Spatial distributions of absorption, local suppression, and emissivity reduction of solar acoustic waves in magnetic regions

Dean Yi Chou*, Ming Hsu Yang, Hui Zhao, Zhi Chao Liang, Ming Tsung Sun

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

15 Scopus citations

Abstract

Observed acoustic power in magnetic regions is lower than the quiet Sun because of absorption, emissivity reduction, and local suppression of solar acoustic waves in magnetic regions. In the previous studies, we have developed a method to measure the coefficients of absorption, emissivity reduction, and local suppression of sunspots. In this study, we go one step further to measure the spatial distributions of three coefficients in two active regions, NOAA 9055 and 9057. The maps of absorption, emissivity reduction, and local suppression coefficients correlate with the magnetic map, including plage regions, except the emissivity reduction coefficient of NOAA 9055 where the emissivity reduction coefficient is too weak and lost among the noise.

Original languageEnglish
Pages (from-to)909-916
Number of pages8
JournalAstrophysical Journal
Volume706
Issue number1
DOIs
StatePublished - 2009

Keywords

  • Sun: Activity
  • Sun: Helioseismology
  • Sun: Interior
  • Sunspots

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