nearly by a factor of two during the peak emission. Moreover, enhancement in the line width preceded that in the Doppler shift which again preceded enhancement in the intensity. The observed results were qualitatively reproduced by 1-D hydrodynamic simulations where energy was deposited at both the footpoints of a monolithic coronal loop that mimicked the ARTBs identified in the observations.'
author:
- 'G. R. Gupta, Aveek Sarkar, Durgesh Tripathi'
title: Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
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Introduction
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Active regions transient brightenings [ARTB, @1992PASJ...44L.147S] are small intense events occurring in or near the active regions and were first studied using a sequence of images recorded by the Soft X-ray Telescope [SXT, @1991SoPh..136...37T] on-board *Yohkoh*. These events are mainly found in active regions, on an average, every 3 min and have various morphologies like single-point or multiple-point brightening. ARTBs have also been observed with simultaneous multi-loop brightenings or even jets . Moreover, they have been observed as precursor to prominence eruptions , prominence oscillations etc. They may play an important role in the heating of solar corona [@1995Natur.375...42Y]. Therefore, it is imperative to fully comprehend the thermodynamics involved in such 