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- Title
Statistical Analysis of Transverse Size of Lower Band Chorus Waves Using Simultaneous Multisatellite Observations.
- Authors
Shen, Xiao‐Chen; Li, Wen; Ma, Qianli; Agapitov, Oleksiy; Nishimura, Yukitoshi
- Abstract
Chorus waves are known to accelerate or scatter energetic electrons via quasi‐linear or nonlinear wave‐particle interactions in the Earth's magnetosphere. In this letter, by taking advantage of simultaneous observations of chorus waveforms from at least a pair of probes among Van Allen Probes and/or Time History of Events and Macroscale Interactions during Substorms (THEMIS) missions, we statistically calculate the transverse size of lower band chorus wave elements. The average size of lower band chorus wave element is found to be ~315±32 km over L shells of ~5–6. Furthermore, our results suggest that the scale size of lower band chorus tends to be (1) larger at higher L shells; (2) larger at higher magnetic latitudes, especially on the dayside; and (3) larger in the azimuthal direction than in the radial direction. Our findings are crucial to quantify wave‐particle interaction process, particularly the nonlinear interactions between chorus and energetic electrons. Plain Language Summary: Chorus waves are known to play an important role in controlling energetic electron dynamics in the Earth's magnetosphere. The spatial scale of chorus waves is one of the most important parameters that determine the wave‐particle interaction process and thus is critical for understanding the role of chorus waves in radiation belt dynamics. By applying simultaneous in situ waveform observations from multiple satellites, we statistically calculate the scale size of chorus wave elements, which is found to be ~315±32 (95% confidence interval) km on average. More specifically, we find that the scale size tends to be larger at higher L shells, at higher magnetic latitudes, and in the azimuthal direction than in the radial direction. Our findings are crucial for understanding and modeling wave‐particle interactions driven by chorus waves. Key Points: The average scale size of lower band chorus element is ~315±32 km at L shells over ~5–6Transverse scale size of chorus is larger at higher L shells and larger at higher latitudes, especially on the daysideTransverse scale size of chorus is larger in the azimuthal direction than in the radial direction
- Subjects
QUANTITATIVE research; ELECTRONS; WAVE analysis; MAGNETOSPHERE; AZIMUTHAL projection (Cartography)
- Publication
Geophysical Research Letters, 2019, Vol 46, Issue 11, p5725
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2019GL083118