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Proceedings Paper

APT: an astrometric and photometric telescope
Author(s): Jeff R. Kuhn; Rock I. Bush; Roy Coulter; Claus Froehlich; Dz-Hung Gwo; A. Jones; Judit M. Pap; Philip H. Scherrer; Sabatino Sofia; Roger Ulrich
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Paper Abstract

Helioseismic and precise solar photometric measurements reveal that the Sun varies globally as a start during the source of an 11 year solar cycle. To understand the physical mechanisms of the magnetic cycle in the solar interior we must learn how to measure the tiny changes in the Sun's global properties, like its radius, internal temperature distribution and surface luminosity. The SoHO/MDI experimental has proven that exceedingly small solar shape fluctuations are measurable from outside our atmosphere. We describe here an instrument which will not only measure limb shape oscillations with unprecedented accuracy, but it will also detect solar radius changes with heretofore unachieved accuracy and precision. Variations in these parameters are caused by physical changes, both in the photosphere and the deep solar interior. Solar radius and shape observations will teach us how the Sun's convective envelope responds to emergent energy fluctuations. The determination of this outer boundary condition is essential to understand the solar total irradiance and luminosity variations.

Paper Details

Date Published: 2 November 1998
PDF: 7 pages
Proc. SPIE 3442, Missions to the Sun II, (2 November 1998); doi: 10.1117/12.330257
Show Author Affiliations
Jeff R. Kuhn, Michigan State Univ. and National Solar Observatory (United States)
Rock I. Bush, Stanford Univ. (United States)
Roy Coulter, National Solar Observatory (United States)
Claus Froehlich, World Radiation Ctr. (Switzerland)
Dz-Hung Gwo, Stanford Univ. (United States)
A. Jones, Univ. of Southern California and Univ. of California/Los Angeles (United States)
Judit M. Pap, Univ. of California/Los Angeles (United States)
Philip H. Scherrer, Stanford Univ. (United States)
Sabatino Sofia, Yale Univ. (United States)
Roger Ulrich, Univ. of California/Los Angeles (United States)


Published in SPIE Proceedings Vol. 3442:
Missions to the Sun II
Clarence M. Korendyke, Editor(s)

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