2D-spectroscopic observations of G-band bright structures

Details 2D-spectroscopic observations of G-band bright structures 2D-spectroscopic observations of G-band bright structures

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..455l&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Photosphere, Magnetic Elements

Scientific paper

We took two-dimensional spectra with the filter spectrometer TESOS at the German Vacuum Tower Telescope, Tenerife, of an absorption line of the CH-molecule and a Fe II-line in the G-band at 430.3 nm. We observed a region of granulation near a pore, close to disk center that showed many structures with enhanced G-band intensity. We introduce a Bright Point Index (BPI) defined by the ratio of the normalized line depressions of the Fe II and the CH-line. The BPI allows to characterize the bright structures by a quantity based on their spectroscopic signature. Bright structures, caused by significant weakening (up to 40% less absorption) of the absorption lines of the CH-molecule, have high BPI values and are accompanied by downflows. The remaining G-band bright structures, only caused by an enhanced continuum intensity, have low BPI and are related to granules.

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