Intensity and Velocity Structure of a Light Bridge in a Pore Seen by IBIS at NSO/DST: Analysis and Interpretation

Details Intensity and Velocity Structure of a Light Bridge in a Pore Seen by IBIS at NSO/DST: Analysis and Interpretation Intensity and Velocity Structure of a Light Bridge in a Pore Seen by IBIS at NSO/DST: Analysis and Interpretation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh22a0844b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH22A-0844

Physics

Optics

7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Light bridges are bright structures separating umbral areas of pores or sunspots in two or more sub-regions. We analyze intensity and velocity small scale properties of a light bridge, observed in the pore AR10812, using both broad-band and monochromatic images acquired with the Interferometric BI-dimensional Spectrometer (IBIS) at the adaptive optics channel of the NSO/Dunn Solar Telescope. The observed pore shows a mean downward velocity of about -200 m/s and an external annulus with average downward velocity of -350 m/s. Besides, an elongated dark structure along light bridge axis matches a feeble upward plasma structure of about +100 m/s. We interpret this sort of reversed convective feature as a consequence of the higher gas pressure in a photospheric field-free cusp, above the light bridge, located between two magnetic walls. To reproduce this configuration, we developed a simple light bridge thermal model in which we consider a quiet field free region below a partially emptied of plasma magnetic region.

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