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

Journal Article · · Journal of Geophysical Research. Space Physics
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [4]
  1. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
  2. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA, 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
+ Show Author Affiliations

Abstract The 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0010578
OSTI ID:
2328162
Alternate ID(s):
OSTI ID: 2328164
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 3 Vol. 129; ISSN 2169-9380
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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