A Solar cycle correlation of coronal element abundances in Sun-as-a-star observations

被引：30

作者：

Brooks, David H. ^{[1
,6
]}

Baker, Deborah ^{[2
]}

van Driel-Gesztelyi, Lidia ^{[2
,3
,4
]}

Warren, Harry P. ^{[5
]}

机构：

[1] George Mason Univ, Coll Sci, 4400 Univ Dr, Fairfax, VA 22030 USA

[2] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[3] UPMC Univ Paris 06, Univ Paris Diderot, CNRS, LESIA Observ Paris, F-92195 Paris, France

[4] Hungarian Acad Sci, Konkoly Observ, H-1121 Budapest, Hungary

[5] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

[6] ISAS JAXA, Hinode Team, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

关键词：

EMISSION MEASURE DISTRIBUTIONS; ACTIVE-REGION; HELIUM ABUNDANCE; ATOMIC DATABASE; WIND; NEON; FRACTIONATION; EVOLUTION; FIP; VARIABILITY;

D O I：

10.1038/s41467-017-00328-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The elemental composition in the coronae of low-activity solar-like stars appears to be related to fundamental stellar properties such as rotation, surface gravity, and spectral type. Here we use full-Sun observations from the Solar Dynamics Observatory, to show that when the Sun is observed as a star, the variation of coronal composition is highly correlated with a proxy for solar activity, the F10.7 cm radio flux, and therefore with the solar cycle phase. Similar cyclic variations should therefore be detectable spectroscopically in X-ray observations of solar analogs. The plasma composition in full-disk observations of the Sun is related to the evolution of coronal magnetic field activity. Our observations therefore introduce an uncertainty into the nature of any relationship between coronal composition and fixed stellar properties. The results highlight the importance of systematic full-cycle observations for understanding the elemental composition of solar-like stellar coronae.

引用

页数：7

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