Geoelectromagnetic Oscillations

Abstract

A hundred years have passed since the outstanding scientist Professor V.A. Troitskaya was born. This paper is dedicated to her centenary. It discusses her scientific contributions to studying ultralow frequency oscillations of the Earth’s electromagnetic field. The discussion covers permanent and sporadic oscillations, “pearl necklace,” pulsations of increasing frequency, specific oscillations observed in the Arctic and Antarctic. The paper also describes the current state of the scientific problems that were Professor Troitskaya’s focus of interest. Particular attention is given to the key role of the interplanetary magnetic field in forming the spatial-temporal structure of oscillations.