Hosokawa, K., Miyoshi, Y., Ozaki, M. et al. Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves. Sci Rep 10, 3380 (2020). https://doi.org/10.1038/s41598-020-59642-8
Multiple time-scale beats in aurora : precise orchestration via magnetospheric chorus waves
|Author:||Hosokawa, K.1,2; Miyoshi, Y.3; Ozaki, M.4;|
1Graduate School of Informatics and Engineering, University of Electro-Communications, Chofu, Tokyo, Japan
2Center for Space Science and Radio Engineering, University of Electro-Communications, Chofu, Tokyo, Japan
3Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi, Japan
4Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa, Japan
5National Institute of Polar Research, Tachikawa, Tokyo, Japan
6Ionospheric Physics Research Unit, University of Oulu, Oulu, Finland
7The Graduate University for Advanced Studies, Hayama, Kanagawa, Japan
8Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
9Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, Japan
10Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
11Research Organization of Information and Systems, Tokyo, Japan
|Online Access:||PDF Full Text (PDF, 2.9 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020041516592
|Publish Date:|| 2020-04-15
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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
K.H., Y.M., S.O., Y.O. and R.F. are supported by JSPS Kakenhi (15H05747). Y.M. and R.K. are supported by JSPS Kakenhi (15H05815). Y.M., M.O., S.O., S.K., R.K. and K.S. are supported by JSPS Kakenhi (16H06286). K.H., Y.M. and S.K. are supported by the International Space Science Institutes Beijing (ISSI-BJ) International Team program. Y.M., M.O, Y.K., S.K., K.S. and Y. Kasahara are supported by JSPS Bilateral Open Partnership Joint Research Projects. Y. Kasahara is supported by JSPS Kakenhi (16H04056 and 16H01172). I.S. is supported by JSPS Kakenhi (17H06140). The Arase (ERG) satellite science data were obtained from the ERG Science Center operated by the Institute of Space and Astronautical Science of the Japan Aerospace eXploration Agency and the Institute for Space-Earth Environmental Research of Nagoya University (https://ergsc.isee.nagoya-u.ac.jp/index.shtml.en). The operation of the EMCCD camera at Sodankylä has been supported by the Sodankylä Geophysical Observatory (SGO). The operation of the EMCCD camera at Kevo has been supported by the Finnish Meteorological Institute (FMI) and Kevo Subarctic Research Institute, Turku University. The operation of the EMCCD camera at Gakona has been supported by the University of Alaska Fairbanks (UAF).
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