Thin equatorial low-speed region in the solar wind observed during the recent solar minimum

Details Thin equatorial low-speed region in the solar wind observed during the recent solar minimum Thin equatorial low-speed region in the solar wind observed during the recent solar minimum

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415359m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15359-15365.

Physics

17

Neutral Sheets, Photosphere, Solar Magnetic Field, Solar Wind Velocity, Earth Orbits, Satellite Observation, Velocity Distribution

Scientific paper

An attempt to quantify directly the latitudinal profile of the solar wind velocity around equatorial low-speed region has been made, based on observations made by Sakigake, Suisei, and IMP 8 between March 1986 and April 1987, without using the assumption that the location of the minimum velocity just coincides with that of the neutral sheet. The formula V(km/s) = A sq sin (Phi-Phi-A) + B is used to parameterize the latitudinal profile. A and B are found to be 1500-11,000 km/s and 340-400 km/s, respectively, which means that the angular width of the low-speed region below 500 km/s is about 17 deg. These values also indicate the latitudinal velocity gradient of 30 km/s/deg at the portion of velocity of 500 km/s. The latitude of the minimum velocity, Phi-A, oscillated sinusoidally around the solar equator as a function of longitude. The amplitude of the sinusoidal oscillation was 4-9 deg in 1986 and 1-2 deg in early 1987. These amplitudes are smaller than the tilt angle of the neutral line calculated from the photospheric magnetic field.

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