Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh53b..08s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH53B-08
Astronomy and Astrophysics
Astrophysics
[7507] Solar Physics, Astrophysics, And Astronomy / Chromosphere, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection
Scientific paper
Sunspot light bridges are one of the fundamental magnetic structures in sunspots, possibly related to fragmentation of magnetic flux in sunspots. One of the interesting and important observational aspects that some light bridges show chromospheric activities along the structure, such as long-lasting plasma ejections or surge activities (Roy 1973, Asai et al. 2001, Bharti et al. 2007, Shimizu et al. 2009) and brightness enhancements (Berger and Berdyugina 2003). Moreover, X-ray transient brightenings of coronal loops (microflares) may have one loop footpoint near along sunspot light bridges. What are magnetic structures and activities for causing activities in the chromosphere and corona? Precise vector magnetic field measurements with high spatial resolution can give observational hints to this question. This presentation will discuss high-resolution vector magnetic field measurements of sunspot light bridges, some of which showed remarkable chromospheric activities. One good example is a sunspot light bridge observed at the south-east side of the leading sunspot in NOAA Active Region 10953. Long-lasting plasma ejections were intermittently and recurrently observed in the chromosphere for more than 1 days, starting from 20UT on April 29, 2007 and observed through April 30. The light bridge showed several number of brightenings in the chromosphere on May 1. During these three days, SOT successfully captured long-term evolution of fine magnetic structures in the light bridge with Stokes Polarimeter. The magnetic field data suggests that magnetic flux tubes were trapped below a cusp-shaped magnetic structure along the light bridge. The flux tubes were highly twisted on April 30 and less twisted on May 1. Chromospheric ejections and heating, and their different behaviors between on April 30 and May 1 may be explained with evolution of fine magnetic structures along the light bridge. Many observational features can be well explained in terms of magnetic reconnections between the trapped flux tubes and pre-existing vertically oriented umbral fields.
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