Multi-color photometric observations of facular contrasts

Details Multi-color photometric observations of facular contrasts Multi-color photometric observations of facular contrasts

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..116...17l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 116, no. 1, 1988, p. 17-32.

Physics

28

Astronomical Photometry, Faculae, Solar Limb, Photosphere, Solar Position, Solar Spectra

Scientific paper

The author has analyzed high-resolution, digital, photometric images of solar active regions made at various center-limb positions on 21 - 24 July, 1983. The images were made at three continuum wavelengths: 5245 Å, 6264 Å, 10000 Å, and also at 8662 Å in the Ca II infrared line. In all continuum colors, the contrasts of facular patches, as opposed to individual facular elements, appear to behave as linear functions of 1/cos θ, where θ is the heliocentric angle (μ = 0 at the limb, 1 at disk center). The relative contrasts in the different continuum colors are roughly proportional to (wavelength)-1, as expected from a Planck distribution in the Wien approximation. The observed variation of the relative contrasts with center-limb position is compared to two simple theoretical models.

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