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

ABSTRACT: 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 cor

SUBMITTER: Brooks DH 

PROVIDER: S-EPMC5543058 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature