Response of a Magnetospheric Storm in the Atmospheric Electric Field of the Midlatitudes
S. V. Anisimov, N. M. Shikhova, Н. Г. Клейменова
Abstract
Abstract The response of strong magnetic storms in variations of the electric field of the near-ground atmosphere of the midlatitudes are studied according to data from long-term observations of aeroelectric (Ez) and geomagnetic fields at the midlatitude Borok Geophysical Observatory. For the period 1998–2015, 19 strong and very strong magnetic storms with a minimal Dst index of < –100 nT and a maximal index value of Kp > 7, which correspond to undisturbed meteorological conditions of the lower atmosphere (i.e., good weather conditions), are identified at Borok Observatory. The effect of a magnetic storm on changes in the electric field of the near-surface atmosphere is shown to be more efficiently manifested in the daytime around noon. A statistically significant variation in the strength of the aeroelectric field was found. It was characterized by an increase in the Ez value over a time interval of ±4 h relative to the time of the minimum of the Dst variation of the magnetic storm.