University of Oulu

Lee, J.‐H., Jee, G., Kwak, Y.‐S., Hong, S.‐b., Hwang, H., Song, I.‐S., et al. ( 2018). Responses of nitrogen oxide to high‐speed solar wind stream in the polar middle atmosphere. Journal of Geophysical Research: Space Physics, 123, 9788– 9801. https://doi.org/10.1029/2017JA025161

Responses of nitrogen oxide to high‐speed solar wind stream in the polar middle atmosphere

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Author: Lee, Ji‐Hee1; Jee, Geonhwa1,2; Kwak, Young‐Sil3,4;
Organizations: 1Korea Polar Research Institute, Incheon, South Korea
2Department of Polar Science, Korea University of Science and Technology, Daejeon, South Korea
3Korea Astronomy and Space Science Institute, Daejeon, South Korea
4Department of Astronomy and Space Science, Korea University of Science and Technology, Daejeon, South Korea
5Department of Astronomy and Space Science, Chungnam National University, Daejeon, South Korea
6Sodankylä Geophysical Observatory, University of Oulu, Tähteläntie, Finland
7Department of Astronomy and Space Science, Chungbuk National University, Cheongju, South Korea
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019062421752
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-06-24
Description:

Abstract

During high‐speed solar wind stream (HSS) events, energetic electrons from the Earth’s inner magnetosphere transfer solar wind energy to the high‐latitude upper atmosphere, which may affect chemical compositions in the region. We conduct a study on the production of nitrogen oxides (NOₓ) in the polar middle atmosphere by energetic electron precipitation (EEP) during HSS events in the period of international polar year 2007–2008 northern winter. During this period, the geomagnetic activity was generally quiet and there were no major solar events, which indicates that the EEPs were mostly associated with HSS events. The electron flux immediately increases with the onset of HSS events and remains elevated during the passage of the events. The estimation of the directly produced NOx by EEPs was attempted by using the correlation between NOₓ and dynamic tracers such as CO and CH₄. It was found that the direct effect of EEPs on NOₓ reaches down to about 55‐km altitude and the amount is estimated to be about 2 ppbv. This result indicates that the variations of polar stratospheric NOₓ in winter are mostly associated with dynamical processes such as vertical transport and horizontal mixing. We also found that the middle atmospheric O₃ depletion during HSS events seems to be related to the EEP‐induced NOₓ at least in the uppermost stratosphere in the polar region.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 123
Issue: 11
Pages: 9788 - 9801
DOI: 10.1029/2017JA025161
OADOI: https://oadoi.org/10.1029/2017JA025161
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was supported by the grant PE18020 from the Korea Polar Research Institute. Y.‐S. Kwak was supported by the “Operation and application researches of space weather research center” project from Korea Astronomy and Space Science Institute (KASI) and by Air Force Office of Scientific Research (AFOSR)/Asian Office of Aerospace Research and Development (AOARD) grant FA2386‐18‐1‐0107. Y.‐S. Lee acknowledges support from Chungnam National University.
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.