Energy release from impacting prominence material following the 2011 June 7 eruption

TL;DR

This study investigates the energy release mechanisms during a partial solar filament eruption on June 7, 2011, revealing that plasma compression primarily causes observed brightenings upon impacting falling material.

Contribution

It provides a detailed analysis of the energy release process during a filament eruption, distinguishing plasma compression as the main mechanism behind observed brightenings.

Findings

Kinetic energy of impacting material ranged from 7.6 x 10^26 to 5.8 x 10^27 ergs.

Radiative energy emitted was between 1.9 x 10^25 and 2.5 x 10^26 ergs.

Energy analysis indicates plasma compression as the dominant brightening mechanism.

Abstract

Solar filaments exhibit a range of eruptive-like dynamic activity, ranging from the full or partial eruption of the filament mass and surrounding magnetic structure as a coronal mass ejection (CME), to a fully confined or 'failed' eruption. On 2011 June 7, a dramatic partial eruption of a filament was observed by multiple instruments on SDO and STEREO. One of the interesting aspects of this event is the response of the solar atmosphere as non-escaping material falls inward under the influence of gravity. The impact sites show clear evidence of brightening in the observed EUV wavelengths due to energy release. Two plausible physical mechanisms explaining the brightening are considered: heating of the plasma due to the kinetic energy of impacting material compressing the plasma, or reconnection between the magnetic field of low-lying loops and the field carried by the impacting material. By analyzing the emission of the brightenings in several SDO/AIA wavelengths, and comparing the kinetic energy of the impacting material (7.6 x 10^26 - 5.8 x 10^27 ergs) to the radiative energy (1.9 x 10^25 - 2.5 x 10^26 ergs) we find the dominant mechanism of energy release involved in the observed brightening is plasma compression.