Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2045m&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2045-2048
Physics
41
Ionosphere: Wave/Particle Interactions, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Auroral Ionosphere, Ionosphere: Particle Acceleration
Scientific paper
New observations from the FAST satellite demonstrate strong wave-particle interactions between energetic electrons and H+ EMIC waves in inverted-V arcs. The intense waves are shown to occur in strong upward current regions which contain intense downgoing field-aligned electron fluxes. Electrons near the inverted-V spectral peak have large, factor of 2 to 10, coherent flux modulations at or near the wave frequency. The electron modulations are typically centered at about fCH+/2, where fCH+ is the local H+ cyclotron frequency. The EMIC waves are broadbanded, extending from about 0.3fCH+ to 0.7fCH+. These waves also accelerate cold secondary electrons, forming counterstreaming field-aligned electrons at energies up to about 300 eV. In addition, electron modulations at fCH+ are observed in the density cavities associated with upgoing ion beams. Intense waves at fCH+ are simultaneously detected and shown to have a magnetic component similar to the EMIC waves.
Carlson Carl W.
Cattell Cynthia
Chaston Christopher. C.
Elphic Richard
Ergun Robert E.
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