Abstract

A new system called the solar limbograph has been developed. This is a new reflective optical telescope with the best possible thermal properties, intended for high-accuracy measurements of the temporal variations of the shape of the limb and the diameter of the disk of the sun, as well as of the fine structure of individual active and quiet regions of the sun from on board a spacecraft. The optical system of the solar limbograph simulates an annular solar eclipse with an artificial moon mounted obliquely at the intermediate focus of its primary mirror.

Sky brightness and color measurements during the 21 August 2017 total solar eclipse

Donald G. Bruns and Ronald D. Bruns
Appl. Opt. 57(16) 4590-4594 (2018)

Eclipse Instrumentation for the Solar Corona

D. H. Menzel and J. M. Pasachoff
Appl. Opt. 9(12) 2626-2630 (1970)

Lunar eclipse photometry: absolute luminance measurements and modeling

Nina Hernitschek, Elmar Schmidt, and Michael Vollmer
Appl. Opt. 47(34) H62-H71 (2008)

Solar Diameter Monitor: an instrument to measure long-term changes

T. M. Brown, D. F. Elmore, L. Lacey, and H. Hull
Appl. Opt. 21(19) 3588-3596 (1982)

Observations of Solar and Lunar Radiation at 1.5 Millimeters

William M. Sinton
J. Opt. Soc. Am. 45(11) 975-979 (1955)