle event

Details Dynamic modeling of geomagnetic cutoff for the 23-24 November 2001 solar energetic particle event Dynamic modeling of geomagnetic cutoff for the 23-24 November 2001 solar energetic particle event

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104808k&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04808

Physics

10

Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

We investigate numerically the time variations of geomagnetic cutoffs of solar energetic particles. As a test case, the geomagnetic cutoff of 25 MeV protons is modeled for the 23-24 November 2001 solar energetic particle (SEP) event. Following Smart and Shea [2001], solar energetic particle access is determined by computing the reverse particle trajectories. Magnetospheric fields are obtained from the Lyon-Feder-Mobarry (LFM) global MHD model, which is driven by measured solar wind parameters at the sunward boundary. We find well-defined surfaces of constant cutoff that exhibit dynamic behavior in response to solar wind conditions. We show that dynamic modeling of cutoff surfaces may be used as a tool to investigate SEP access to the inner magnetosphere. The numerical results are compared with proton observations from a highly elliptical orbit (HEO) satellite. The results suggest that an enhancement in the solar wind dynamic pressure plays a role in the observed ion injection.

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