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Scattering rates of inner belt protons by EMIC waves: A comparison between test particle and diffusion simulations


Authorde Soria-Santacruz, M.; Orlova, K.; Martinez-Sanchez, M.; Shprits, Y;
KeywordsEMIC; inner belt; wave-particle interactions
AbstractInner 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.
Year of Publication2013
JournalGeophysical Research Letters
Volume40
Number of Pages4793\textendash4797
Section
Date Published09/2013
ISBN
URLhttp://doi.wiley.com/10.1002/grl.50925
DOI10.1002/grl.50925