Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..135s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, Feb. 1988, p. 135-140.
Physics
11
Annual Variations, Nightglow, Oxygen Ions, Solar Activity Effects, Solar Cycles, Tropical Regions, Radiant Flux Density, Solar Terrestrial Interactions
Scientific paper
Regular zenith measurements of the O I 630 nm 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 observations during the period 1975-1982, including theascending phase of the last solar cycle, permitted studies of solar cycle effects and seasonal variations. A large intensity increase, about seven times, from low solar activity 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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