Observations of structuring in the downstream region of a large spherical model in a laboratory simulated solar wind plasma

Details Observations of structuring in the downstream region of a large spherical model in a laboratory simulated solar wind plasma Observations of structuring in the downstream region of a large spherical model in a laboratory simulated solar wind plasma

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.6053i&link_type=abstract

Journal of Geophysical Research, vol. 87, Aug. 1, 1982, p. 6053-6059.

Astronomy and Astrophysics

Astrophysics

7

High Energy Interactions, Hydrogen Plasma, Plasma Currents, Plasma Interactions, Solar Wind, Spherical Plasmas, Debye Length, Electrostatic Probes, Magnetohydrodynamic Turbulence, Plasma Flux Measurement, Solar Wind Velocity, Space Plasmas, Stellar Winds

Scientific paper

The effects of inserting a spherical conducting model, large in comparison with the Debye length, into a free streaming high-energy 1 kV) unmagnetized hydrogen plasma are investigated in order to measure energies and compositions directly relevant to solar wind and astrophysical plasma phenomena. Holding the incident plasma parameters constant, transverse profiles of the net Langmuir probe current are plotted at various locations downstream in the model wake and are divided into three regions (the shadow, transition, and boundary). Results attributable to the use of a high-energy plasma show that enhancements in the shadow exist at downstream locations where the Mach ratio is less than one, and turbulence exists in the transition region on the shadow edges and outside in the boundary region. In addition, a small current enhancement is found in the boundary and can be attributed to the plasma/model interaction. It is concluded that many similar features observed by spacecraft downstream from planetary bodies are relatively permanent and are due to the intrinsic nature of the interaction between the solar wind plasma and the obstacle.

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