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Observations of solar chromospheric fine structures in the light of Lyman-α

✍ Scribed by William A. Sloan

Publisher
Springer
Year
1968
Tongue
English
Weight
806 KB
Volume
4
Category
Article
ISSN
0038-0938

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✦ Synopsis

A Cassegrain telescope with a resolution of 2 sec of arc was successfully flown in an Aerobee-150 rocket from White Sands Missile Range on October 20, 1965. A pinhole, 33/t in diameter, was placed at the focus of the telescope, followed by a photo-ionization detector with a lithium-fluoride window. The instrument was kept pointed at the sun by a biaxial solar pointing control.

Results indicate that in Lyman-c~ the solar surface shows structures whose characteristic dimensions can be as small as 2 sec of arc, which corresponds to the limit of instrumental resolution. Larger structures with very sharp gradients have also been found. Intensity ratios between bright and dark areas are typically a factor of 1.7. Isophote maps of two small selected areas are discussed in this paper. The results were obtained in an undisturbed (free of plages) portion of the solar disk.

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