Measurements of the granule-intergranular lane contrast at 5200 Å and 6300 Å |
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Authors: | C E Alissandrakis C J Macris Th G Zachariadis |
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Institution: | (1) Laboratory of Astrophysics, University of Athens, Panepistimiopolis, 621 Athens, Greece;(2) Research Center for Astronomy and Applied Mathematics, Academy of Athens, 14 Anagnostopoulou Street, 136 Athens, Greece |
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Abstract: | We present measurements of the granule-intergranular lane intensity ratio at 5200 Å and 6300 Å, at the center of the disk. The observations were obtained at Pic du Midi and Sacramento Peak observatories between 1967 and 1978. The contrast at 5200 Å was corrected for the effect of instrumental profile using a two-dimensional model. At 6300 Å and in one photograph our measurements gave an average contrast of 1.40, while the values at 5200 Å show a variation with time, with the highest corrected values in the range of 1.30 to 1.37. The possible origins of the time variation are discussed. |
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