Plasmasphere Control of ULF Wave Distribution at Different Geomagnetic Conditions

DOI Web Site 研究データあり 被引用文献1件 参考文献121件
  • A. V. Rubtsov
    Institute of Solar‐Terrestrial Physics SB RAS Irkutsk Russia
  • M. Nosé
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • A. Matsuoka
    Graduate School of Science Kyoto University Kyoto Japan
  • Y. Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • A. Kumamoto
    Graduate School of Science Tohoku University Sendai Japan
  • F. Tsuchiya
    Graduate School of Science Tohoku University Sendai Japan
  • I. Shinohara
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan

書誌事項

公開日
2023-10
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2023ja031675
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Magnetic storms and substorms cause global disturbances in the Earth's magnetosphere. Plasma clouds injected from the magnetotail during storm or substorm drift around the Earth and generate ultra‐low frequency (ULF) waves via various mechanisms. At the same time, the inner part of the magnetosphere called plasmasphere is filled with cold particles and its characteristics are sensitive to the geomagnetic activity level. Previous theoretical and some observational studies suggested plasmasphere and its boundary, plasmapause, are special regions for ULF waves to interact with charged particles. We present a statistical analysis of ULF waves during different geomagnetic conditions. We utilized Arase satellite magnetic field and electron density measurements from March 2017 to December 2020 to investigate spatial distribution of ULF waves and its dependence on the plasmapause location. A 1–2 <jats:italic>R</jats:italic><jats:sub><jats:italic>E</jats:italic></jats:sub> gap between the plasmapause and a region of high transverse waves occurrence rate was found. This gap keeps during quiet geomagnetic conditions when plasmasphere expands, and we concluded that the plasmapause controls the ULF wave distribution in the magnetosphere. ULF wave occurrence rate significantly decreases at quiet time, but dayside and dawnside maxima still occur for poloidal and compressional, and toroidal waves, respectively. Thus, we can distinguish internally and externally excited waves. Average wave frequency distribution revealed field‐line resonance character of toroidal waves as frequency increases toward the Earth. Poloidal and compressional waves distributions clearly distinguish low frequency externally excited waves and high frequency storm‐time pulsations.</jats:p>

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