O-Mode Instability for Non-Thermal Continuum Radiation Generated Near the Plasmapause

Cheng, Chio Z.; Kim, Eun‐Hwa; Boardsen, Scott A.; Cairns, Iver H.; Johnson, Jay R.

doi:10.1029/2024ja032626

Title: O-Mode Instability for Non-Thermal Continuum Radiation Generated Near the Plasmapause

Journal Article · 05 October 2024 · Journal of Geophysical Research. Space Physics

DOI: https://doi.org/10.1029/2024ja032626 · OSTI ID:2466192

Cheng, Chio Z. ^[1];

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Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Andrews University, Berrien Springs, MI (Untied States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); University of Maryland, Baltimore, MD (United States)
Univ. of Sydney, NSW (Australia)
Andrews University, Berrien Springs, MI (Untied States)

Analysis of the ordinary mode (O-mode) instability is performed to comprehend the nonthermal continuum (NTC) radiation near the plasmapause, taking into account the relativistic wave-electron resonance effect. The energy source is the anisotropy in the velocity of the minority suprathermal electron population. Numerical solutions demonstrate that the O-mode can be unstable with multiple narrow frequency bands located close to harmonics of the electron cyclotron frequency above the local electron plasma frequency. These waves have narrow beaming angle bands of nearly 90° relative to the ambient magnetic field. Our findings indicate that NTC radiation generated by this wave-electron resonance instability near the plasmapause can propagate nearer to the magnetic equator with multiple harmonics, which is in agreement with a recent statistical study using Van Allen Probes.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Australian Research Council (ARC)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2466192

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 10 Vol. 129; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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