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Flow in coronal loops with a mass source
Authors:Giancarlo Noci  Francesca Zuccarello
Institution:1. Istituto di Astronomia, Università di Padova, Padova, Italy
2. Osservatorio Astrofisico di Catania, Catania, Italy
Abstract:This research studies the flow of plasma inside a coronal loop in which an injection of plasma through the lateral surface is permitted. The flow is assumed steady and polytropic. The problem covers two cases: (a) upflow at one footpoint, downflow at the other; (b) downflow at both footpoints. The first case can be shown to be quite similar to that of a mass-conserving flow with variable cross section; the second, instead, is characterized by solutions with a different type of topology; its main new feature is the obvious fact that all the solutions pass through a single point going from negative to positive velocities. In this second case the density ratio between footpoints and top can be much smaller than in a mass conserving flow. This can explain some properties of observed loops.
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