A closer look at a coronal loop rooted in a sunspot umbra

Author： Chitta L. P.   Peter H.   Young P. R.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|587|issue|A20-A20

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.587, Iss.issue, 2016-02, pp. : A20-A20

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Context. Extreme UV (EUV) and X-ray loops in the solar corona connect regions of enhanced magnetic activity, but they are not usually rooted in the dark umbrae of sunspots because the strong magnetic field found there suppresses convection. This means that the Poynting flux of magnetic energy into the upper atmosphere is not significant within the umbra as long as there are no light bridges or umbral dots.

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