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Title:
One solar cycle of solar astrometry with MDI/SOHO
Authors:
Emilio, Marcelo; Kuhn, Jeff R.; Bush, Rock I.
Affiliation:
AA(Observatório Astronômico-Departamento de Geociências Universidade Estadual de Ponta Grossa, Paraná, Brazil ), AB(Institute for Astronomy, University of Hawaii, Woodlawn Dr. 96822, HI, USA ), AC(Solar Physics Group, Stanford University, Stanford, CA, 94305, USA )
Publication:
Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 264, p. 21-32
Publication Date:
02/2010
Origin:
CUP
Keywords:
Sun: fundamental parameters, (Sun:) solar-terrestrial relations, Sun: oscillations, Sun: photosphere
DOI:
10.1017/S1743921309992304
Bibliographic Code:
2010IAUS..264...21E

Abstract

In this work we describe the method and results of precise solar astrometry made with the Michelson Doppler Imager (MDI), on board the Solar and Heliospheric Observatory (SOHO), during one complete solar cycle. We measured an upper limit to the solar radius variation, the absolute solar radius value and the solar shape. Our results are 22 mas peak-to-peak upper limit for the solar radius variation over the solar cycle, the absolute radius was measured as 959.28 ± 0.15 arcsec at 1 AU and the difference between polar and equatorial solar radii in 1997 was 5 km and about three times larger in 2001.

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