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A Solar cycle correlation of coronal element abundances in Sun-as-a-star observations View all abstracts by submitter

David Brooks   Submitted: 2017-08-30 20:26

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.

Authors: David H. Brooks, Deborah Baker, Lidia van Driel-Gesztelyi, Harry P. Warren
Projects: SDO-EVE

Publication Status: Published in Nature Communications, 8, 183 (2017)
Last Modified: 2017-08-31 09:34
Go to main E-Print page  Time variations of observed Hα line profiles and precipitation depths of non-thermal electrons in a solar flare   A Database of Flare Ribbon Properties from the Solar Dynamics Observatory. I. Reconnection Flux  Edit Entry  Download Preprint  Delete Entry 

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