Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51a0508r&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM51A-0508
Physics
2471 Plasma Waves And Instabilities, 2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped
Scientific paper
The diffuse electron auroral precipitation is generally thought to be caused by the pitch angle diffusion of magnetospheric electrons into the atmospheric loss cone by plasma waves. But there has been some controversy concerning which plasma wave mode is responsible for the diffusion and whether the observed wave amplitudes are large enough to account for the observed levels of precipitation. The two primary candidate wave modes are whistler-mode chorus and electrostatic electron cyclotron harmonic waves. Some previous studies have concluded that the observed waves are too weak to account for the diffuse precipitation [Belmont et al., 1983; Roeder and Koons, 1989]. Recent analysis of CRRES measurements showed that the waves within four hours of a substorm particle injection may be strong enough to cause the precipitation [Meredith et al. 2000]. Chorus emissions have also been cited as a possible energy source for the acceleration of electrons to relativistic energies in the inner magnetosphere. The plasma wave observations by the AMPTE/IRM and SCATHA satellites are used to obtain statistical estimates of the wave amplitudes for these emission modes during substorm events. These results are compared against the Meredith et al. [2000] conclusions. The effects of the observed waves for electron precipitation and energization are then assessed using several model calculations of quasilinear diffusion rates.
Fennell Joseph F.
Koons Harry C.
Roeder James L.
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