Three-station observations of interplanetary scintillation at 327 MHz-II - Evolution of two-dimensional solar wind speed structure during 1983 to 1985

Astronomy and Astrophysics – Astronomy

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Computer Aided Mapping, Interplanetary Medium, Radio Astronomy, Scintillation, Solar Wind Velocity, Color Coding, Interplanetary Magnetic Fields, Neutral Sheets, Solar Activity Effects, Solar Rotation

Scientific paper

Regular three-site observations of 327-MHz interplanetary scintillation obtained using the stations and apparatus described by Kojima et al. (1982) during 1983-1985 are reported and analyzed in terms of the two-dimensional structure of the solar wind. The data are presented in a series of color maps and characterized in detail. Features observed include concentration of low-speed regions around a wavy neutral sheet formed by the magnetic dipole and quadrupole fields, fuller development of high-speed regions in the Northern Hemisphere, large latitudional speed gradients, and two minimum-speed regions separated longitudinally by 180 deg and coincident with two giant bipolar magnetic regions.

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