Affiliation: Physical Research Laboratory
Conference ID : ASI2022_752
Title : Role of small-scale impulsive events in heating the X-ray bright points of the Sun -- insights from Ch-2/XSM observations.
Authors : B. Mondal, S. V. Vadawale, A. Sarkar, N. P. S. Mithun, P. Janardhan, A. Bhardwaj, G. Del Zanna, H. E. Mason
Abstract Type: Poster
Abstract Category : Sun and the Solar System
Abstract : The Solar X-ray Monitor (XSM) onboard Chandrayaan 2 has observed the quiet Sun of the 24th Solar minimum with unprecedented spectral resolution. The observation has already shown that X-ray Bright Points (XBPs) present on the disk are the major source of hot (~2 MK) emissions of the quiet Sun. Several microflares (energy range between ~3.0e26 and 6.0e27 ergs) have also been observed during this quiet period of the Sun. The majority of them originate from these XBPs. Using simultaneous observation from the AIA and XSM, we derive the Differential Emission Measure (DEM) curve of the quiet Sun and XBPs. We also numerically simulate multiple DEM curves of XBPs, assuming they are getting heated by several small-scale impulsive heating events with varying energy distributions. Comparing simulated DEMs with the observed one, we interpret that small-scale impulsive events with an energy of more than 1.0e24 erg are responsible for XBP heating, and their frequency distribution maintains a power-law index between 2.0 to 2.2.