Center-to-Limb Variations of Small-Scale Magnetic Features

Details Center-to-Limb Variations of Small-Scale Magnetic Features Center-to-Limb Variations of Small-Scale Magnetic Features

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0804d&link_type=abstract

American Astronomical Society, SPD Meeting #31, #08.04; Bulletin of the American Astronomical Society, Vol. 32, p.840

Astronomy and Astrophysics

Astronomy

Scientific paper

During August/September 1999, we observed continuum images in the visible (520 nm) and infrared (1600 nm) of various active regions during their limb-to-limb passage. The images were obtained with the 65 cm vacuum reflector of the Big Bear Solar Observatory and speckle masking has been applied to obtain almost diffraction limited images of small-scale magnetic features such as pores, magnetic knots, and faculae. The infrared images were taken with a new 320 x 240 pixel, 12-bit, 30 fps InGaAs CCD camera. The continuum images are complemented by videomagnetograms obtained at Ca I (610.3 nm) with the 25 cm vacuum refractor. We present the first results of a comprehensive study on the relationship of magnetic field strength and continuum contrast of small-scale magnetic features as a function of disk position. The underlying mechanism of small-scale flux tubes is of particular importance for solar irradiance variations over the 11 year solar activity cycle.

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