2013 Radiation Belts Workshop: Comprehending, Specifying and Forecasting their Dynamics

Effect of plasma density on diffusion rates for wave particle interactions with chorus, plasmaspheric hiss and EMIC waves: Extreme event analysis.

3 Jul 2013, 15:10

20m

Island of Santorini, Greece (http://en.wikipedia.org/wiki/Santorini)

Oral Waves, Wave-Particle Interactions and Radiation Belt Dynamics Wave, Wave-Particle Interactions and RB Dynamics

Speaker

Mrs Angélica SICARD-PIET (ONERA)

Description

Wave particle interactions, which play a major role in electron radiation belts dynamics, are controlled by two main parameters: the characteristics of the wave (such as the wave type, its power spectrum and wave normal angle) and the characteristics of the ambient plasma. The purpose of this study is to assess how variations in the plasma density affect diffusion rates for chorus, plasmaspheric hiss and EMIC waves. First, we compare electron plasma densities derived from in-situ measurements (CRRES, THEMIS and CLUSTER) with existing models (Carpenter and GCPM). Then, the electron plasma density measured by CRRES is studied in detail and percentiles of the distribution are calculated for several values of L*. Finally, pitch angle and energy diffusion rates are calculated using the results of the analysis of the CRRES electron plasma density for several energies using typical wave parameters for chorus, plasmaspheric hiss and EMIC waves.