• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2018 Fiscal Year Final Research Report

Spatial and temporal evolution of the plasma flow channel including its interface

Research Project

  • PDF
Project/Area Number 15K05300
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionKyoto University

Principal Investigator

TAGUCHI Satoshi  京都大学, 理学研究科, 教授 (80251718)

Project Period (FY) 2015-04-01 – 2019-03-31
Keywords電離圏 / 極域 / プラズマフロー / 中性大気質量密度異常 / オーロラ / カスプ
Outline of Final Research Achievements

Plasma flow channels, i.e., narrow channels of high-speed plasma flow, are embedded in the large-scale plasma circulation in the high-latitude ionosphere. In this study we showed the spatial and temporal characteristics of the plasma flow channel by using data obtained simultaneously from multi-instruments. By means of numerical simulation, we showed that neutral mass density anomalies, which are often seen in the plasma flow channel, are mostly caused by the particle heating from the low-energy (~100 eV) electron precipitation rather than the enhanced Joule heating directly associated with the high-speed plasma flow.

Free Research Field

太陽地球系物理学

Academic Significance and Societal Importance of the Research Achievements

高緯度電離圏のフローチャネル領域にほぼ一致するように中性大気の質量密度の異常な上昇が観測されている.そのような領域を人工衛星が飛ぶと,質量密度上昇に応じて抗力を受けるため,時として軌道を著しく変えられ,衛星寿命が縮むことさえある.このような重要な現象ではあるが,これまでどのような物理過程がどの程度効いているのかは明らかになっていなかった.フローチャネル領域に磁気圏から降り注いでいる比較的低いエネルギーの電子による加熱過程が重要な役割を果たしていることを示したことに意義がある.

URL: 

Published: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi