Relevant aspects of equatorial plasma bubbles under different solar activity conditions |
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| Institution: | 1. Instituto Nacional de Pesquisas Espaciais, INPE, CEP12201-970, S. J. Campos, SP, Brazil;2. Universidade do Vale do Paraiba, UNIVAP, CEP12244-000, S. J. Campos, SP, Brazil;1. Instituto Nacional de Pesquisas Espaciais – INPE/MCTI, Av dos Astronautas 1758, CEP 12227-010 São José dos Campos, SP, Brazil;2. Instituto de Geofísica y Astronomía – IGA/AMA/CITMA, Calle 212 No. 2906, CP 11600 La Habana, Cuba;3. State Key Laboratory of Space Weather, National Space Science Center NSSC, Chinese Academy of Sciences (CAS), No. 1 Nanertiao, Zhongguancun, Haidian district, Postcode: 100190 Beijing, China;1. Computational Space Physics Group (GFEC), LACCTE, National Institute for Space Research (INPE), Av. dos Astronautas, 1758, C.P. 515, 12201-970 São José dos Campos, SP, Brazil;2. State Key Laboratory of Space Weather, National Space Science Center (NSSC), Chinese Academy of Sciences, NO. 1 Nanertiao, Zhongguancun, Beijing 100190, China;3. Aeronomy Division, National Institute for Space Research (INPE), Av. dos Astronautas, 1758, C.P. 515, 12201-970 São José dos Campos, SP, Brazil;1. College of Geomatics, Xi’an University of Science and Technology, Xi’an 710054, China;2. Deutsches Geodätisches Forschungsinstitut der Technischen Universität München (DGFI-TUM), Arcisstraße 21, 80333 München, Germany;1. Indian Institute of Tropical Meteorology, Pune, India;2. School of Chemistry, University of Leeds, Leeds, UK;3. National Centre for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK;4. Centre for Research in Earth and Space Science, York University, Toronto, Canada |
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| Abstract: | Observations of the OI 630 nm nightglow emission using a wide-angle imaging system have been carried out at Cachoeira Paulista (22.7° S, 45° W, 15.8° S dip latitude), Brazil during the period 1987 to 1999. The OI 630 nm images obtained during this period show frequently the optical signature of the plasma bubble (quasi north-south aligned depleted intensity regions). During the period studied a strong seasonal variation was noticed in the plasma bubble formations. Also, it was observed that, during high solar activity, the plasma bubble bifurcation occurrences were higher than during low solar activity. Important features from this set of observations are presented and discussed in this paper. |
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