Balloon-borne imagery of the solar granulation. IV - The centre-to-limb variation of the intensity fluctuations

Details Balloon-borne imagery of the solar granulation. IV - The centre-to-limb variation of the intensity fluctuations Balloon-borne imagery of the solar granulation. IV - The centre-to-limb variation of the intensity fluctuations

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..319d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 2, July 1983, p. 319-325.

Astronomy and Astrophysics

Astrophysics

20

Astronomical Photography, Balloon-Borne Instruments, Luminous Intensity, Solar Granulation, Atmospheric Effects, Modulation Transfer Function, Optical Correction Procedure, Power Spectra, Solar Limb

Scientific paper

A reanalysis of the white-light photographs of the granulation obtained during the flight of the balloon-borne Spektrostratoskop experiment is presented. A detailed examination of the power spectra of the intensity fluctuations at various times during the flight reveals a steady increase in a straylight and a substantial degree of astigmatism that changed with the focus setting. Allowing for the latter and normalizing all measurements to that with the least straylight, the rms relative intensity fluctuation at the center of the disk at 556 nm is increased from the previously reported value of 8.6 percent to 11.3 percent. The overall change of rms fluctuation from the center of the disk to 0.3 micron is remarkably small, dropping some 10 percent. The results agree quite well with those of the Soviet Solar Stratospheric Observatory, when corrected roughly for instrumental degradation, and with a granulation model in which the granular temperature perturbation cuts off at a height of 35 km in the atmosphere.

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