Substorm Driven Chorus Waves: Decay Timescales and Implications for Pulsating Aurora

Troyer, Riley N.; Jaynes, Allison N.; Hartley, David P.; Meredith, Nigel P.; Hua, Man; Bortnik, Jacob

doi:10.1029/2023JA031883

Substorm Driven Chorus Waves: Decay Timescales and Implications for Pulsating Aurora

Journal Article · Sat Jan 06 23:00:00 EST 2024 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1029/2023JA031883· OSTI ID:2279076

^[1]; ^[1]; ^[1]; ^[2]; Hua, Man ^[3]; ^[3]

Department of Physics and Astronomy University of Iowa Iowa City IA USA
British Antarctic Survey Natural Environment Research Council Cambridge UK
University of California, Los Angeles Los Angeles CA USA

Abstract

Energetic electron precipitation (EEP) associated with pulsating aurora can transfer greater than 30 keV electrons from the outer radiation belt region into the upper atmosphere and can deplete atmospheric ozone via collisions that produce NOx and HOx molecules. Our knowledge of exactly how EEP occurs is incomplete. Previous studies have shown that pitch angle scattering between electrons and lower‐band chorus waves can cause pulsating aurora associated with EEP and that substorms play an important role. In this work, we quantify the timescale of chorus wave decay following substorms and compare that to previously determined timescales. We find that the chorus decay e‐folding time varies based on magnetic local time (MLT), magnetic latitude, and wave frequency. The shortest timescales occur for lower‐band chorus in the 21 to 9 MLT region and compares, within uncertainty, to the energetic pulsating aurora timescale of Troyer et al. (2022, https://doi.org/10.3389/fspas.2022.1032552 ) for energetic pulsating aurora. We are able to further support this connection by modeling our findings in a quasi‐linear diffusion simulation. These results provide observations of how chorus waves behave after substorms and add additional statistical evidence linking energetic pulsating aurora to substorm driven lower‐band chorus waves.

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Sponsoring Organization:: USDOE

OSTI ID:: 2279076

Alternate ID(s):: OSTI ID: 2279078

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 1 Vol. 129; ISSN 2169-9380

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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