Moving Magnetic Features in and out of Penumbral Filaments |
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| Authors: | B Ravindra |
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| Institution: | (1) Department of Physics, Montana State University, Bozeman, MT, 59717, U.S.A. |
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| Abstract: | A time sequence of high-resolution SOHO/MDI magnetograms, Dopplergrams, and continuum images is used to study the moving magnetic
features (MMFs) in and out of penumbral filaments. Precursors of MMFs have been observed inside the penumbral filaments. One
hundred and fifteen out of 127 well-observed individual MMFs in the moat of two sunspots have been identified to have precursors
at an average distance of 4″ inside the penumbral filaments. The velocity of these precursors is small inside the penumbral
filaments and becomes large once the MMFs cross the outer penumbra. The paths followed by the MMFs exhibit large fluctuations
in their magnetic field strength values, with an additional hike in the fluctuations near the outer penumbra. It is also observed
that the path followed by the MMFs appear as a cluster of fibrils which could be traced back inside the penumbra. The appearance
of MMFs and their azimuthal velocity is position and time dependent.
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