Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8253s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8253-8257. Research supported by FAPESP and CNPq.
Physics
22
Airglow, Plasma Bubbles, Velocity Distribution, Velocity Measurement, Zonal Flow (Meteorology), Earth Ionosphere, Electrophotometers, Equatorial Atmosphere, Optical Scanners
Scientific paper
Equatorial ionospheric plasma bubble zonal velocities were measured using two 630-nm scanning photometers. Simultaneous scanning measurements were made in two east-west planes that were tilted 30 deg northward and southward of the vertical. The results of measurements carried out during five days covering the summer equinoctial period of 1988 show evidence of marked latitudinal gradient in the bubble zonal velocities, the velocities decreasing with increasing latitude over the low-latitude observing site, Cachoeira Paulista (-28 deg dip). It is suggested that this velocity gradient is consistent with expectations at solar minimum, when the measurements may be associated with the region above the maximum in the eastward plasma velocity height profile.
Abdu Mangalathayil Ali
Sobral José Humberto A.
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