4.6 Article

CAN A LONG NANOFLARE STORM EXPLAIN THE OBSERVED EMISSION MEASURE DISTRIBUTIONS IN ACTIVE REGION CORES?

Journal

ASTROPHYSICAL JOURNAL LETTERS
Volume 742, Issue 1, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/742/1/L6

Keywords

Sun: corona

Funding

  1. NASA
  2. STFC [ST/H000429/1, PP/D002907/1] Funding Source: UKRI
  3. Science and Technology Facilities Council [ST/H000429/1, PP/D002907/1] Funding Source: researchfish
  4. UK Space Agency [ST/J001732/1] Funding Source: researchfish

Ask authors/readers for more resources

All theories that attempt to explain the heating of the high-temperature plasma observed in the solar corona are based on short bursts of energy. The intensities and velocities measured in the cores of quiescent active regions, however, can be steady over many hours of observation. One heating scenario that has been proposed to reconcile such observations with impulsive heating models is the long nanoflare storm, where short-duration heating events occur infrequently on many sub-resolution strands; the emission of the strands is then averaged together to explain the observed steady structures. In this Letter, we examine the emission measure distribution predicted for such a long nanoflare storm by modeling an arcade of strands in an active region core. Comparisons of the computed emission measure distributions with recent observations indicate that the long nanoflare storm scenario implies greater than five times more 1 MK emission than is actually observed for all plausible combinations of loop lengths, heating rates, and abundances. We conjecture that if the plasma had super coronal abundances, the model may be able to match the observations at low temperatures.

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