Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23c..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM23C-08
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2778] Magnetospheric Physics / Ring Current
Scientific paper
Electromagnetic ion cyclotron (EMIC) waves in the Pc1 ultra-low frequency wave band (0.2-5Hz) observed in the plasmasphere and magnetosphere are generated by micro-scale instabilities associated with keV energetic protons of ring current origin. This case study presents a typical EMIC wave event with frequency 1.8-3.5 Hz observed by the four Cluster spacecraft when passing through perigee (L ~ 4:2) and moving northward on 2 November 2001 around 08 MLT. The event occurred around the magnetic equatorial plane within magnetic latitude range ±18 degrees with a short duration of 50 minutes. The associated cold electron density data show the wave power was confined within the narrow shell of the plasmapause where the electron density gradient decreased from 30-80 cm-3 to 20 cm-3. The radial scale size of the wave region is estimated at ~ 0:77 Re. The wave polarization was dominantly left-handed around the equatorial region and inner side of source region, but appeared right-handed close to the outer edge of the plasmapause and at higher latitudes. The Poynting flux and minimum variance analysis indicate that the wave energy was mainly transported towards high latitudes though oblique propagation was seen around the equatorial region. Enhanced H+, He+ and O+ particle energy fluxes were seen during the wave event over energy range ~25eV-40keV. Unfortunately the lower energy cold plasma composition data were not available. These observations suggest the waves originated around the equatorial region in the high density outer plasmasphere-plasmapause which overlaps the ring current; ideal conditions for wave generation by the ion cyclotron instability.
Fraser Brian J.
Liu Ya-Ying
Menk Frederick W.
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