Work

Kinematic relationship between solar extreme ultraviolet waves and type II metric radio bursts

Year: 2026

Type: article

Abstract: Solar extreme-ultraviolet (EUV) waves are large-scale disturbances that manifest as bright wavefronts, often during coronal mass ejections (CMEs). According to the magnetic field line stretching model, this phenomenon comprises two components: a fast-mode CME piston-driven shock wave and a slower, nonwave component. They are often associated with solar type II radio bursts. It is expected the radio source and the fast-mode EUV wave should come from different parts of the same shock, i.e., the CME piston-driven shock, and their speeds should be strongly correlated. To investigate this relationship, we utilized high spatiotemporal resolution observations from the Solar Dynamics Observatory in conjunction with radio data from the Radio Solar Telescope Network. Our analysis reveals that there exists a linear correlation between the EUV fast-mode speeds ( $v_{euv}$ ) and the shock speeds derived from metric (m) type II radio bursts ( $v_{radio}$ ), which is $v_{radio}=0.89v_{euv}+51$ km s $^{-1}$ , with a correlation coefficient of 0.77. This strong correlation suggests that original coronal EIT waves, which are about three times slower than type II radio bursts, are not fast-mode waves, and it is misleading to map type II radio bursts to EIT waves in the literature.

Source: Scientific Reports

DOI: 10.1038/s41598-026-70061-z

Authors: Ramesh Chandra, Apoorv Dashora, P. F. Chen, Pooja Devi

Institutions: Kumaun University, Nanjing University, University of Oslo

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: $2,690