University of Oulu

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).

Multiple time-scale beats in aurora : precise orchestration via magnetospheric chorus waves

Saved in:
Author: Hosokawa, K.1,2; Miyoshi, Y.3; Ozaki, M.4;
Organizations: 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
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.9 MB)
Persistent link:
Language: English
Published: Springer Nature, 2020
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.

see all

Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 10
Issue: 1
Article number: 3380
DOI: 10.1038/s41598-020-59642-8
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: 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 ( 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).
Copyright information: © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit