Dipole Tilt Effects on Radiation Belt Electrons and Dst Index

Details Dipole Tilt Effects on Radiation Belt Electrons and Dst Index Dipole Tilt Effects on Radiation Belt Electrons and Dst Index

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22b..08l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22B-08

Physics

2720 Energetic Particles, Trapped, 2722 Forecasting, 2730 Magnetosphere: Inner, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

Long term measurements of MeV electrons by the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) and also by LANL sensors at geostationary orbit clearly show seasonal variations: enhanced electron fluxes occur around the equinoxes. The same variation can be seen for geomagnetic activity such as the Dst index. Recently developed models for predicting MeV electron at geostationary orbit [Li et al., 2001] and the Dst index [Temerin and Li, 2002] based on solar wind measurements are used to examine the cause of the prominent semiannual variations of outer belt electrons and the Dst index. We found that the equinoctial effect (the angle between the Earth's dipole and the flow direction of the solar wind) contributes most to the semiannual variation of the Dst and MeV electrons deep in the inner magnetosphere (L<5). The semiannual variation of MeV electrons at geostationary orbit (1995-2000) is attributed mostly to the semiannual variation of solar wind velocity itself. [Li et al., 2001] Li, X., M. Temerin, D. N. Baker, G. D. Reeves, and D. Larson, Quantitative Prediction of Radiation Belt Electrons at Geostationary Orbit Based on Solar Wind Measurements, Geophysical Research Lett., Vol. 28, 1887, 2001. [Temerin and Li, 2002] Temerin, M., and X. Li, A New Model for the Prediction of Dst on the Basis of the Solar Wind, J. of Geophysical Research, in press, 2002.

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