Further analysis of non-linear density fluctuations in the foot of quasi-perpendicular shock

Details Further analysis of non-linear density fluctuations in the foot of quasi-perpendicular shock Further analysis of non-linear density fluctuations in the foot of quasi-perpendicular shock

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..297s&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 8-9, p. 297-310

Computer Science

Sound

Density Distribution, Earth Magnetosphere, Ion Distribution, Ion Scattering, Nonlinear Equations, Shock Fronts, Shock Wave Profiles, Shock Waves, Data Reduction, Electric Fields, Plasma Turbulence, Prognoz Satellites, Spectrograms, Variations, Velocity Distribution

Scientific paper

Dissipation processes and shock structrure in the strong quasi-perpendicular case are mainly controlled by reflection of part of the ions from the shock front. The reflected beam excites strong electric field and number density fluctuations within the foot. However no significant heating of ions is observed until the transition to downstream state occurs on a very short scale within magnetic ramp. These processes are analyzed with the measurements of ion flux and electric field turbulence measured on Prognoz 8 and Prognoz 10 - Intershock satellites. Satured lower-hybrid-range turbulence in the foot leads to the development of very strong (delta N/N approximately 1) number density fluctuations. These structures are accompanied by electric field fluctuations of approximately 10 mV/m and by ion-sound bursts. The measured electric potential profile in the non-linear structure is very close to the number density variation profile suggesting an electrostatic nature of turbulence. A comparison of the electric field variation with the ion flow vector velocity allows one to estimate the magnitude of the electric potential variation across this structure and its linear scale.

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