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Markus J. Aschwanden   Submitted: 2007-12-19 15:59

Using the stereoscopically derived 3D geometry of 30 loops observed with STEREO/EUVI (described in Paper I), we determine here the electron density profiles n_e(s) and electron temperature profiles Te(s) from a triple-filter analysis of the stereoscopic images taken in the wavelengths of lambda= 171, 195, and 284 ang . The statistical results of our analysis of 7 complete loops are: observed loop widths wobs=2.6pm 0.1 Mm, corresponding to effective loop widths of w=1.1pm0.3 Mm if corrected for the instrumental point-spread function, loop flux ratios floop/ftotal = 0.11 pm 0.04, mean loop (DEM peak) temperatures T_p=1.1 pm 0.2 MK, DEM temperature gaussian widths sigmaDEM=0.35pm 0.04 MK, temperature variations along loops sigma_T/T_p=0.24 pm 0.05, (resolution-corrected) loop base densities n_e=(2.2 pm 0.5) imes 109 cm-3, loop lengths of L=130 pm 67 Mm, and all quantities are found to agree between STEREO/A and B within a few percent. The temperature profiles T(s) along loops are found to be nearly constant, within the uncertainties of the background subtraction. The density profiles n_e(s) are consistent with hydrostatic loops, n_e(h)=nbase exp(-h/lambda_T), predicted by the temperature scale heights lambda_T, using the stereoscopically measured height profiles h(s). The stereoscopic 3D reconstruction allows us for the first time to accurately measure the loop length L and to test loop scaling laws. We find that the observations are not consistent with the RTV scaling law (based on a uniform heating function), but are more consistent with Serio's scaling (adapted for footpoint heating) with heating scale heights in the range of s_H approx 5-10 Mm, which corroborates earlier EIT and TRACE results.

Authors: Markus J. Aschwanden, Nariaki Nitta, Jean-Pierre Wuelser, and James Lemen
Projects: STEREO

Publication Status: ApJ (in press, accepted March 4, 2008)
Last Modified: 2008-03-04 14:49
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