Thermal evolution of coronal active regions observed with the Yohkoh soft X-ray telescope

S. Yashiro, K. Shibata, M. Shimojo

Research output: Contribution to journalArticlepeer-review

Abstract

We study the thermal evolution of active regions in the corona by analyzing 51 emerging flux regions (EFRs) observed with the soft X-ray telescope aboard Yohkoh. We derive the mean temperature and pressure of active regions as a function time using filter ratio technique, and found that the mean temperature increases with its expansion. We also studied the relationship between the region size and the temperature, and found that the temperature (T) and the pressure (P) of EFRs increase with increasing region size (L); T ∝ L 0.42 , P ∝ L 0.25 .

Original languageEnglish
Pages (from-to)1773-1776
Number of pages4
JournalAdvances in Space Research
Volume25
Issue number9
DOIs
Publication statusPublished - May 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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