Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42c08b&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM42C-08
Other
1
2716 Energetic Particles, Precipitating, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
Long-term studies of energetic electron fluxes in the Earth's magnetosphere have revealed many of the electron temporal occurrence characteristics and their relationships to solar wind drivers. Magnetospheric substorms are widely understood to accelerate electrons (and ions) up to energies of tens to hundreds of keV on short time scales (minutes). This impulsive acceleration and ``injection'' of energetic particles into the outer trapping regions of the magnetosphere is often used as a good measure of substorm onset timing. The injected energetic particles have been used for decades as a probe of magnetospheric structure and dynamics during substorms. In more recent times, it has become clear that substorm-generated energetic electrons play another key role in magnetospheric processes, viz., to provide a ``seed'' population of electrons which is subsequently accelerated to highly relativistic energies (1-10 MeV). New data from the remarkable constellation of spacecraft presently in near-Earth orbits are giving us new insights into the essential role that substorms play in the subset of geomagnetic storms that generate relativistic electrons. Thus, this aspect of magnetospheric dynamics and coupling is a central part of the ongoing storm-substorm discussion.
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