The Catalog of Hvar Observatory Solar Observations

Abstract

We compile the catalog of Hvar Observatory (HVAR) solar observations in the time period corresponding to regular digitally stored chromospheric and photospheric observations 2010 – 2019. We make basic characterization of observed phenomena and compare them to catalogs that are based on full-disk solar images. We compile a catalog of observed active regions (ARs) consisting of 1100 entries, where each AR is classified according to McIntosh and Mt Wilson classifications. We find that HVAR observations are biased towards more frequently observing more complex ARs and observing them in longer time periods, likely related to the small field of view not encompassing the whole solar disk. In H\(\alpha \) observations, we catalog conspicuous filaments/prominences and flares. We characterize filaments according to their location, chirality (if possible), and eruptive signatures. Analysis of the eruptive filaments reveals a slight bias in the HVAR catalog towards observation of partial eruptions, possibly related to the observers’ tendency to observe filaments that already showed some activity. In the flare catalog we focus on their observed eruptive signatures (loops or ribbons) and their shape. In addition, we associate them to GOES soft X-ray flares to determine their corresponding class. We find that HVAR observations seem biased towards more frequently observing stronger flares and observing them in longer time periods. We demonstrate the feasibility of the catalog on a case study of the flare detected on 2 August 2011 in HVAR H\(\alpha \) observations and related Sun-to-Earth phenomena. Through flare–CME–ICME association we demonstrate the agreement of remote and in situ properties. The data used for this study, as well as the catalog, are made publicly available.