University of Oulu

Yonezu, Y., Shiokawa, K., Connors, M., Ozaki, M., Manninen, J., Yamagishi, H., and Okada, M. ( 2017), Simultaneous observations of magnetospheric ELF/VLF emissions in Canada, Finland, and Antarctica, J. Geophys. Res. Space Physics, 122, 6442– 6454, doi:10.1002/2017JA024211

Simultaneous observations of magnetospheric ELF/VLF emissions in Canada, Finland, and Antarctica

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Author: Yonezu, Yusuke1; Shiokawa, Kazuo1; Connors, Martin2;
Organizations: 1Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
2Centre for Science, Athabasca University, Athabasca, Alberta, Canada
3Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Japan
4Sodankyla Geophysical Observatory, University of Oulu, Sodankyla, Finland
5National Institute of Polar Research, Tachikawa, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: American Geophysical Union, 2017
Publish Date: 2019-09-23


To investigate longitudinal extent of electromagnetic wave activity, we report the first simultaneous ground‐based observations of magnetospheric ELF/VLF emissions at the following three longitudinally separated stations at auroral and subauroral latitudes: Athabasca, Canada (ATH; magnetic latitude: 61.3°N); Kannuslehto, Finland (KAN; 64.4°N); and Syowa Station, Antarctica (SYO; 70.5°S). The magnetic local time (MLT) separations of SYO‐KAN, ATH‐SYO, and ATH‐KAN, are 3, 8, and 11 h, respectively. Simultaneous observation data at these stations are available for a total of 48 days in 2012–2014. The simultaneous occurrence rates of ELF/VLF emissions are 9.8%, 2.5%, and 3.6% for SYO‐KAN, ATH‐SYO, and ATH‐KAN, respectively. We found that the simultaneous wave occurrence rate between two stations is higher in the morning‐dayside sector, indicating that the longitudinal extent of the emissions exhibits MLT dependence. When emissions are simultaneously observed at two stations, the average AE and |Dst| indices tend to be higher. Similarly, if the two stations are more separated in MLT, the average |Dst| index increases. These results suggest that the longitudinal extent of ELF/VLF emissions increases with increasing geomagnetic activity.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 122
Issue: 6
Pages: 6442 - 6454
DOI: 10.1002/2017JA024211
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the Inter‐university Upper atmosphere Global Observation NETwork (IUGONET) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. We were also supported by the Grant‐in‐Aid for Scientific Research (20244080, 23403009, 25302006, 25247080, JP 15H05815, and JP 16H06286) from the Japan Society for the Promotion of Science.
Copyright information: © 2017. American Geophysical Union. All Rights Reserved.