IPS measurements and azimuthal variation of solar-wind velocity on the heliospheric current sheet

Physics

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Current Sheets, Heliosphere, Interplanetary Medium, Solar Wind Velocity, Azimuth, Scintillation, Velocity Measurement

Scientific paper

The solar-wind velocity tends to be a minimum along the heliospheric current sheet and increases with heliomagnetic latitude. In addition, an azimuthal variation of solar-wind velocity is found to exist on the current sheet. In this study of the solar-wind velocity variations on the current sheet, we have made use of interplanetary scintillation (IPS) measurements. This method provides solar-wind data over a larger range of heliolatitudes: +/- 80 deg or greater. We found that there exists a clear longitudinal variation of solar-wind velocity on the current sheet during 1973-1985. It is also noticeable that the pattern of variation changes with the phase of the solar cycle. On average, the solar-wind velocity varied from 300 to 550 km/s 1 on the current sheet during the period of study. It is also found that the longitudinal variation of the solar-wind velocity on the current sheet obtained using near-earth satellite data agrees well with that obtained using IPS data.

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