Simultaneous investigation of magnetospheric plasma and spacecraft charging

Distortions of the measured electron and proton spectra caused by negative potential of the charged SC were registered. Typical electron spectra and plasma parameters were determined for various SC charging levels. Similar measurements in low polar orbits at the “Meteor” SC (launched in 2003 year) and the “Universitetskiy-Tatyana” SC (launched in 2005 year) were done.