Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..109k&link_type=abstract
Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 109
Physics
1
Particle Emission, Solar Wind, Particle Measurements
Scientific paper
Velocity interplanetary scintillation (IPS) observations have been obtained at a frequency of 327 MHz by the Solar-Terrestrial Environment Laboratory since the early 1980s, covering the distance range from 0.1 to 1 AU. The IPS technique measures high-latitude streams which have low speeds (<=400 km/s) within 0.3 AU and high speeds (>=700 km/s) beyond 0.3 AU. The foot points of these streams were located in the HeI coronal holes or at their boundaries. Since the IPS measurement can be biased by line-of-sight integration, we investigated whether the acceleration observation could be a result of the biasing effect. We found that if the velocity dependence of turbulence level is expressed by δNe=V-α, α should be equal to 0.5 at distances beyond 0.3 AU. If α increases to 2.2 within 0.3 AU, the IPS speed in high latitude stream near the sun can be biased lower by about 200 km/s. However, a much larger α near the sun is required to explain a speed difference of 300 km/s.
Kojima Masamichi
Misawa Hiroaki
Watanabe Hiroko
Yamauchi Yoshiaki
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