# Continuum emission enhancements and penumbral changes observed during flares by IRIS, ROSA, and Hinode

## TL;DR

This study combines satellite and ground-based observations to analyze continuum emission enhancements and penumbral changes during two solar flares, highlighting the role of sunspot evolution in flare triggering.

## Contribution

It provides new insights into the relationship between sunspot penumbra disappearance and flare activity through multi-instrument observations.

## Key findings

- Continuum enhancements observed during flares in IRIS spectra and ROSA images.
- Disappearance of penumbra associated with sunspot evolution.
- Sunspot changes linked to flare triggering mechanisms.

## Abstract

In this paper we describe observations acquired by satellite instruments (Hinode/SOT and IRIS) and ground-based telescopes (ROSA@DST) during two consecutive C7.0 and X1.6 flares occurred in active region NOAA 12205 on 2014 November 7. The analysis of these data show the presence of continuum enhancements during the evolution of the events, observed both in ROSA images and in IRIS spectra. Moreover, we analyze the role played by the evolution of the $\delta$ sunspots of the active region in the flare triggering, indicating the disappearance of a large portion of penumbra around these sunspots.