Structure of the outer zone of the electron radiation belt

Details Structure of the outer zone of the electron radiation belt Structure of the outer zone of the electron radiation belt

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm52a..08v&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM52A-08

Other

2720 Energetic Particles, Trapped, 2722 Forecasting, 3220 Nonlinear Dynamics

Scientific paper

Earlier solar wind-magnetosphere coupling studies tell us that the MeV electron population in the outer zone responds to the solar wind speed VSW, IMF Bz, and Btot. The most geoeffective profiles of these quantities are associated with high-speed streams and magnetic clouds. What is less known is that different L shell regions of the inner magnetosphere respond to very different, sometimes diametrically so, interplanetary conditions. Using the response to the solar wind driving we identify four regions: L=1-2, 2-3 (slot), 3-4 (P0, responding to shock- and cloud-like solar wind), 4-7 (P1, responding to high-speed stream conditions), and 7-15 (P2, responding to dVSW/dt<0 and IMF Bz>0). We find that a) omnidirectional fluxes in a given L shell are strongly correlated with fluxes in the same region, but much less so with fluxes in other regions, giving further support to the hypothesis of magnetospheric coherence. b) The boundaries between regions (especially between P1 and P2 which determines overall trapping capacity) vary with the solar cycle and season. c) The response in each region increases with activity level, but each region has a different rate of increase. d) The P2 region is characterized by lower fluxes (typically >2 orders of magnitude below P1) organized in a fine structure of long-lived (days-weeks-long), narrow (DeltaL=0.1-0.3) regions with generally different dynamics than P0 or P1. The most prominent of these thin regions are located at L=9.4 and 7.5. These effects were studied with particle flux data obtained by SAMPEX and EXOS-C (OHZORA) and solar wind data from the OMNIweb database.

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