TitleElectromagnetic Thermal Noise in Upper-Hybrid Frequency Range
Publication TypeJournal Article
Year of Publication2018
AuthorsYoon, PH, Hwang, J, ópez, RA, Kim, S, Lee, J
JournalJournal of Geophysical Research: Space Physics
Pagination5356 - 5363
Date Published07/2018
Keywordselectromagnetic; parker solar probe; Solar Probe Plus; thermal noise; upper hybrid

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.

Short TitleJ. Geophys. Res. Space Physics

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