A Study of a long duration B9 flare-CME event and associated piston-driven shock

TL;DR

This paper analyzes a long-duration B-class solar flare and CME event, highlighting the coexistence of fast and slow EUV waves, associated radio bursts, and magnetic flux changes observed by multiple solar instruments.

Contribution

It provides detailed multi-instrument observations of a solar flare-CME event, emphasizing the coexistence of different EUV wave types and their relation to magnetic field evolution.

Findings

Coexistence of fast and slow EUV waves during the event

Detection of a type II radio burst with harmonic components

Magnetic flux emergence and cancellation prior to eruption

Abstract

We present and discuss here the observations of a small long duration GOES B- class flare associated with a quiescent filament eruption, a global EUV wave and a CME on 2011 May 11. The event was well observed by the Solar Dynamics Observatory (SDO), GONG H{\alpha}, STEREO and HiRAS spectrograph. As the fil- ament erupted, ahead of the filament we observed the propagation of EIT wave fronts, as well as two flare ribbons on both sides of the polarity inversion line (PIL) on the solar surface. The observations show the co-existence of two types of EUV waves, i.e., a fast and a slow one. A type II radio burst with up to the third harmonic component was also associated with this event. The evolution of pho- tospheric magnetic field showed flux emergence and cancellation at the filament site before its eruption.