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Automated Identification and Shape Analysis of Chorus Elements in the Van Allen Radiation Belts


AuthorGupta, Ananya; Kletzing, Craig; Howk, Robin; Kurth, William; Matheny, Morgan;
KeywordsChorus; Van Allen Probes; Van Allen radiation belt
AbstractAn important goal of the Van Allen Probes mission is to understand wave-particle interaction by chorus emissions in terrestrial Van Allen radiation belts. To test models, statistical characterization of chorus properties, such as amplitude variation and sweep rates, is an important scientific goal. The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instrumentation suite provides measurements of wave electric and magnetic fields as well as DC magnetic fields for the Van Allen Probes mission. However, manual inspection across terabytes of EMFISIS data is not feasible and as such introduces human confirmation bias. We present signal processing techniques for automated identification, shape analysis, and sweep rate characterization of high-amplitude whistler-mode chorus elements in the Van Allen radiation belts. Specifically, we develop signal processing techniques based on the radon transform that disambiguate chorus elements with a dominant sweep rate against hiss-like chorus. We present representative results validating our techniques and also provide statistical characterization of detected chorus elements across a case study of a 6 s epoch.
Year of Publication2017
JournalJournal of Geophysical Research: Space Physics
Volume
Number of Pages
Section
Date Published12/2017
ISBN
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA023949/full
DOI10.1002/2017JA023949