... Geoforschungszentrum Potsdam, Aussenstelle Observatorium Niemegk, Germany Magnetic and electric fields and plasma waves are generally thought to play a significant role in various processes. ... The wave instruments included hihgly sensitive sensors for measurements of fluctuations of the plasma flow, current density, electric and magnetic fields, spacecraft potential, density and temperature of the plasma and multi-channell frequency analyzers [Klimov et al., ... Magnetic field measurements . ...