EMIC wave generation and associated loss of energetic particles during magnetospheric compressions.

Details EMIC wave generation and associated loss of energetic particles during magnetospheric compressions. EMIC wave generation and associated loss of energetic particles during magnetospheric compressions.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm72a..05u&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM72A-05

Physics

2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471), 2778 Ring Current

Scientific paper

Electromagnetic ion cyclotron (EMIC) waves are believed to play an important role in the dynamics of energetic particles in the inner magnetosphere, 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 favorable for EMIC wave excitation as well as localization of the waves in the magnetosphere. In this work, we investigate the role of magnetospheric compression in the generation of EMIC waves in the inner magnetosphere. Theoretical studies have shown that in the inner magnetosphere resonant interaction with EMIC waves may be important for MeV electron loss from the radiation belts, especially in regions of high plasma density and low magnetic field, e.g., outer regions of quiet- time plasmasphere. We will present multiple examples of EMIC wave observation - both ground-based and in- situ and simultaneous registration of energetic proton precipitation into the ionosphere. Such precipitations were previously found to be co-located with those of relativistic electrons. Based on our observations, we will discuss the following possibility for the inner magnetosphere loss processes: enhancements in solar wind density -> magnetospheric compression -> generation of EMIC waves in regions of high plasma density - > consequent loss of energetic particles.

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