ИСТИНА

We present results of ground-based observations of electromagnetic low-frequency waves and optical emissions performed by Polar Geophysical Institute (PGI) at Kola Peninsula and Scandinavia during conjugate flybys of ERG/Arase spacecraft. Capabilities of the instruments are discussed and example observations are shown. A catalogue of observations for various types of phenomena is briefly characterized. In particular, we observe pulsating auroras and try to triangulate them in order to determine their altitude. These results can be compared with ERG data on energetic electrons. Very-low frequency (VLF) measurements are performed by using wideband receiver for two horizontal magnetic field components and vertical electric field. We use such data from two locations, namely, Lovozero at Kola Peninsula and Kannuslehto in Finland that are located about 500 km from each other. We give examples of chorus and quasi-periodic VLF emissions for which the regions of their exit to the ground could be identified. The third part of the catalogue contains magnetic pulsations in the Pc1 frequency range that correspond to electromagnetic ion cyclotron (EMIC) waves in the magnetosphere. Their possible source regions can be identified by studying energetic ion fluxes measured by low-orbiting spacecraft, and compared with ERG and Van Allen Probe data on energetic ions and EMIC waves at high altitudes.