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[78.02] Time Variability of Coronal Loops observed by TRACE

R. W. Nightingale, M. J. Aschwanden, N. E. Hurlburt (Lockheed Martin Solar and Astrophysics Lab., Palo Alto, CA)

We attempt the 3-dimensional reconstruction of a set of coronal loops during the period of July 18 - 23, 1998, which has been observed by TRACE with a cadence of a few minutes in the temperature range of 1-1.5 MK. Using the method of ``Dynamic Stereoscopy'' and a filter-ratio technique we obtain density n_e(s,t) and temperature T_e(s,t) profiles along the loop length s with respect to time t. Based on these measurements we calculate the radiative E_R(s,t) and conductive E_C(s,t) losses, and attempt to constrain the heating function E_H(s,t) as a function of loop coordinate and time. We test whether the required heating function corresponds to a steady-state or is governed by episodic heating. In particular we investigate which time intervals are subject to continuous (or recurrent) heating and which are dominated by radiative cooling. From this study we shed some light on theoretical loop models (e.g., Rosner-Tucker-Vaiana steady-state model) and the resulting scaling laws.

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