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Statistics of Solar Filament Mass based on CHASE Sun-as-a-star Spectroscopic Observations

Authors: Xie, Tianyi; Zhao, Zhanhao; Cheng, Xin; Chen, Yuehong; Zheng, Zhi; Hao, Qi; Li, Chuan; +1 Authors

Statistics of Solar Filament Mass based on CHASE Sun-as-a-star Spectroscopic Observations

Abstract

We present a statistical study of solar filament mass based on Sun-as-a-star Hα spectroscopic observations from the CHASE (Chinese Hα Solar Explorer) mission. Using a cloud model radiative transfer approach combined with non-LTE ionization corrections, we estimated the masses of 1,571 solar filaments. The median filament mass is 1.5×10¹² kg. We find a near-linear scaling relation between filament mass and the equivalent width variation (|ΔEW|) in Sun-as-a-star spectra (r=0.91), providing an empirical calibration formula for inferring stellar filament/prominence masses from disk-integrated spectroscopic observations. The 3D morphology of filaments yields a length:width:depth ratio of 4.5:1:1.7. This work is presented as a poster at Cool Stars 23 (Tokyo, June 2026).

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