2020年2月25日
Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves
Scientific reports
- 巻
- 10
- 号
- 1
- 開始ページ
- 3380
- 終了ページ
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41598-020-59642-8
The brightness of aurorae in Earth's polar region often beats with periods ranging from sub-second to a few tens of a second. Past observations showed that the beat of the aurora is composed of a superposition of two independent periodicities that co-exist hierarchically. However, the origin of such multiple time-scale beats in aurora remains poorly understood due to a lack of measurements with sufficiently high temporal resolution. By coordinating experiments using ultrafast auroral imagers deployed in the Arctic with the newly-launched magnetospheric satellite Arase, we succeeded in identifying an excellent agreement between the beats in aurorae and intensity modulations of natural electromagnetic waves in space called "chorus". In particular, sub-second scintillations of aurorae are precisely controlled by fine-scale chirping rhythms in chorus. The observation of this striking correlation demonstrates that resonant interaction between energetic electrons and chorus waves in magnetospheres orchestrates the complex behavior of aurora on Earth and other magnetized planets.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41598-020-59642-8
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/32098993
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85080098956&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85080098956&origin=inward
- ID情報
-
- DOI : 10.1038/s41598-020-59642-8
- eISSN : 2045-2322
- PubMed ID : 32098993
- SCOPUS ID : 85080098956