SOLAR DYNAMICS OBSERVATORY DISCOVERS THIN HIGH TEMPERATURE STRANDS IN CORONAL ACTIVE REGIONS

作者：Reale Fabio^*; Guarrasi Massimiliano; Testa Paola; DeLuca Edward E; Peres Giovanni; Golub Leon

来源：Astrophysical Journal Letters, 2011, 736(1): L16.

DOI：10.1088/2041-8205/736/1/L16

• Sun: corona
• Sun: UV radiation

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 (similar to 1 MK and similar to 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 similar to 10 MK. That work predicts that images of hot coronal loops (greater than or similar to 6MK) 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.

• 出版日期2011-7-20