Large amplitude electric and magnetic field signatures in the inner magnetosphere during injection of 15 MeV electron drift echoes

Details Large amplitude electric and magnetic field signatures in the inner magnetosphere during injection of 15 MeV electron drift echoes Large amplitude electric and magnetic field signatures in the inner magnetosphere during injection of 15 MeV electron drift echoes

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1739w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 16, p. 1739-1742

Computer Science

Sound

25

Earth Magnetosphere, Echoes, Electric Fields, Electron Plasma, Magnetic Signatures, Planetary Magnetic Fields, Plasma Drift, Satellite Sounding, Sudden Storm Commencements, Crres (Satellite), Injection, Shock Wave Interaction

Scientific paper

Electric and magnetic fields were measured by the Combined Release and Radiation Effects Satellite (CRRES) at an L-value of 2.2 to 2.6 near 0300 magnetic local time during a strong storm sudden commencement (SSC) on March 24, 1991. The electric field signature at the spacecraft at the time of the SSC was characterized by a large amplitude oscillation (80 mV/m peak to peak) with a period corresponding to the 150 second drift echo period of the simultaneously observed 15 MeV electrons. Considerations of previous statistical studies of the magnitude of SSC electric and magnetic fields versus local time and analysis of the energization and cross-L transport of the particles imply the existence of 200 to 300 mV/m electric fields over much of the dayside magnetosphere. These observations also suggest that the 15 MeV drift echo electrons were selectively energized because their gradient drift velocity allowed them to reside in the region of strong electric fields for the duration of the accelerating phase of the electric field.

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