Solar cycle and seasonal variations of the low latitude OI 630 nm nightglow |
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| Institution: | 1. Department of Nutrition and Dietetics, School of Health Science and Education, Harokopio University, Athens, Greece;2. Parc Sanitari Sant Joan de Déu, Fundació Sant Joan de Déu, CIBERSAM, Universitat de Barcelona, Barcelona, Spain;3. Health Center of Areopolis, General Hospital of Sparta, Aeropolis, Greece;4. University of Malta, Nutrition, Family and Consumer Studies Office, Msida, Malta;5. Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy;6. Clinic of Social and Family Medicine, School of Medicine, University of Crete, Heraklion, Greece;7. Health Center of Kalloni, General Hospital of Mitilini, Mitilini, Greece;8. Research Group on Community Nutrition and Oxidative Stress, Universitat de les Illes Balears & CIBERobn, Guillem Colom Bldg, Campus, E-07122 Palma de Mallorca, Spain;9. Department of Kinesiology and Health, School of Arts and Sciences, Rutgers University, NJ, USA |
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| Abstract: | Regular zenith measurements of the OI 630 nm nightglow emission have been carried out at Cachoeira Paulista (22.7°S, 45.0°W; geomag. 11.9°S), Brazil, since 1975. The long series of observations during the period 1975–1982, 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 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. |
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