In situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions
Journal Article
·
· Journal of Geophysical Research. Space Physics
- Wuhan Univ. (China). School of Electronic Information
- Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
With observations of the Van Allen Probe B, we report in situ evidence of the modification of the parallel propagating electromagnetic ion cyclotron (EMIC) waves by heated He+ ions. In the outer boundary of the plasmasphere, accompanied with the He+ ion heating, the frequency bands of H+ and He+ for EMIC waves merged into each other, leading to the disappearance of a usual stop band between the gyrofrequency of He+ ions (ΩHe+) and the H+ cutoff frequency (ωH+co) in the cold plasma. Moreover, the dispersion relation for EMIC waves theoretically calculated with the observed plasma parameters also demonstrates that EMIC waves can indeed parallel propagate across ΩHe+. Therefore, this work provides an in situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NSFC); USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1473808
- Report Number(s):
- LA-UR--17-29397
- Journal Information:
- Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 7 Vol. 121; ISSN 2169-9380
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | February 2018 |
Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study
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journal | November 2019 |
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