Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987scsv.rept.....s&link_type=abstract
Unknown
Physics
Annual Variations, Nightglow, Solar Activity, Solar Cycles, Anomalies, Earth Ionosphere, Electric Fields, Equatorial Regions, Southern Hemisphere
Scientific paper
Regular zenith measurements of the OI 6300Angstrom nightglow emission have been carried out at Cachoeira Paulista (22.7 deg S, 45.0 deg W; geomag. 11.9 deg S), Brazil, since 1975. The long series of the observations during the period 1975 to 1982, including the ascending phase of the last solar cycle, permitted studies of solar cycle effects and seasonal variations. A large intensity increase, about seven times, from low to high solar activity has been observed. Also, the seasonal-nocturnal intensity variations show large changes between years of low and high solar activity. The characteristics of the variations observed are closely related to the equatorial electric field variations, since the observation site is under the southern equatorial ionospheric anomaly crest.
Bittencourt J. A.
Sahai Yogeshwar
Sobral José Humberto A.
Takahashi Hiroyuki
Teixeira N. R.
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