Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm41b..05c&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SM41B-05
Physics
2700 Magnetospheric Physics, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2788 Storms And Substorms
Scientific paper
What physics processes govern the behavior of relativistic electrons in the Earth's radiation belts in geomagnetic storm times is of keen interest to the space weather community. To address this question, two magnetic storms, during October 21-23, 2001 and September 4-9, 2002, have been selected for a thorough data and model study by the Geospace Environment Modeling (GEM) program as part of the Inner Magnetosphere/Storm (IMS) assessment challenge. This study will conduct a survey of the temporal evolving phase space density (PSD) distribution of relativistic electrons at fixed phase space coordinates in the two storms. Data used in this work include pitch-angle resolved electron and magnetic field measurements from multiple spacecraft, which are the LANL geosynchronous satellites, GOES satellites, POLAR and CLUSTER. With orbits going through all key inner magnetospheric areas, those satellites form a constellation which provides simultaneous measurements at multiple locations so that spatial factor can be easily separated from temporal one. Additionally, the fact that detected electrons have a wide range of adiabatic invariants, covering both equatorial and off-equatorial regions throughout L*~2-9, allows tracing a specified electron population across the adiabatic phase space. To provide the highest fidelity, the errors in the PSD calculation are constrained by employing the Liouville's Theorem to check the reliabilities of the calibrations and optimize the dynamic magnetic field model. This work will establish the PSD distribution map as a function of both universal time and local time, which can be compared later with model output and serve as the reference of differentiating physics mechanisms associated with acceleration, transport and loss of relativistic electron during storm phases.
Chen Yafeng
Friedel Reiner
Reeves Galen
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