Comparison of solar wind velocity measurements with a theoretical acceleration model

Details Comparison of solar wind velocity measurements with a theoretical acceleration model Comparison of solar wind velocity measurements with a theoretical acceleration model

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9613849c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 13,849-13,859. Research supported by NAF.

Physics

38

Magnetohydrodynamic Waves, Plasma Acceleration, Solar Wind Velocity, Two Fluid Models, Electron Energy, Velocity Measurement

Scientific paper

Calculations made with a two-fluid solar wind model with Alfven waves are compared to interplanetary radio-scintillation measurements of solar wind velocity. The density of the measurements permitted the observation of a single stream at more than one distance, and yielded velocities between 100 and 540 km/s. A group of 16 observed streams (of which 12 were unchanged over several days) are selected, and 8 are found to compare favorably with the model results when wave energy is added to the flow. Steep delayed acceleration is noted in four of the observed cases, and the remaining four do not accelerate much and reach their final velocity close to the base. At distances of 10-90 R(S) the model can describe only half the data, and because the model cannot be changed to adapt to the data, the possibility of observational errors is discussed. It is noted, however, that there exist significant qualitative differences in solar wind behavior at different times and locations.

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