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Conjugate observation of magnetospheric chorus propagating to the ionosphere by ducting

Shen, Yangyang; Chen, Lunjin; Zhang, Xiao‐Jia; Artemyev, Anton; Angelopoulos, Vassilis; Cully, Christopher M.; James, H. Gordon; Yau, Andrew W.; Howarth, Andrew D.; Bortnik, Jacob; Wu, Jiashu; Tian, Sheng; Hartinger, Michael D.; Connors, Martin; Horne, Richard B. ORCID: https://orcid.org/0000-0002-0412-6407. 2021 Conjugate observation of magnetospheric chorus propagating to the ionosphere by ducting. Geophysical Research Letters, 48 (23), e2021GL095933. 10, pp. https://doi.org/10.1029/2021GL095933

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Geophysical Research Letters - 2021 - Shen - Conjugate Observation of Magnetospheric Chorus Propagating to the Ionosphere.pdf - Published Version
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Abstract/Summary

Whistler-mode chorus waves are critical for driving resonant scattering and loss of radiation belt relativistic electrons into the atmosphere. The resonant energies of electrons scattered by chorus waves increase at increasingly higher magnetic latitudes. Propagation of chorus waves to middle and high latitudes is hampered by wave divergence and Landau damping but is promoted otherwise if ducted by density irregularities. Although ducting theories have been proposed since the 1960’s, no conjugate observation of ducted chorus propagation from the equatorial magnetosphere to the ionosphere has been observed so far. Here we provide such an observation, for the first time, using conjugate spacecraft measurements. Ducted chorus waves maintain significant wave power upon reaching the ionosphere, which is confirmed by ray tracing simulations. Our results suggest that ducted chorus waves may be an important driver for relativistic electron precipitation.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1029/2021GL095933
ISSN: 0094-8276
Additional Keywords: chorus waves, magnetospheric physics, wave-particle interaction, energetic electron precipitation, wave propagation, ionosphere
Date made live: 23 Nov 2021 12:06 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/531419

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