Temperature Analysis of Coronal Loop Cross-Sections: Monolithic vs. Nanoflare Heating

Details Temperature Analysis of Coronal Loop Cross-Sections: Monolithic vs. Nanoflare Heating Temperature Analysis of Coronal Loop Cross-Sections: Monolithic vs. Nanoflare Heating

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0504a&link_type=abstract

American Astronomical Society, SPD meeting #42, #5.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We present a first systematic study on the cross-sectional temperature structure of coronal loops using the six coronal temperature filters of the Atmospheric Imaging Assembly (AIA) instrument on the Solar Dynamics Observatory (SDO). We analyze a sample of 100 loop snapshots measured at 10 different locations and 10 different times in active region NOAA 11089 on 2010 July 24, 21:00-22:00 UT.
The cross-sectional flux profiles are measured and a cospatial background is subtracted in 6 filters in a temperature range of T ≈ 0.5-16 MK, and 4 different parameterizations of differential emission measure (DEM) distributions are fitted. We find that the reconstructed DEMs consist predominantly of narrowband peak temperature components with a thermal width of σlog(T) ≤ 0.11±0.02, close to the temperature resolution limit of the instrument, consistent with earlier triple-filter analysis from TRACE by Aschwanden and Nightingale (2005) and from EIS/Hinode by Warren et al. (2008) or Tripathi et al. (2009). We find that 66% of the loops could be fitted with a narrowband single-Gaussian DEM model, and 19% with a DEM consisting of two narrowband Gaussians (which mostly result from pairs of intersecting loops along the same line-of-sight). The mostly isothermal loop DEMs allow us also to derive an improved empirical response function of the AIA 94 [[Unable to Display Character: Ǻ]] filter, which needs to be boosted by a factor of q94 = 6.7± 1.7 for temperatures at log(T)

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