Scattering rates of inner belt protons by EMIC waves: A comparison between test particle and diffusion simulations
Autor: | Yuri Shprits, M. de Soria-Santacruz, Ksenia Orlova, Manuel Martinez-Sanchez |
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Rok vydání: | 2013 |
Předmět: | |
Zdroj: | Geophysical Research Letters |
ISSN: | 1944-8007 0094-8276 |
Popis: | [1] Inner belt energetic protons are a hindrance to development of space technologies. The emission of electromagnetic ion cyclotron (EMIC) waves from spaceborne transmitters has been proposed as a way to solve this problem. The interaction between particles and narrowband emissions has been typically studied using nonlinear test particle simulations. We show that this formulation results in a random walk of the inner belt protons in velocity space. In this paper we compute bounce-averaged pitch angle diffusion rates from test particle simulations and compare them to those of quasi-linear theory for quasi-monochromatic EMIC waves interacting with inner belt protons. We find that the quasi-linear solution is not sensitive to the frequency bandwidth for narrow distributions. Bounce-averaged diffusion coefficients from both approaches are in good agreement for all energies and pitch angles. The interaction with inner belt protons, therefore, can be addressed using quasi-linear diffusion codes, which allows faster exploration of parameter space. |
Databáze: | OpenAIRE |
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