On the Wave-Normal Distribution of Lightning-Generated Whistlers and Their Propagation Modes

Xia, Zhiyang; Chen, Lunjin; Horne, Richard B. ORCID: https://orcid.org/0000-0002-0412-6407; Liu, Xu; Bortnik, Jacob. 2024 On the Wave-Normal Distribution of Lightning-Generated Whistlers and Their Propagation Modes. Journal of Geophysical Research: Space Physics, 129 (4), e2023JA032353. 12, pp. https://doi.org/10.1029/2023JA032353

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Abstract/Summary

Observations from Van Allen Probes are analyzed to obtain the statistical wave normal distribution of lightning-generated whistlers (LGWs). An automatic algorithm is developed to identify burst mode waveform data with LGW signals and analyze the wave polarization information for these LGW signals. The spatial distribution of the LGW occurrence and the probabilities of different propagation types demonstrate that most LGWs can be observed in the low L-shell region (L < 3), where the dominant propagation type is oblique outward. Parallel propagation dominates in the high L-shell region, but the LGW occurrence is very small. Additionally, a small group of oblique but inwardly propagating LGWs are observed at low altitudes (<0.2RE). A ray tracing simulation is performed not only to confirm predominant oblique and outward wave vectors in the vast region of the plasmasphere but also to verify the existence of these inward propagating LGW signals at low altitudes near the topside ionosphere.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2023JA032353
ISSN:	2169-9380
Additional Keywords:	lightning-generated whistlers; VLF waves; inner magnetosphere; wave propagation; ray tracing
Date made live:	04 Apr 2024 09:25 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537217

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