Specification of >2 MeV Geosynchronous Electrons Based on Solar Wind Measurements

Details Specification of >2 MeV Geosynchronous Electrons Based on Solar Wind Measurements Specification of >2 MeV Geosynchronous Electrons Based on Solar Wind Measurements

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm43b..07b&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM43B-07

Physics

2700 Magnetospheric Physics, 2720 Energetic Particles, Trapped, 2722 Forecasting, 2730 Magnetosphere: Inner, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Relativistic electron flux measurements from geosynchronous satellites show a local-time dependence. This local-time dependence is due to the radial profile of the electron fluxes, the dayside/nightside asymmetry of the Earth's magnetosphere and is also affected by geomagnetic activity, which is in turn affected by the solar wind. Statistical Asynchronous Regression (SAR) was recently used to determine the relationship between electron fluxes measured at different local times, as a function of the Kp index [O'Brien et al. 2001]. In this study, we use measurements directly from the solar wind, instead of the Kp index, as the basis for determining the local-time dependence of geosynchronous energetic electron fluxes. We use solar wind parameters as input in our model to map GOES-10 > 2 MeV electron measurements to other local times and compare with the electron measurements from five LANL geosynchronous satellites, widely spaced in longitude, when they pass through these local times. We explore the effects of solar wind velocity, dynamic pressure, and density on the local-time dependence of geosynchronous electron fluxes. We found that, for the given 3 year data set, only using solar wind velocity gives rise to the best results.

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