Generation of Electrostatic Cyclotron Harmonic (ECH) Waves due to Loss Cone Distribution Functions

Details Generation of Electrostatic Cyclotron Harmonic (ECH) Waves due to Loss Cone Distribution Functions Generation of Electrostatic Cyclotron Harmonic (ECH) Waves due to Loss Cone Distribution Functions

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm22a..08u&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM22A-08

Physics

7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 7871 Waves And Instabilities, 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities

Scientific paper

Electron cyclotron harmonic (ECH) waves are observed in the Earth's magnetosphere in the nightside near-Earth equatorial region. Observations indicate that a loss cone feature in the electron distribution function generates ECH waves, which result in pitch angle diffusion and the formation of a highly anisotropic "pancake" type of distribution in the low energy electron population. Electrostatic and electromagnetic waves are driven by loss cone distributions in the presence of cold plasma, which is known to strongly affect the linear dispersion properties of ECH waves. To examine the detailed properties of the ECH waves and ensuing wave-particle interactions, two-dimensional (2.5D) electromagnetic Particle-In-Cell (PIC) and Vlasov simulations are employed. The heating of the cold electrons and their effects on the saturation of the ECH waves will be determined. Implications for diffuse auroral precipitation will be discussed.

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