R Rudy Parra
Back to my work
First Author

Variability of H-alpha Line Observed at High Spectral Resolution in the Solar Atmosphere

Rudy Parra

National Solar Observatory / University of Colorado Boulder · 2020 · Instruments: ISS, SOLIS · Funding: NASA NAS5-97045 (SORCE), NSF, NSO, AURA · Mentor: Serena Criscuoli (NSO)

Research poster: Variability of H-alpha Line Observed at High Spectral Resolution in the Solar Atmosphere

Abstract

We analyzed temporal variations of the properties of the Hα line in sun-as-a-star observations. The goal is to understand how magnetic photospheric and chromospheric features modulate the variations of the Hα core-to-wing ratio at the 27-day rotational time-scale.

We find that sunspot area modulates the shape of Hα the most, while faculae and filaments have little or negligible effects. These results are of relevance to understanding chromospheric variability in solar-like stars and have implications for exoplanet habitability research.

Data acquired by SOLIS instruments operated by NISP / NSO / AURA / NSF. Supported by NASA contract NAS5-97045 (SORCE) at the University of Colorado, the National Solar Observatory, and the Research Experience for Undergraduates.