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

Yusuke Yonezu, Kazuo Shiokawa, Martin Connors, Mitsunori Ozaki, Jyrki Manninen, Hisao Yamagishi, Masaki Okada

Research output: Contribution to journalJournal Articlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)6442-6454
Number of pages13
JournalJournal of Geophysical Research: Space Physics
Issue number6
Publication statusPublished - 1 Jun. 2017


  • QP emission
  • chorus
  • hiss
  • longitudinal extent
  • magnetospheric ELF/VLF waves
  • simultaneous observation


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