University of Oulu

Tian, X., Yu, Y., Gong, F., Ma, L., Cao, J., Solomon, S. C., et al. (2023). Ionospheric modulation by EMIC wave-driven proton precipitation: Observations and simulations. Journal of Geophysical Research: Space Physics, 128, e2022JA030983.

Ionospheric modulation by EMIC wave-driven proton precipitation : observations and simulations

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Author: Tian, Xingbin1,2; Yu, Yiqun1,2; Gong, Fan1,2;
Organizations: 1School of Space and Environment, Beihang University, Beijing, China
2Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology, Beijing, China
3National Center for Atmospheric Research, High Altitude Observatory, Boulder, CO, USA
4Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
5National Institute of Polar Research, Tachikawa, Japan
6Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.6 MB)
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Language: English
Published: American Geophysical Union, 2023
Publish Date: 2023-04-27


Protons of tens of keV can be resonantly scattered by electromagnetic ion cyclotron (EMIC) waves excited in the magnetosphere, resulting in proton precipitation down to the upper atmosphere. In this study, we report for the first time the ionospheric height-dependent ionization in response to EMIC-associated isolated proton aurora (IPA) using simultaneous space-borne and ground-based measurements. On 06 March 2019, the Polar Orbiting Environmental Satellites observed significant proton precipitation in the dusk sector (MLT ∼ 19), while ground-based magnetometers detected a clear signature of EMIC waves. Meanwhile, the conjugated all sky imager captured an IPA and the nearby Poker Flat incoherent scatter radar (PFISR) showed enhanced electron density in the E region, suggesting a potential consequence of the EMIC wave-driven proton precipitation. The Global Airglow model simulations confirmed the dominant impact of proton precipitation on the ionosphere and agreed well with PFISR observations. This study confirmed physical links from the magnetosphere to the ionosphere through EMIC-driven proton precipitation.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 128
Issue: 1
Article number: e2022JA030983
DOI: 10.1029/2022JA030983
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the National Natural Science Foundation of China Grants 41974192 and 41821003, and by the Fundamental Research Funds for the Central Universities. This work has been supported by JSPS KAKENHI 16H06286, 21K18651, 21H04518, 21KK0059, and 22H01283. The authors thank the CARISMA team for making available the data. CARISMA is operated by the University of Alberta, funded by the Canadian Space Agency.
Copyright information: © 2023. American Geophysical Union. All Rights Reserved.