Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..138..379v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 138, no. 2, April 1992, p. 379-386. Research supported by Department of Space of India.
Physics
2
Collisionless Plasmas, Magnetoplasmadynamics, Solar Activity Effects, Solar Flares, Solar Wind Velocity, Earth Orbits, Satellite Observation, Solar System
Scientific paper
Characteristics of flare-associated high-speed solar plasma streams are investigated using measurements from space probes and earth-orbiting spacecraft for the period 1964-1982. The maximum observed velocity (Vm) of these streams range from 400 to 850 km/s with peak probability for about 600 km/s. These remain for the period of 1-10 days with the peak occurrence about 3 days. The difference between the prestream velocity (V0) and Vm of any high-speed stream serves as the measure of its intensity. For about 60 percent of the flare-associated streams, (Vm-V0) is well in excess of 200 km/s and in some cases becomes as large as 450 km/s. The yearly percentage occurrence, total duration and the product of mean (Vm-V0) with total duration of the high-speed streams during the year correlates well with solar activity, e.g., maximum during high solar activity period and minimum during low solar activity. The study suggests that presence of sunspots plays a significant role in the generation of flare-associated high-speed solar streams.
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