Measurements of the granule-intergranular lane contrast at 5200 A and 6300 A

Details Measurements of the granule-intergranular lane contrast at 5200 A and 6300 A Measurements of the granule-intergranular lane contrast at 5200 A and 6300 A

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...76..129a&link_type=abstract

Solar Physics, vol. 76, Feb. 1982, p. 129-136.

Physics

4

Image Contrast, Photosphere, Solar Granulation, Solar Instruments, Astronomical Photography, Data Reduction, Solar Cycles, Solar Spectra, Telescopes, Two Dimensional Models

Scientific paper

Measurements are presented of the granule-intergranular lane intensity ratio at 5200 A and 6300 A, at the center of the disk. The observations were made at the Pic du Midi and Sacramento Peak observatories between 1967 and 1978. The contrast at 5200 A is corrected for the effect of instrumental profile using a two-dimensional model. At 6300 A and in one photograph, the measurements give an average contrast of 1.40, whereas the values at 5200 A show a variation with time, the highest corrected values being in the range of 1.30 to 1.37. The possible origins of the time variation are considered.

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