On the Stability of Siphon Flows Confined in Coronal Loops |
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| Authors: | Rita Betta Salvatore Orlando Giovanni Peres Salvatore Serio |
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| Institution: | (1) Osservatorio Astronomico, Piazza del Parlamento, 1, I-90134 Palermo, Italy;(2) ESA Solar System Division, Space Science Dept., ESTEC (SO), Postbus 299, NL-2200 AG Noordwijk, The Netherlands;(3) Dipartimento di Scienze Fisiche e Astronomiche, Sezione di Astronomia, Università di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy |
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| Abstract: | We use a time-dependent hydrodynamic model to study the dynamics of siphon flows triggered by differences of pressure or heat
deposition asymmetries between the two footpoints of a coronal loop. We show that steady pressure driven flows in a uniformly
heated loop are unstable, whereas those driven by asymmetries in the heating function may be stable. We also show that, in
these cases, relatively cool loops might be filled far above their static pressure scale height.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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