Irregular Geomagnetic Pulsations within 0.5-5 Hz Range at L ∼ 3-4

Abstract

At the Yakut chain stations in the subauroral zone (L ∼ 3-4) Pil pulsations within 0.5-5 Hz frequency range have been revealed by the active band-pass filters. They are observed during intense geomagnetic disturbances (K≥ 4) in the interval of night-dawn hours on a background of Pi 1 B and Pi 1 C, and can be accompaniedby auroral pulsations in this frequency range. Main spatial-temporal characteristics of the high-frequency geomagnetic pulsations are presented and their possible sources are discussed.