Red Auroras Discovered at Unprecedented Heights Above Japan
The Story
Scientists from Hokkaido University and the Okinawa Institute of Science and Technology observed red auroras above Japan reaching altitudes of 500 to 800 kilometers during geomagnetic storms measured as moderate. The findings, published in the Journal of Space Weather and Space Climate, suggest these storms may be stronger than conventional indices indicate.
Key Facts
- The study examined five auroral events recorded in Hokkaido between June 2024 and March 2025.
- Red auroras typically occur at altitudes of 200 to 400 kilometers, but the new observations extended up to 800 kilometers.
- Lead author Tomohiro M. Nakayama stated he was surprised because such tall auroras appeared during moderately intense storms.
- Researchers combined satellite observations with photographs from citizen scientists across Japan to estimate the auroras’ heights.
- The findings may have implications for satellites, as heated and expanded upper atmosphere increases atmospheric drag.
Conflicting Reports
No conflicting reports identified in the source article.
Still Unclear
No open questions identified in the source article.
Misconceptions
No widespread misconceptions addressed in the source article.
Key Figures
- Tomohiro M. Nakayama, lead author of the study, affiliated with Hokkaido University (as stated in source: “Tomohiro M. Nakayama, lead author of the study” – note: the journal reference lists two authors: Tomohiro M. Nakayama and Ryuho Kataoka, but the article only quotes Nakayama as lead author).
Sources: ScienceDaily
