Stigmatic spectra of the sun between 1200 A and 2100 A

Details Stigmatic spectra of the sun between 1200 A and 2100 A Stigmatic spectra of the sun between 1200 A and 2100 A

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....39...71s&link_type=abstract

Astronomy and Astrophysics, vol. 39, no. 1, Feb. 1975, p. 71-81. Centre National d'Etudes Spatiales

Astronomy and Astrophysics

Astrophysics

27

Radial Distribution, Solar Spectra, Solar Temperature, Spectral Energy Distribution, Ultraviolet Spectra, Astronomical Models, Astronomical Photometry, Atmospheric Models, Calibrating, Rocket-Borne Instruments, Solar Instruments, Solar Limb, Spectroheliographs

Scientific paper

Stigmatic spectra of the sun from 1200 to 2100 A, with spatial resolution on the disk of 7 arc sec, have been obtained during a rocket flight on April 17, 1973 from Kourou, French Guiana. The mean spectral resolution achieved is 0.4A. Absolute intensities and center-to-limb variations of the solar UV continuum have been measured on both sides of the temperature minimum. They locate the position of this minimum around 1580 A with a value of 4430 (plus or minus 50) K. It is shown that these are upper limits and are not necessarily incompatible with infrared observations which lead to lower values. It is shown that an extra opacity is required to represent the observations down to, at least, 1580 A.

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