A Simple One-free-parameter Model of the Solar Chromosphere Explains Solar Chromospheric Line Variations Measured by NEID at WIYN during the 2023 October Solar Eclipse

Research Notes of the AAS 2026 Open access

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Authors: Jason T. Wright, Elizabeth B. Gonzalez, Pranav H. Premnath, Paul M. Robertson, Suvrath Mahadevan, Arvind F. Gupta, Samuel Halverson, Daniel M. Krolikowski, Sarah E. Logsdon, Jacob K. Luhn, Joe Philip Ninan, Michael L. Palumbo
+3 more Arpita Roy, Christian Schwab, Ryan C. Terrien
DOI: 10.3847/2515-5172/ae3822
Cited by: 0
References: 7

Abstract

Abstract We have modeled H α equivalent width and Ca ii H & K S index measurements of disk-integrated sunlight during the 2023 October solar eclipse as measured by NEID using a one-free-parameter analytic model of the Sun, where the line is in absorption in the solar disk and in emission on the limb. We find the model to be in reasonable qualitative agreement with our data, and to explain the apparent strengthening of the absorption lines at beginning and end of eclipse. We suggest such a model might have utility in analyses of chromospheric lines in eclipsing binaries.

Fields of Study & Subjects

Solar and Space Plasma Dynamics Stellar planetary and galactic studies History and Developments in Astronomy

Publication details

Journal / source
Research Notes of the AAS
Volume
10
Issue
1
Pages
14–14
Publication date
16 January 2026