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Markus J. Aschwanden   Submitted: 2007-12-24 13:07

The physical state of coronal loops is often studied with scaling laws that are derived from an equilibrium solution, where the heating rate balances the loss rates by radiation and thermal conduction. Recent analysis of EUV data at temperatures of T_1 approx 1.0 MK, however, exhibit huge overpressures (or overdensities) q1 up to a few orders of magnitude for long loops, compared with stationary equilibrium models. This overpressure can naturally be explained by the non-stationary cooling process alone, in the absence of any heating, which follows approximately the {sl Jakimiec scaling} of T(t) propto n(t)^2. In this Letter we show that the observed overpressure q_1=n_1/n_0 (with respect to the RTV density n_0 propto T_1^2/L) can be used as a new diagnostic to determine the peak density, n_p approx n_0 q_14/3, and peak temperature, T_p approx T_1 q_12/3, to which the loop was heated before onset of the cooling phase. This new non-equlibirum scaling law provides soft X-ray predictions based on EUV observations.

Authors: Markus J. Aschwanden
Projects: TRACE

Publication Status: ApJ Letter (revised, Version 2008 jan 9)
Last Modified: 2008-01-09 12:10
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