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- Title
In Situ Observations of Whistler-Mode Chorus Waves Guided by Density Ducts.
- Authors
Rui Chen; Xinliang Gao; Quanming Lu; Lunjin Chen; Tsurutani, Bruce T.; Wen Li; Binbin Ni; Shui Wang
- Abstract
In this paper, we report the proof of the existence of density ducts in the Earth's magnetosphere by studying in situ observations of whistler-mode chorus waves using NASA's Van Allen Probe-A data. Chorus waves, originally excited inside the density ducts with wave normal angles (WNAs) smaller than the Gendrin angle at the near-equatorial region, are efficiently confined to a limited area inside density ducts (i.e., ducted regions), and remain with small WNAs as they propagate toward higher latitudes. The ducted region becomes narrower for the higher-frequency waves. Chorus waves with WNAs larger than the Gendrin angle are not guided by density ducts. Our study reveals that density ducts can effectively control the property and distribution of chorus waves, and may ultimately regulate electron dynamics in the Earth's or other planetary radiation belts.
- Subjects
UNITED States. National Aeronautics &; Space Administration; METEOROLOGICAL satellites; ATMOSPHERIC waves; ATMOSPHERIC circulation; SOLAR radiation
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 4, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2020JA028814