In situ observations of magnetosonic waves modulated by background plasma density
Abstract
We report in situ observations by the Van Allen Probe mission that magnetosonic (MS) waves are clearly relevant to the background plasma number density. As the satellite moved across dense and tenuous plasma alternatively, MS waves occurred only in lower density region. As the observed protons with “ring” distributions provide free energy, local linear growth rates are calculated and show that magnetosonic waves can be locally excited in tenuous plasma. With variations of the background plasma density, the temporal variations of local wave growth rates calculated with the observed proton ring distributions show a remarkable agreement with those of the observed wave amplitude. Therefore, the paper provides a direct proof that background plasma densities can modulate the amplitudes of magnetosonic waves through controlling the wave growth rates.
- Authors:
-
[1];
[1];
[1];
[2]
- Wuhan Univ. (China). School of Electronic Information
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1469538
- Report Number(s):
- LA-UR-17-26244
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 44; Journal Issue: 15; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Astronomy and Astrophysics
Citation Formats
Yuan, Zhigang, Yu, Xiongdong, Huang, Shiyong, Wang, Dedong, and Funsten, Herbert O. In situ observations of magnetosonic waves modulated by background plasma density. United States: N. p., 2017.
Web. doi:10.1002/2017GL074681.
Yuan, Zhigang, Yu, Xiongdong, Huang, Shiyong, Wang, Dedong, & Funsten, Herbert O. In situ observations of magnetosonic waves modulated by background plasma density. United States. https://doi.org/10.1002/2017GL074681
Yuan, Zhigang, Yu, Xiongdong, Huang, Shiyong, Wang, Dedong, and Funsten, Herbert O. Sat .
"In situ observations of magnetosonic waves modulated by background plasma density". United States. https://doi.org/10.1002/2017GL074681. https://www.osti.gov/servlets/purl/1469538.
@article{osti_1469538,
title = {In situ observations of magnetosonic waves modulated by background plasma density},
author = {Yuan, Zhigang and Yu, Xiongdong and Huang, Shiyong and Wang, Dedong and Funsten, Herbert O.},
abstractNote = {We report in situ observations by the Van Allen Probe mission that magnetosonic (MS) waves are clearly relevant to the background plasma number density. As the satellite moved across dense and tenuous plasma alternatively, MS waves occurred only in lower density region. As the observed protons with “ring” distributions provide free energy, local linear growth rates are calculated and show that magnetosonic waves can be locally excited in tenuous plasma. With variations of the background plasma density, the temporal variations of local wave growth rates calculated with the observed proton ring distributions show a remarkable agreement with those of the observed wave amplitude. Therefore, the paper provides a direct proof that background plasma densities can modulate the amplitudes of magnetosonic waves through controlling the wave growth rates.},
doi = {10.1002/2017GL074681},
journal = {Geophysical Research Letters},
number = 15,
volume = 44,
place = {United States},
year = {Sat Aug 12 00:00:00 EDT 2017},
month = {Sat Aug 12 00:00:00 EDT 2017}
}
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