Statistical Properties of Low Frequency Plasmaspheric Hiss

TitleStatistical Properties of Low Frequency Plasmaspheric Hiss
Publication TypeJournal Article
Year of Publication2017
AuthorsMalaspina, DM, Jaynes, AN, Hospodarsky, G, Bortnik, J, Ergun, RE, Wygant, J
JournalJournal of Geophysical Research: Space Physics
Date Published07/2017
Keywordsinner magnetosphere; plasma waves; Plasmaspheric Hiss; Van Allen Probes; Wave Statistics
AbstractPlasmaspheric hiss is an important wave mode for the dynamics of inner terrestrial magnetosphere plasma populations. It acts to scatter high energy electrons out of trapped orbits about Earth and into the atmosphere, defining the inner edge of the radiation belts over a range of energies. A low-frequency component of hiss was recently identified and is important for its ability to interact with higher energy electrons compared to typically considered hiss frequencies. This study compares the statistical properties of low and high frequency plasmaspheric hiss in the terrestrial magnetosphere, demonstrating that they are statistically distinct wave populations. Low frequency hiss shows different behavior in frequency space, different spatial localization (in magnetic local time and radial distance), and different amplitude distributions compared to high frequency hiss. The observed statistical properties of low frequency hiss are found to be consistent with recently developed theories for low frequency hiss generation. The results presented here suggest that careful consideration of low frequency hiss properties can be important for accurate inclusion of this wave population in predictive models of inner magnetosphere plasma dynamics.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA024328/full
DOI10.1002/2017JA024328
Short TitleJ. Geophys. Res. Space Physics


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