Discovery of High-Altitude Red Auroras Over Japan Reveals Stronger Solar Activity
Scientists discover towering red auroras reaching deep into space above Japan
Science Daily
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Scientists from Hokkaido University have discovered red auroras over Japan reaching altitudes of 500 to 800 kilometers, suggesting that solar storms may be stronger than previously understood. This finding has significant implications for satellites, as increased atmospheric drag could alter their trajectories.
- 01Red auroras were observed at altitudes of 500 to 800 kilometers, much higher than the typical 200 to 400 kilometers associated with auroras during geomagnetic storms.
- 02The study analyzed five auroral events from June 2024 to March 2025, revealing unexpected heights during storms classified as moderate.
- 03Lead researcher Tomohiro M. Nakayama noted, 'I was really surprised because I didn't expect such tall auroras to appear even during moderately intense storms.'
- 04The research combined satellite data with citizen scientist photographs, enhancing the study of these rare auroras.
- 05Understanding these auroras is crucial for satellite operations, as heating and expansion of the upper atmosphere can lead to increased atmospheric drag.
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Recent research conducted by scientists at Hokkaido University and the Okinawa Institute of Science and Technology has revealed that red auroras over Japan can reach astonishing altitudes of 500 to 800 kilometers, significantly higher than the previously understood range of 200 to 400 kilometers. This discovery indicates that solar storms may be more powerful than previously thought, as these red auroras were observed even during storms classified as moderate. The study, published in the *Journal of Space Weather and Space Climate*, analyzed five auroral events between June 2024 and March 2025, during which Earth's magnetosphere was compressed by streams of charged solar particles. Lead author Tomohiro M. Nakayama expressed surprise at the findings, suggesting that the storms may be stronger than conventional measurements indicate. The research utilized both satellite observations and photographs from citizen scientists, allowing for a detailed analysis of the auroras' heights. The implications of this discovery extend beyond visual phenomena, as the heating and expansion of the upper atmosphere can increase atmospheric drag on satellites, potentially altering their trajectories. As the number of satellites in low Earth orbit increases, understanding these effects becomes crucial for safer satellite operations.
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The discovery of high-altitude red auroras may affect satellite operations, as increased atmospheric drag could alter satellite trajectories.
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