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Electromagnetic Thermal Noise in Upper-Hybrid Frequency Range



AuthorYoon, Peter; Hwang, Junga; opez, Rodrigo; Kim, Sunjung; Lee, Jaejin;
Keywordselectromagnetic; parker solar probe; Solar Probe Plus; thermal noise; upper hybrid
Abstract

The inner magnetosphere including the radiation belt and ring current environment is replete with high-frequency fluctuations with peak intensity occurring near upper-hybrid frequency and/or multiple harmonic electron cyclotron frequencies above and below the upper-hybrid frequency. Past and contemporary spacecraft missions, including the Van Allen Probes, were designed to detect the electric field spectrum only for these high-frequency fluctuations. Making use of the recently formulated generalized theory of electromagnetic spontaneous emission in thermal magnetized plasmas, it is shown that upper-hybrid/multiple harmonic electron cyclotron emissions are characterized by a significant magnetic field component, even in the high-frequency regime. Such a prediction may potentially be tested by upcoming spacecraft missions including the Solar Probe Orbiter and Parker Solar Probe. The present finding may also have a potentially significant ramification for the broader astrophysical contexts.

Year of Publication2018
JournalJournal of Geophysical Research: Space Physics
Volume123835101204457272221044751983242776841205998122321002852287122242455
Number of Pages5356-5363
Section
Date Published07/2018
ISBN
URLhttp://onlinelibrary.wiley.com/wol1/doi/10.1029/2018JA025459/fullpdf
DOI10.1029/2018JA025459