Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21d..05u&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM21D-05
Physics
[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2778] Magnetospheric Physics / Ring Current
Scientific paper
Electromagnetic Ion Cyclotron (EMIC) waves are believed to play an important role in the dynamics of energetic particles (both electrons and ions) trapped by the Earth's magnetic field causing them to precipitate into the ionosphere via resonant interaction. In order to incorporate the EMIC-related loss processes into global magnetospheric models one needs to know solar wind and magnetospheric conditions favourable for EMIC wave excitation as well as the localization of the waves in the magnetosphere. EMIC waves are generated by anisotropic (T\bot }/T{||> 1) ion distributions. Generally, any process that leads to the formation of such distributions may be responsible for EMIC wave initiation. We will discuss magnetospheric compression as a new principal source of EMIC wave generation in the inner dayside magnetosphere. First, we will show examples of EMIC wave observation in the inner dayside magnetosphere during periods of enhanced solar wind dynamic pressure and associated dayside magnetospheric compression [see e.g., Usanova et al., 2008, 2010]. Our observations show that the compression-related EMIC wave activity usually lasts for several hours while the magnetosphere remains compressed. Further, we will present results of test particle simulations of energetic ion dynamics in a compressed magnetosphere. Our simulations confirm that anisotropic ion distributions are generated in the compressed dayside magnetosphere, the anisotropy being dependant on the strength of magnetospheric compression. We will show that in the inner magnetosphere these anisotropic particle distributions can be formed due to particle drift shell-splitting in an asymmetric magnetic field, the degree of anisotropy being sufficient to produce EMIC waves like those detected.
Mann Ian R.
Sydora Richard D.
Usanova M.
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