“…Due to an anomalous (up to 25%) absorption increase in the He i 10830Å line, we identified this flare as a negative flare (Kobanov et al 2018). Such solar events are rarely observed (Henoux et al 1990;Xu et al 2016), and a study of oscillation processes related to this flare, which is the aim of the paper, is of great interest. To the best of our knowledge, for such events has been presented no observational data that includes oscillations of Doppler velocity, intensity, profile half-width, and LOS magnetic field strength.…”