Moving Magnetic Features Inside the Penumbra of NOAO 10008

Details Moving Magnetic Features Inside the Penumbra of NOAO 10008 Moving Magnetic Features Inside the Penumbra of NOAO 10008

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11a..05l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11A-05

Physics

7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Over 30 years of observations and theories comprise the study of moving magnetic features (MMFs). MMFs, which often occur in opposite polarity pairs, migrate radially outward through the sunspot moat at speeds of about 1 km~s-1. A sequence of sixteen scans of the active region NOAO 10008 were taken using the NSO-CSUN IR camera at the NSO McMath-Pierce Solar Telescope on 24 June 2002 17:38-21:59. Using the Fe I absorption line at 1564.8nm, magnetogram images and maps of the magnetic field vector were produced, revealing magnetic features within the penumbra that appear to move radially outward at similar velocities and azimuth angles as those of MMFs in the moat. We use polar time slice images to measure the radial velocities of both types of features. This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program.

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