Light curve, spectra, and AIA DEMs for weak flares observed by STIX during 2021 Sep. 20–25

Following the Neupert effect, we quantify the relative yield of X-ray emission in different energy bands. During 2021 September 20–25, the Solar Orbiter mission was closer to the Sun (∼0.6 au) and had a moderate separation angle (<40°) from the Sun–Earth line. We analysed multiwavelength emission from ∼200 (mostly weak) flares, commonly observed by the Spectrometer Telescope for Imaging X-rays (STIX), STEREO-A, GOES, and the Solar Dynamics Observatory. We identified strongly nonthermal flares by associating hard X-ray fluence (12–20 keV) and soft X-ray flux (4–10 keV) with the peak soft X-ray flux into the QF factor.We provide STIX light curves and spectrogram data with estimated QF in the dataset for all 203 analysed flares with marked time characteristics (JPEG files). For 20 selected flares, we provide GOES light curves and Differential Emission Measure estimates based on AIA data (JPEG files). The spectral data (spectrum files, spectral response matrices and fitted parameters for thermal and nonthermal components) are provided in FITS format (https://fits.gsfc.nasa.gov/fits_utility.html).