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Electromagnetic Thermal Noise in Upper-Hybrid Frequency Range
Author | Yoon, Peter; Hwang, Junga; opez, Rodrigo; Kim, Sunjung; Lee, Jaejin; |
Keywords | electromagnetic; 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 Publication | 2018 |
Journal | Journal of Geophysical Research: Space Physics |
Volume | 123835101204457272221044751983242776841205998122321002852287122242455 |
Number of Pages | 5356-5363 |
Section | |
Date Published | 07/2018 |
ISBN | |
URL | http://onlinelibrary.wiley.com/wol1/doi/10.1029/2018JA025459/fullpdf |
DOI | 10.1029/2018JA025459 |