34th Solar Physics Division Meeting, June 2003
Session 17 Corona III
Poster, Wednesday, June 18, 2003, 3:30-5:00pm, Mezzanine

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[17.02] Hydrodynamic Model of Loops Heated by Microflares at the Footpoints

P. Testa (Dip. Scienze Fisiche e Astron., Univ. di Palermo; Harvard-Smithsonian CfA), G. Peres (Dip. Scienze Fisiche e Astron., Univ. di Palermo)

We simulate loops maintained in coronal conditions by random heat pulses concentrated close to the footpoints, by using the Palermo-Harvard 1-D hydrodynamic code. We have explored the existence of dynamic but quasi-static solutions when the heating is very concentrated at footpoints whereas the heating concentrated at footpoints does not allow static loop models solutions. We studied the characteristics of the solutions (in terms of stability, density and temperature structure, emission measure distribution) as a function of the parameters that define the heating function, for three different loop lengths.

We found stable solutions even for heating concentrated over spatial regions of the order of L/5 and higher values. For these stable solutions, the average temperature profiles as a function of the loop coordinate show a flatter or even inverted profile (for the case with more concentrated heating) with respect to the standard static models; the emission measure distribution as a function of temperature is much steeper (up to ~T5) than the usual behavior as T3/2 of the hydrostatic standard models.


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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.