Modulation of the background flux of energetic particles by artificial injection

Abstract A rocket experiment of plasma injection in the Brazilian magnetic anomaly region was performed according to the scientific programme COMBI. Experiment scenario, diagnostic instrumentation on board, plasma generator were the same as in other COMBI programme experiments. Multichannel registration of energetic particle flux was made by Geiger counters. At height range (165–200 km) a deep modulation (100%) of natural energetic particle flux by plasma injection was registered. Modulation period of particle flux was equal to plasma injection period 5s. During injection particle flux decreased by more than one order and restored its previous value during the pause. We present the detailed decription of the experiment, method data treatment and analysis and physical processes which may be responsible for the observed phenomenon.