Artificial Plasma Jets Dynamics in "North Star" Active Experiment

Physics

Scientific paper

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2149 Mhd Waves And Turbulence, 2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2423 Ionization Mechanisms

Scientific paper

Two releases of artificial plasma jets at the height of 360 and 280 km were made in "North Star" active experiment on January 22, 1999 at Poker Flat, Alaska. Electrodynamical effects and mechanisms responsible for plasma jets evolution in transverse magnetic field were investigated. Multipoint measurements of particles, electric and magnetic fields gave the possibility to gain information of jets propagation and transformation at the distances from 170 m to 1600 m from the plasma source. In the first release the plasma was injected into preliminary created air cloud. At the distance of 500 m full magnetic field expulsion was detected, and duration of diamagnetic cavity coincides with the most dense part of the jet. At the second injection without air cloud before the jet only weak decrease of the magnetic field was observed because smaller plasma density. But despite mass and kinetic energy of plasma in this injection was by the order of magnitude less than in the first injection, the jet deceleration was negligible. The role of background plasma, Alfvenic waves and field-aligned currents in plasma deceleration are discussed.

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