Formation of Transient Coronal Holes during Eruption of a Quiescent Filament and its Overlying Sigmoid

TL;DR

This study analyzes a quiet-sun filament eruption that caused transient coronal holes, flare-like ribbons, and a CME, providing insights into the magnetic flux rope model and the formation of transient coronal holes during eruptions.

Contribution

It presents detailed multi-wavelength observations of a filament eruption, highlighting the formation of transient coronal holes and their association with flux rope footpoints, advancing understanding of solar eruptions.

Findings

Two transient coronal holes formed at the ends of the eruptive sigmoid.

Brightenings appeared at TCH locations during early eruption phases.

Eruption explained by magnetic flux rope model with TCHs as flux rope feet.

Abstract

By using H$\alpha$, He I 10830, EUV and soft X-ray (SXR) data, we examined a filament eruption that occurred on a quiet-sun region near the center of the solar disk on 2006 January 12, which disturbed a sigmoid overlying the filament channel observed by the $\emph{GOES-12}$ SXR Imager (SXI), and led to the eruption of the sigmoid. The event was associated with a partial halo coronal mass ejection (CME) observed by the Large Angle and Spectrometric Coronagraphs (LASCO) on board the Solar and Heliospheric Observatory ($\emph{SOHO}$), and resulted in the formation of two flare-like ribbons, post-eruption coronal loops, and two transient coronal holes (TCHs), but there were no significantly recorded $\emph{GOES}$ or H$\alpha$ flares corresponding to the eruption. The two TCHs were dominated by opposite magnetic polarities and were located on the two ends of the eruptive sigmoid. They showed similar locations and shapes in He I 10830, EUV and SXR observations. During the early eruption phase, brightenings first appeared on the locations of the two subsequent TCHs, which could be clearly identified on He I 10830, EUV and SXR images. This eruption event could be explained by the magnetic flux rope model, and the two TCHs were likely to be the feet of the flux rope.