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Fine structure of plasmaspheric hiss



AuthorSummers, Danny; Omura, Yoshiharu; Nakamura, Satoko; Kletzing, Craig;
KeywordsPlasmaspheric Hiss; Van Allen Probes; whistler mode waves
AbstractPlasmaspheric hiss has been widely regarded as a broadband, structureless, incoherent emission. In this study, by examining burst-mode vector waveform data from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) instrument on the Van Allen Probes mission, we show that plasmaspheric hiss is a coherent emission with complex fine structure. Specifically, plasmaspheric hiss appears as discrete rising tone and falling tone elements. Our study comprises the analysis of two one-hour samples within which a total of 8 one-second samples were analyzed. By means of waveform analysis on two samples we identify typical amplitudes, phase profiles, and sweep rates of the rising and falling tone elements. The exciting new observations reported here can be expected to fuel a re-examination of the properties of plasmaspheric hiss, including a further re-analysis of the generation mechanism for hiss.
Year of Publication2014
JournalJournal of Geophysical Research: Space Physics
Volume
Number of Pages
Section
Date Published12/2014
ISBN
URLhttp://doi.wiley.com/10.1002/2014JA020437
DOI10.1002/2014JA020437