Work

Near-Sun Characteristics of a CME Inferred from Observations in the 5303 Å Coronal Emission Line

Year: 2025

Type: article

Abstract: Using observations of the solar corona in the 5303 Å (Fe XIV ) emission line with the Visible Emission Line Coronagraph (VELC) on board Aditya-L1, we estimated the electron density ( N e ), thermal energy ( E CME ), and mass ( M CME ) of a coronal mass ejection (CME) very close to the Sun at heliocentric distance r ≈ 1.06 R ⊙ . The corresponding values are N e ≈ 3.7 × 10 8 cm −3 , E CME ≈ 9.4 × 10 28 erg, and M CME ≈ 2.7 × 10 14 g, respectively. The procedure adopted suggests a possibility to understand the properties of the CMEs in the visible wavelength range, particularly during the temporal phase close to their onset. The widths and Doppler velocities of the line are nearly constant in the VELC field of view (FoV ≈ 1.06–1.50 R ⊙ ). The values are ≈0.85 Å and ≈+2 km s −1 , respectively.

Source: The Astrophysical Journal

DOI: 10.3847/1538-4357/ae1a47

Authors: V. Muthu Priyal, R. Ramesh, Jagdev Singh, K. Sasikumar Raja, N. Gopalswamy

Institutions: Indian Institute of Astrophysics, Goddard Space Flight Center

Language: English

Topic: Solar and Space Plasma Dynamics

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $4,499