Multi-wavelength observations of a B-class flare using XSM, AIA, and XRT

TL;DR

This study combines data from XSM, AIA, and XRT to analyze a B-class solar microflare, revealing consistent temperature measurements, high-temperature loops, and elemental abundance changes during the event.

Contribution

It provides a comprehensive multi-wavelength analysis of a B-class microflare, demonstrating the effectiveness of combined observations in understanding flare properties.

Findings

Temperatures of 10 MK in hot loops are confirmed across instruments.

Elemental abundances decrease to photospheric levels at flare peak.

Excellent agreement within 20% for temperature measurements from different instruments.

Abstract

We present multi-wavelength observations by Chandrayaan-2/XSM, SDO/AIA and Hinode/XRT of a B-class flare observed on 25th February, 2021, originating from an active region (AR 12804) near the North-West limb. The microflare lasts for approx 30 mins and is composed of hot loops reaching temperatures of 10 MK. We report excellent agreement (within 20 percent) for the average effective temperatures obtained at the flare peak from all the three instruments, which have different temperature sensitivities. The XRT filter combination of Be-thin and Be-med provides an excellent opportunity to measure the high-temperatures in such microflare events. The elemental abundances during the evolution of the microflare are also studied and observed to drop towards photospheric values at the flare peak time, compared to coronal values during the rise and decay phase. This is consistent with previous XSM studies.