論文

査読有り
2018年9月7日

Direct measurements of two-way wave-particle energy transfer in a collisionless space plasma

Science
  • N. Kitamura
  • M. Kitahara
  • M. Shoji
  • Y. Miyoshi
  • H. Hasegawa
  • S. Nakamura
  • Y. Katoh
  • Y. Saito
  • S. Yokota
  • D. J. Gershman
  • A. F. Vinas
  • B. L. Giles
  • T. E. Moore
  • W. R. Paterson
  • C. J. Pollock
  • C. T. Russell
  • R. J. Strangeway
  • S. A. Fuselier
  • J. L. Burch
  • 全て表示

361
6406
開始ページ
1000
終了ページ
1003
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1126/science.aap8730

Particle acceleration by plasma waves and spontaneous wave generation are fundamental energy and momentum exchange processes in collisionless plasmas. Such wave-particle interactions occur ubiquitously in space. We present ultrafast measurements in Earth’s magnetosphere by the Magnetospheric Multiscale spacecraft that enabled quantitative evaluation of energy transfer in interactions associated with electromagnetic ion cyclotron waves. The observed ion distributions are not symmetric around the magnetic field direction but are in phase with the plasma wave fields. The wave-ion phase relations demonstrate that a cyclotron resonance transferred energy from hot protons to waves, which in turn nonresonantly accelerated cold He+ to energies up to ~2 kilo–electron volts. These observations provide direct quantitative evidence for collisionless energy transfer in plasmas between distinct particle populations via wave-particle interactions.

リンク情報
DOI
https://doi.org/10.1126/science.aap8730
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/30190400
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85052861158&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85052861158&origin=inward
ID情報
  • DOI : 10.1126/science.aap8730
  • ISSN : 0036-8075
  • eISSN : 1095-9203
  • PubMed ID : 30190400
  • SCOPUS ID : 85052861158

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