One solar cycle of solar astrometry with MDI/SOHO

被引：1

作者：

Emilio, Marcelo ^{[1
]}

Kuhn, Jeff R. ^{[2
]}

Bush, Rock I. ^{[3
]}

机构：

[1] Univ Estadual Ponta, Dept Geociencias, Astron Observ, Grossa, Parana, Brazil

[2] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[3] Stanford Univ, Solar Phys Grp, Stanford, CA 94305 USA

来源：

SOLAR AND STELLAR VARIABILITY: IMPACT ON EARTH AND PLANETS | 2010年 / 264期

关键词：

Sun: fundamental parameters; (Sun:) solar-terrestrial relations; Sun: oscillations; Sun: photosphere; DIAMETER; CONSTANCY; RADIUS; SHAPE;

D O I：

10.1017/S1743921309992304

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：21 / +

页数：2

共 15 条

[1] Accurate determination of the solar photospheric radius [J].

Brown, TM ;

Christensen-Dalsgaard, J .

ASTROPHYSICAL JOURNAL, 1998, 500 (02) :L195-L198

[2] Does the Sun shrink with increasing magnetic activity? [J].

Dziembowski, WA ;

Goode, PR ;

Schou, J .

ASTROPHYSICAL JOURNAL, 2001, 553 (02) :897-904

[3] A changing solar shape [J].

Emilio, M. ;

Bush, R. I. ;

Kuhn, J. ;

Scherrer, P. .

ASTROPHYSICAL JOURNAL, 2007, 660 (02) :L161-L163

[4] On the constancy of the solar diameter [J].

Emilio, M ;

Kuhn, JR ;

Bush, RI ;

Scherrer, P .

ASTROPHYSICAL JOURNAL, 2000, 543 (02) :1007-1010

[5] Solar diameter measurements at Sao Paulo Observatory [J].

Emilio, M ;

Leister, NV .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 361 (03) :1005-1011

[6]

GILLILAND RL, 1980, APJ, V248, P1144

[7] Comment on "A Large Excess in Apparent Solar Oblateness Due to Surface Magnetism" [J].

Kuhn, J. R. ;

Emilio, M. ;

Bush, R. .

SCIENCE, 2009, 324 (5931)

[8] On the constancy of the solar diameter. II. [J].

Kuhn, JR ;

Bush, RI ;

Emilio, M ;

Scherrer, PH .

ASTROPHYSICAL JOURNAL, 2004, 613 (02) :1241-1252

[9] The Sun's shape and brightness [J].

Kuhn, JR ;

Bush, RI ;

Scheick, X ;

Scherrer, P .

NATURE, 1998, 392 (6672) :155-157

[10] Measurements and variations of the solar diameter [J].

Laclare, F ;

Delmas, C ;

Coin, JP ;

Irbah, A .

SOLAR PHYSICS, 1996, 166 (02) :211-229

← 1 2 →