論文

査読有り 筆頭著者
2022年10月

The Effect of the Chromospheric Temperature on Coronal Heating

ASTROPHYSICAL JOURNAL
  • Haruka Washinoue
  • ,
  • Munehito Shoda
  • ,
  • Takeru K. Suzuki

938
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.3847/1538-4357/ac91c8
出版者・発行元
IOP Publishing Ltd

Recent observational and numerical studies show a variety of thermal structures in the solar chromosphere. Given that the thermal interplay across the transition region is a key to coronal heating, it is worth investigating how different thermal structures of the chromosphere yield different coronal properties. In this work, by MHD simulations of Alfven-wave heating of coronal loops, we study how the coronal properties are affected by the chromospheric temperature. To this end, instead of solving the radiative transfer equation, we employ a simple radiative loss function so that the chromospheric temperature is easily tuned. When the chromosphere is hotter, because the chromosphere extends to a larger height, the coronal part of the magnetic loop becomes shorter, which enhances the conductive cooling. A larger loop length is therefore required to maintain the high-temperature corona against the thermal conduction. From our numerical simulations we derive a condition for the coronal formation with respect to the half loop length l(loop) in a simple form: l(loop) > aT(min) + l(th), where T-min is the minimum temperature in the atmosphere, and parameters a and l(th) have negative dependencies on the coronal field strength. Our conclusion is that the chromospheric temperature has a nonnegligible impact on coronal heating for loops with small lengths and weak coronal fields. In particular, the enhanced chromospheric heating could prevent the formation of the corona.

リンク情報
DOI
https://doi.org/10.3847/1538-4357/ac91c8
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000870480800001&DestApp=WOS_CPL
ID情報
  • DOI : 10.3847/1538-4357/ac91c8
  • ISSN : 0004-637X
  • eISSN : 1538-4357
  • Web of Science ID : WOS:000870480800001

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