A search for a general gradient in the solar wind speed at low solar latitudes

Details A search for a general gradient in the solar wind speed at low solar latitudes A search for a general gradient in the solar wind speed at low solar latitudes

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..173b&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 1, 1977, p. 173-176. DOD-ERDA-NASA-sponsored research.

Physics

4

Annual Variations, Solar Corpuscular Radiation, Solar Cycles, Solar Wind Velocity, Bow Waves, Flow Velocity, Geomagnetism, Ion Concentration, Latitude, Magnetic Dipoles, Satellite Observation, Shock Waves, Velocity Distribution

Scientific paper

Long-term averages of solar-wind-speed data obtained in the ecliptic plane from July 1964 through December 1975 have been examined for a regular variation in flow speed associated with earth's yearly excursion to latitudes of plus or minus 7.25 deg about the solar equator. Regular speed modulations of about 70 km/s peaking at the highest latitudes are discernible from mid-1964 through 1966 and from early 1969 to early 1971. During the remainder of this 11.5-year interval, the modulations in speed seem to be aperiodic. A superposed epoch analysis of all the data fails to reveal a general solar latitude gradient in the solar-wind flow for these 11.5 years. It is concluded that with near-earth observations, a latitude dependence of the flow speed is too small to be detected on a regular basis against a background 'noise' of solar-wind streams, which vary in longitude, latitude, and time.

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