Hydrodynamic models of transiently heated coronal loops

Details Hydrodynamic models of transiently heated coronal loops Hydrodynamic models of transiently heated coronal loops

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..583s&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Astronomy and Astrophysics

Astrophysics

Solar Corona, Transition Region, Coronal Heating

Scientific paper

We investigate the hydrodynamic behaviour of coronal loops undergoing transient heating. We adopt a 1-D loop model with space- and time-dependent heating, concentrated near the chromospheric footpoints. The timescale of heating variations is comparable with the radiative cooling time of the coronal plasma (~103s). We use a new numerical code that has a fully adaptive grid, in order to properly resolve the chromospheric-coronal transition region sections of the loop. We simulate here the hydrodynamics of a loop with different effective gravity (i.e., loop geometry) and heating terms. We describe the temporal behaviour of the various physical quantities along the loop (plasma density, temperature, flow velocity), showing that the increase in heating produces a chromospheric evaporation, or a siphon flow if the loop heating is taken to be significantly different at the two footpoints, followed by long-lasting downflows with velocities of a few km s-1 during the quiescent phases in between the episodic heatings. Moreover, in the case of considerable increase in heating, a catastrophic cooling of the loop plasma can occur, giving rise to downflows of several tens of km s-1.

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