Time-dependent interaction of granules with magnetic flux tubes |
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| Authors: | P Venkatakrishnan S S Hasan |
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| Institution: | (1) Indian Institute of Astrophysics, 560034 Bangalore |
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| Abstract: | The time-dependent interaction of the granulation velocity field with a magnetic flux tube is investigated here. It is seen
that when a magnetic field line is displaced normal to itself so as to simulate thebuffeting action of granules, a flow of gas is initiated along the field. By choosing a lateral velocity field which is consistent
with observations of granules, it is found that the resulting gas motion is a downward flow with a velocity compatible with
the observed downflow in isolated photospheric flux tubes. It is therefore proposed that the observed photospheric downflow
is a manifestation of the interaction of granules with flux tubes. |
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| Keywords: | Sun small scale magnetic fields granules downdrafts fluid dynamics unsteady one-dimensional flow |
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