Physics – Plasma Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709104p&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 9, CiteID L09104
Physics
Plasma Physics
5
Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Space Plasma Physics: Nonlinear Phenomena (4400, 6944)
Scientific paper
The Cluster spacecraft were favorably positioned on the nightside near the equatorial plasmapause of Earth at L ˜ 4.3 on 30 March 2002 to observe electromagnetic ion cyclotron (EMIC) rising tone emissions in association with Pc1 waves at 1.5 Hz. The EMIC rising tone emissions were found to be left-hand, circularly polarized, dispersive, and propagating away from the equator. Their burstiness and dispersion of ˜30s/Hz rising out of the 1.5 Hz Pc1 waves are consistent with their identification as EMIC triggered chorus emissions, the first to be reported through in situ observations near the plasmapause. Along with the expected H+ ring current ions seen at higher energies (>300 eV), lower energy ions (300 eV and less) were observed during the most intense EMIC triggered emission events. Nonlinear wave-particle interactions via cyclotron resonance between the ˜2-10 keV H+ ions with temperature anisotropy and the linearly-amplified Pc1 waves are suggested as a possible generation mechanism for the EMIC triggered emissions.
Adrian Mark L.
Constantinescu Dana
Cornilleau-Wehrlin Nicole
Dandouras Iannis
Décréau Pierrette M. E.
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