On the Bright Loop Top Emission in Post Eruption Arcades

Abstract

The observations of post eruption arcades (PEAs) in X-rays and EUV reveal strong localised brightenings at the loop top regions. The origin of these brightenings and their dynamics is not well understood to date. Here, we study the dynamics of PEAs using one-dimensional hydrodynamic modelling with the focus on the the understanding of the formation of localised brightening.Our findings suggest that these brightenings are the result of collisions between the counter-streaming chromospheric evaporation from both the foot points. We further perform forward modelling of the emission observed in simulated results in various spectral lines observed by the Extreme-Ultraviolet Imaging Telescope aboard Hinode. The forward modelled intensities in various spectral lines are in close agreement with a flare observed in December 17, 2006 by EIS.

arXiv commentAccepted by ApJ

References in corpus (5)

• Why Is the Great Solar Active Region 12192 Flare-Rich But CME-Poor?
• Confined Flares in Solar Active Region 12192 from 2014 October 18 to 29
• Magnetohydrodynamic shocks in and above post-flare loops: two-dimensional simulation and a simplified model
• Gas-dynamic shock heating of post-flare loops due to retraction following localized, impulsive reconnection
• A Model for the Origin of High Density in Loop-top X-ray Sources

Cited by in corpus (3)

• Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
• Detection of weak ubiquitous impulsive nonthermal emissions from the solar corona
• Evolution of the Ratio of Mg II Intensities During Solar Flares