Solar Dynamics Observatory Discovers Thin High Temperature Strands in Coronal Active Regions

Giovanni Peres, Fabio Reale, Leon Golub, Leon Golub, Edward E. Deluca, Fabio Reale, Giovanni Peres, Paola Testa, Massimiliano Guarrasi

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

One scenario proposed to explain the million degree solar corona is a finely stranded corona where each strand is heated by a rapid pulse. However, such fine structure has neither been resolved through direct imaging observations nor conclusively shown through indirect observations of extended superhot plasma. Recently, it has been shown that the observed difference in the appearance of cool and warm coronal loops (~1 MK and ~2-3 MK, respectively)—warm loops appearing "fuzzier" than cool loops—can be explained by models of loops composed of subarcsecond strands, which are impulsively heated up to ~10 MK. That work predicts that images of hot coronal loops (> 6 MK) should again show fine structure. Here we show that the predicted effect is indeed widely observed in an active region with the Solar Dynamics Observatory, thus supporting a scenario where impulsive heating of fine loop strands plays an important role in powering the active corona.
Original languageEnglish
Pages (from-to)L16-L20
Number of pages5
JournalTHE ASTROPHYSICAL JOURNAL LETTERS
Volume736
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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