High resolution photographs of the sun near 200 NM

Details High resolution photographs of the sun near 200 NM High resolution photographs of the sun near 200 NM

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63...35h&link_type=abstract

Solar Physics, vol. 63, Aug. 1979, p. 35-60. Centre National d'Etudes Spatiales

Physics

9

Astronomical Photography, Balloon-Borne Instruments, Solar Atmosphere, Solar Granulation, Telescopes, High Resolution, Photographs, Signal To Noise Ratios, Solar Observatories, Solar Simulation, Surface Properties, Temperature Dependence, Ultraviolet Spectra

Scientific paper

A balloon-borne telescope was flown two times at altitudes above 30 km to obtain high-resolution pictures of the sun at 200, 210, 310, and 460 nm. The 460- and 310-nm pictures exhibited solar granulation with an intergranular contrast. Facular granules were clearly visible near the solar limb; however, on the 310-nm pictures facular granules were observed even at the center of the disk. In the UV (200 nm), the appearance was quite different from that in the visible: the surface of the sun was covered by many bright granules with a diameter of the order of 1 arcsec. A statistical study of these granules made it possible to derive a facular-granule model with a temperature excess of 180 K with respect to the surrounding photosphere starting at a height of 180 km.

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