# Plasma Brightenings in a Failed Solar Filament Eruption

## TL;DR

This study analyzes a failed solar filament eruption, revealing complex plasma brightenings caused by magnetic reconnection, energy dissipation, and plasma rarefaction, providing insights into the heating mechanisms during such solar events.

## Contribution

It presents detailed observations of plasma brightenings and identifies multiple heating mechanisms involved in a failed filament eruption, which were not previously documented in such detail.

## Key findings

- Filament material brightens and flows along magnetic field lines.
- Magnetic reconnection heats plasma to coronal temperatures.
- Different brightenings are caused by distinct heating processes.

## Abstract

Failed filament eruptions are solar eruptions that are not associated with coronal mass ejections. In a failed filament eruption, the filament materials usually show some ascending and falling motions as well as generate bright EUV emissions. Here we report a failed filament eruption that occurred in a quiet-Sun region observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. In this event, the filament spreads out but gets confined by the surrounding magnetic field. When interacting with the ambient magnetic field, the filament material brightens up and flows along the magnetic field lines through the corona to the chromosphere. We find that some materials slide down along the lifting magnetic structure containing the filament and impact the chromosphere to cause two ribbon-like brightenings in a wide temperature range through kinetic energy dissipation. There is evidence suggesting that magnetic reconnection occurs between the filament magnetic structure and the surrounding magnetic fields where filament plasma is heated to coronal temperatures. In addition, thread-like brightenings show up on top of the erupting magnetic fields at low temperatures, which might be produced by an energy imbalance from a fast drop of radiative cooling due to plasma rarefaction. Thus, this single event of failed filament eruption shows existence of a variety of plasma brightenings that may be caused by completely different heating mechanisms.