Fine Structure of Magnetospheric Magnetosonic Waves: 1. Elementary Rising‐Tone Emissions Within Individual Harmonic-Reference-Cited by-同舟云学术

Fine Structure of Magnetospheric Magnetosonic Waves: 1. Elementary Rising‐Tone Emissions Within Individual Harmonic

Published:2024-03 Issue:3 Volume:129 Page:
ISSN:2169-9380
Container-title:Journal of Geophysical Research: Space Physics
language:en
Short-container-title:JGR Space Physics

Author:

Li Jinxing¹^ORCID,Bortnik Jacob¹^ORCID,Tian Sheng¹^ORCID,Ma Qianli¹²^ORCID,An Xin³^ORCID,Ma Donglai¹^ORCID,Chu Xiangning⁴^ORCID,Wygant John⁵^ORCID,Kurth William S.⁶^ORCID,Hospodarsky George B.⁶^ORCID,Reeves Geoffrey D.⁷^ORCID,Funsten Herbert O.⁸^ORCID,Spence Harlan⁹^ORCID,Baker Daniel N.⁴^ORCID

Affiliation:

1. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA

2. Center for Space Physics Boston University Boston MA USA

3. Department of Earth, Planetary, and Space Sciences University of California, Los Angeles Los Angeles CA USA

4. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA

5. School of Physics and Astronomy University of Minnesota Minneapolis MN USA

6. Department of Physics and Astronomy University of Iowa Iowa City IA USA

7. Los Alamos National Laboratory Space Science and Applications Group Los Alamos NM USA

8. Los Alamos National Laboratory Los Alamos NM USA

9. Institute for the Study of Earth, Oceans, and Space University of New Hampshire Durham NH USA

Abstract

AbstractThe present study uncovers the fine structures of magnetosonic waves by investigating the EFW waveforms measured by Van Allen Probes. We show that each harmonic of the magnetosonic wave may consist of a series of elementary rising‐tone emissions, implying a nonlinear mechanism for the wave generation. By investigating an elementary rising‐tone magnetosonic wave that spans a wide frequency range, we show that the frequency sweep rate is likely proportional to the wave frequency. We studied compound rising‐tone magnetosonic waves, and found that they typically consist of multiple harmonics in the source region, and may gradually become continuous in frequency as they propagate away from source. Both elementary and compound rising‐tone magnetosonic waves last for ∼1 min which is close to the bounce period of the ring proton distribution, but their relation is not fully understood.

Funder

National Aeronautics and Space Administration

Idaho Operations Office, U.S. Department of Energy

National Science Foundation Graduate Research Fellowship Program

Johns Hopkins University

Publisher

American Geophysical Union (AGU)

Link

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2024JA032462

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