Continuum photometry of solar white-light faculae

Details Continuum photometry of solar white-light faculae Continuum photometry of solar white-light faculae

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..189...57s&link_type=abstract

Solar Physics, v. 189, Issue 1, p. 57-68 (1999).

Physics

12

Scientific paper

We have determined absolute continuum intensities and brightness temperatures of individual facular grains at a spatial resolution limited by the φ=50 cm aperture of the SVST on La Palma. A facular region at θ~57 deg was observed simultaneously in three narrow continuum windows at 450.5, 658.7, and 863.5 nm. We corrected for image degradation by the Earth's atmosphere using the speckle masking method. The brightness temperatures do not exactly follow the Planck law. The differences of T_blue-T_red=220 K and T_ir-T_red=-42 K reflect the wavelength dependence of the continuum formation depth. The (red) temperatures of 250 facular grains show excesses between 250 and 450 K above their undisturbed neighborhood. The wavelength dependence of the relative intensity ratios C_λ=[I^fac/I^phot]_λ show a large scatter around mean values of C_blue/C_red=1.075 and C_ir/C_red=0.98. We determined the center-to-limb variation of the 863.5 nm continuum contrast for 0.17

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