[Loops] Hydrodynamics of small transient brightenings in Solar corona

[Abhishek Rajhans]

Dear All,

I am Abhishek Rajhans, a graduate student at IUCAA, working under supervision of Durgesh Tripathi (IUCAA) and Vinay Kashyap (CfA). We recently got our paper "Hydrodynamics of small transient brightenings in Solar Corona" accepted in the Astrophysical Journal. In this work we have used EBTEL code, which is based on 0-D description of coronal loops, to study transient brightenings detected by Hi-C and studied using AIA by Subramanian et al 2018. We see that these brightenings can be modelled as loops of ~ 1 Mm, with energy deposition of log[E(ergs)] ~ 23 in ~ 50 seconds. We have used two approaches : [1] in which the background + transient is used for constraining input parameters for simulations and [2] in which only transient has been used. We see that the latter method works better, in terms of agreement of synthetic and observed intensities in the six AIA filters (9.4, 13.1, 17.1, 19.3, 21.1, and 33.5 nm).

It is well known that impulsive events like large flares, microflares and nanoflares, show an initial conduction dominated cooling phase followed by enthalpy flux into corona, and subsequent radiation. Their hydrodynamics can be explained well by physics that goes into EBTEL. The fact that these small transient brightenings can also be explained by same physics is suggestive of a common underlying mechanism.

Here is the arxiv link of the paper

https://arxiv.org/abs/2105.08800

I hope you enjoy reading it. I would be delighted to get your valuable feedbacks, comments, questions and suggestions.

Regards,
Abhishek Rajhans