SSP seminar

SDO-AIA DEM: Initial Results

Joan Schmelz (University of Memphis)

Thursday 2nd June 2011, 12:30 pm
Pratt conference room, 60 Garden Street

An important component of the coronal loop controversy involves conflicting results on the diagnostic of one of the fundamental properties: the cross-field temperature distribution. Are loops isothermal or multithermal? Is the observed loop a single flux tube or a collection of tangled magnetic strands? Resolving this controversy has important implications for the coronal heating problem. The coronal filters in the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory peak at different temperatures; the series covers the entire active region temperature range, making AIA ideal for multithermal analysis. Here we analyze coronal loops from several active regions that have been observed by AIA. We find that a few of our loops have narrow temperature distributions, which may be consistent with isothermal plasma and can be modeled with a single flux tube. Other loops, however, have broader temperature distributions, and are not well-modeled by isothermal plasma; these appear to be multi-stranded. These results are limited by missing cool (~1 MK) emission lines in the 131- and 94-A AIA channels.


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