Limb Shift of the Fe I 6569 Å Line on the Sun
Abstract
Abstract The convective motions of solar granules generate a center-to-limb variation of Doppler velocity in the photospheric lines, known as the limb shift effect. This study presents a comprehensive analysis of this effect for the Fe I 6569 Å line using both observational data from the Chinese H α Solar Explorer (CHASE) mission and numerical simulations from the Bifrost code. We employ two independent methods to derive the limb shift curve: a spectral-averaging method (Method 1) and a velocity-averaging method (Method 2). By comparing synthetic and observed data, we determine the convective blueshift, which is not accounted for in the CHASE observations. The simulations reproduce the observed trends for both methods at the instrument’s spatial resolution (=1 . ″ 2). However, at resolutions below
Fields of Study & Subjects
Solar and Space Plasma Dynamics
Ionosphere and magnetosphere dynamics
Solar Radiation and Photovoltaics
Publication details
- Journal / source
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Volume
- 998
- Issue
- 1
- Pages
- 145–145
- Publication date
- 6 February 2026
- Language
- EN