Effects of the Lipetsk Meteoroid in the Geomagnetic Field

Observational data from the Kiev (Ukraine), Borok, St. Petersburg, Hel (Poland), Arti, Novosibirsk, Almaty (Kazakhstan), and Irkutsk magnetic observatories are used to analyze the temporal variations of the geomagnetic field components on day of the Lipetsk meteoroid fall (June 21, 2018) and on reference days (June 20 and 22, 2018). The distance R from the place of explosion-like energy release by the meteoroid to the observatories varied from 0.584 to 4.324 Mm. The passage of the Lipetsk meteoroid in the magnetosphere and atmosphere turned out to be accompanied by variations mainly in the H component of the geomagnetic field. The magnetic effect was observed 54–56 min before the meteoroid explosion; the amplitude and duration of geomagnetic field disturbances did not exceed 0.5–1 nT and ~25 min, respectively. After a meteoroid explosion with a delay of 6–8 to 13–14 min for R from 0.584 to 4.324 Mm, alternating bursts (first, positive and, then, negative) in the H component. The burst amplitude decreased from 3.75 to 1.1 nT with an increase in R from 0.584 to 4.324 Mm. In this case, the duration of the magnetic effect varied for all distances within 15–20 min. Theoretical models of the observed magnetic effects are proposed, and their theoretical estimates are made. The results of observations and estimates are in good agreement with each other.