Universal time control of AKR: Earth is a spin-modulated variable radio source

Akira Morioka, Yoshizumi Miyoshi, Satoshi Kurita, Yasumasa Kasaba, Vassilis Angelopoulos, Hiroaki Misawa, Hirotsugu Kojima, James P. McFadden

研究成果: Article

2 引用 (Scopus)

抜粋

Auroral kilometric radiation (AKR) is known to be transient emissions generated by rapidly accelerated electrons together with sudden auroral activation in the polar magnetosphere. In contrast, the characteristics and relationship with the auroral acceleration of rather continuous AKR emissions are not well understood. We examine the emission using long-term data and report that the continuous AKR emission frequency changes with universal time (UT) as the Earth rotates, indicating that the Earth is a spin-modulated variable radio source. The observed UT variation of AKR frequency means that the acceleration altitude changes periodically with planetary rotation. The observations indicate that the diurnal wobble of the tilted geomagnetic field in the solar wind flow alters the magnetosphere-ionosphere (M-I) coupling state in the polar magnetosphere, giving rise to periodic variation of auroral particle acceleration altitude. These observations of planetary radio wave properties provide insight into the physics of planetary particle acceleration. Key Points We found universal time control of AKR frequency. Earth is a spin-modulated variable source. Acceleration altitude changes periodically.

元の言語English
ページ(範囲)1123-1131
ページ数9
ジャーナルJournal of Geophysical Research: Space Physics
118
発行部数3
DOI
出版物ステータスPublished - 2013 1 1

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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