A Catalog of Solar Flare Events Observed by the SOHO/EIT

TL;DR

This paper presents a comprehensive catalog of solar flares observed by SOHO/EIT and GOES from 1997 to 2010, addressing data gaps and enhancing flare detection methods for solar activity analysis.

Contribution

The study introduces a new catalog combining SOHO/EIT and GOES data, with improved detection techniques considering image cadence and error monitoring, covering most of Solar Cycle 23.

Findings

Catalog includes data from 1997-2010 covering Solar Cycle 23.

Enhanced flare detection method using EUV image subtraction.

Addresses data gaps due to low EIT cadence.

Abstract

We have compiled a catalog of solar flares as observed by the Extreme ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO) spacecraft and the GOES spacecraft over a span from 1997 to 2010. During mid-1998, the cadence of EIT images was revised from two images per day to 12 minutes. However, the low temporal resolution causes significant data gaps in capturing much of the flaring phenomenon. Therefore, we monitor possible errors in flare detection by flare parameters such as temporal overlap, observational wavelength, and considering full field of view (FOV) images. We consider the GOES flare catalog as the primary source. We describe the technique used to enhance the GOES detected flares using the Extreme Ultraviolet (EUV) image captured by the EIT instrument. In order to detect brightenings, we subtract the images with a maximum cadence of 25 minutes. We have downloaded and analyzed the EIT data via the Virtual Solar Observatory (VSO). This flare dataset from the SOHO/EIT period proves indispensable to the process of the solar flare predictions as the instrument has covered most of Solar Cycle 23.