Hydrodynamics of small transient brightenings in Solar corona

Abstract

Small scale transients occur in the Solar corona at much higher frequencies than flares and play a significant role in coronal dynamics. Here we study three well-identified transients discovered by Hi-C and also detected by the EUV channels of Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO). We use 0-D enthalpy-based hydrodynamical simulations and produce synthetic light curves to compare with AIA observations. We have modeled these transients as loops of ~ 1.0~Mm length depositing energies ~ 10^23 ergs in ~ 50 seconds. The simulated synthetic light curves show reasonable agreement with the observed light curves. During the initial phase, conduction flux from the corona dominates over the radiation, like impulsive flaring events. Our results further show that the time-integrated net enthalpy flux is positive, hence into the corona. The fact that we can model the observed light curves of these transients reasonably well by using the same physics as those for nanoflares, microflares, and large flares, suggests that these transients may have a common origin.

Published in ApJ, 16 pages, 13 figures, and 3 tables

References in corpus (7)

• The Solar Orbiter mission -- Science overview
• Highly Efficient Modeling of Dynamic Coronal Loops
• Key Aspects of Coronal Heating
• RHESSI Microflare Statistics II. X-ray Imaging, Spectroscopy & Energy Distributions
• A nanoflare model of quiet Sun EUV emission
• Fan Loops Observed by IRIS, EIS and AIA
• On the Impulsive Heating of Quiet Solar Corona

Cited by in corpus (3)

• Synchronization of Small-scale Magnetic Features, Blinkers, and Coronal Bright Points
• Nanoflare Heating of the Solar Corona Observed in X-rays
• Flows in Enthalpy Based Thermal Evolution of Loops