A siphon mechanism for supplying prominence mass |
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| Authors: | A I Poland John T Mariska |
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| Institution: | (1) Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, 20771 Greenbelt, MD, U.S.A.;(2) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5000 Washington, DC, U.S.A. |
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| Abstract: | We examine a siphon-like mechanism for moving mass from the chromosphere to a gravitational well at the top of a magnetic loop to form a prominence. The calculations assume no apriori flow velocity at the loop base. Instead heating in the loop legs drives the flow. The prominence formation process requires two steps. First, the background heating rate must be reduced to on the order of 1 % of the initial heating rate required to maintain the coronal loop. This forms an initial condensation at the top of the loop. Second, the heating must take place only in the loop legs in order to produce a pressure differential which drives mass up into the well at the top of the loop. The heating rate in the loop must be increased once the prominence has begun to form or full prominence densities can not be achieved in a reasonable time. We conclude that this heating driven siphon-like mechanism is feasible for producing and maintaining prominences. |
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