Moving Magnet Features around Sunspots

Details Moving Magnet Features around Sunspots Moving Magnet Features around Sunspots

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42b0544h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42B-0544

Statistics

7507 Chromosphere, 7509 Corona, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Moving magnetic features (MMF's) associated with small-scale emerging fluxes near the sunspot penumbra are believed to play an important role in mass and energy flow near sunspots. Since their discovery 30 year ago, only a few theoretical interpretations have been proposed on the real identity of MMF's: they may be associated with field lines detached from a decaying spot, or with closed magnetic loops. MMF's have remained a difficult subject for observations, requiring high spatial resolution movies for at least several hours. Coronal emission does not show immediate response to the birth and disappearance of individual MMF's; and the role of MMF's in the dynamics of upper layers of the atmosphere remains unclear. We present the results of recent, multi-wavelength observations designed to study the dynamics of MMF's from the time of their emergence to the moment when they merge into network or moat. Vector magnetograms made with the Dunn Telescope at Sunspot, NM, are co-aligned with MDI magnetograms, and TRACE 1600 Å and Fe IX/X 171 Å images, showing field orientation at the site of emergence, and the response of the chromosphere and corona to dynamic changes in the MMF's. These data allow meaningful statistics on MMF's and their relation to sunspot evolution.

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