On a small-scale EUV wave: the driving mechanism and the associated oscillating filament

TL;DR

This study reports on a small-scale EUV wave triggered by a mini-filament eruption, revealing its propagation characteristics, interaction with remote filaments, and its driving mechanism as a fast-mode magnetosonic wave, with implications for understanding miniature solar eruptions.

Contribution

It demonstrates that small-scale EUV waves share similar driving mechanisms and observational features with larger-scale waves, expanding understanding of solar eruptive phenomena.

Findings

EUV wave speed was 182 km/s with deceleration and reflection observed.

The wave caused transverse oscillation of a remote filament with a 15-minute period.

Magnetic field strength near the filament was estimated at about 7 Gauss.

Abstract

We present observations of a small-scale Extreme-ultraviolet (EUV) wave that was associated with a mini-filament eruption and a GOES B1.9 micro-fare in the quiet Sun region. The initiation of the event was due to the photospheric magnetic emergence and cancellation in the eruption source region, which first caused the ejection of a small plasma ejecta, then the ejecta impacted on a nearby mini-filament and thereby led to the filament's eruption and the associated fare. During the filament eruption, an EUV wave at a speed of 182 { 317 km/s was formed ahead of an expanding coronal loop, which propagated faster than the expanding loop and showed obvious deceleration and refection during the propagation. In addition, the EUV wave further resulted in the transverse oscillation of a remote filament whose period and damping time are 15 and 60 minutes, respectively. Based on the observational results, we propose that the small-scale EUV wave should be a fast-mode magnetosonic wave that was driven by the the expanding coronal loop. Moreover, with the application of filament seismology, it is estimated that the radial magnetic field strength is about 7 Gauss. The observations also suggest that small-scale EUV waves associated with miniature solar eruptions share similar driving mechanism and observational characteristics with their large-scale counterparts.