Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm42a..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM42A-03
Physics
2720 Energetic Particles: Trapped, 2731 Magnetosphere: Outer, 2772 Plasma Waves And Instabilities (2471)
Scientific paper
Chorus is an intense whistler-mode wave that permeates the low-density region between the plasmapause and the magnetopause and can be observed on the ground over a range of latitudes. The waves are believed to be generated through the electron cyclotron instability by anisotropic distributions of energetic electrons in the range of 5 to 150 keV. In the inner and middle magnetosphere (L ~eq 4 to 8), the onset of wave generation has been well associated with substorm electron injections. However, there also exists a population of waves in the outer dayside region within a few RE of the magnetopause, the source of which is less well understood. We examine chorus activity from a high invariant latitude ground station (AGO P2, Λ=-69.8) for the first 100 days in 2007 and explore the variability of wave occurrence in terms of solar wind and magnetospheric drivers. We find that when the station is in the dawn local time sector (MLT<10), the onset of waves is clearly linked to substorm injections. However, as the station rotates to noon, wave occurrence favors geomagnetically quiet periods. We interpret our findings in terms of previous spacecraft observations of waves and energetic particles as well as theoretical predictions for drift shell bifurcation near the dayside magnetopause.
Inan Umran S.
Petrinec Steven M.
Spasojevic Maria
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