Emission Measure Distribution and Heating of Two Active Region Cores

Details Emission Measure Distribution and Heating of Two Active Region Cores Emission Measure Distribution and Heating of Two Active Region Cores

2011-07-22

arxiv.org/abs/1107.4480v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

24 pages, 9 Figures, Accepted for Publication in The Astrophysical Journal

Scientific paper

Using data from the Extreme-ultraviolet Imaging Spectrometer aboard Hinode, we have studied the coronal plasma in the core of two active regions. Concentrating on the area between opposite polarity moss, we found emission measure distributions having an approximate power-law form EM$\propto T^{2.4}$ from $\log\,T = 5.5$ up to a peak at $\log\,T = 6.55$. We show that the observations compare very favorably with a simple model of nanoflare-heated loop strands. They also appear to be consistent with more sophisticated nanoflare models. However, in the absence of additional constraints, steady heating is also a viable explanation.

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