The CN Leo flare census

摘要

We investigate the frequency and amplitude distribution of flares on the actice M dwarfCN Leo observed simultaneously in coronal X-rays, chromospheric line emission, and the pho-tospheric optical continuum. We find that most of the larger events are visible in all atmosphericlayers, these are equivalent to solar white light flares. Several smaller events are only visible in thechromospheric lines, which corresponds to solar H-alpha flares. One event is very strong in X-rays,but only weak in the chromospheric lines and invisible in the photospheric continuum, indicating arather large scale height of the flaring loop. We find no obvious correlation of the flare amplitudesand decay times in the different atmospheric layers. We also search for time delays between thedifferent wavelength bands and probe the occurrence of the Neupert effect.