ИСТИНА

Geomagnetic noise and pulsations at frequencies about several Hz in the ionosphere remain weakly studied. Research of Schumann and IAR features at the altitudes above the maximum of electron concentration, answer of Hertz geomagnetic fluctuations in the ionosphere to thunderstorms, are at the initial stage. Almost no results on magnetospheric control of Hertz magnetic field fluctuations in the ionosphere have been reported. Even morphological properties of background geomagnetic noise and pulsations are unknown. This makes ambiguous any interpretation of found events. The present study is aimed on study of geomagnetic fluctuations in the frequency range 3-15 Hz, recorded by SWARM satellites, including 1) Morphological properties of background fluctuations 2) Possible association with thunderstorms (observations and model) 3) Possible magnetospheric control, as estimated from synchronous SWARM and THEMIS data