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Electromagnetic Thermal Noise in Upper‐Hybrid Frequency Range
Author(s) -
Yoon Peter H.,
Hwang Junga,
López Rodrigo A.,
Kim Sunjung,
Lee Jaejin
Publication year - 2018
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2018ja025459
Subject(s) - physics , cyclotron , magnetosphere , lower hybrid oscillation , computational physics , spacecraft , van allen probes , harmonic , harmonics , electron , magnetic field , orbiter , noise (video) , plasmasphere , range (aeronautics) , plasma , van allen radiation belt , aerospace engineering , astronomy , acoustics , nuclear physics , quantum mechanics , voltage , artificial intelligence , computer science , image (mathematics) , engineering
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.