Fine structure of the ionospheric plasma bubbles observed by the OI 6300 and 5577 airglow images |
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| Institution: | 1. Universidade Federal de Santa Maria (UFSM), Departamento de Engenharia Florestal, linha Sete de Setembro s/n, CESNORS/UFSM, 98400-000 Frederico Westphalen, RS, Brazil;2. Divisão de Sensoriamento Remoto, Instituto Nacional de Pesquisas Espaciais (DSR-INPE), Caixa Postal 515, Av. dos Astronautas, 1758, Bairro Jardim da Granja, 12245-970 São José dos Campos, SP, Brazil;3. Universidade do Estado do Amazonas (UEA), Escola Normal Superior, Avenida Djalma Batista – 2470, Bairro Chapada, 69050-010 Manaus, AM, Brazil;4. Centro Regional Sul de Pesquisas Espaciais, Instituto Nacional de Pesquisas Espaciais (CRS-INPE), Av. Roraima S/N, CEP:97105-970, Campus UFSM, Santa Maria, RS, Brazil;1. Meteorological Service of Catalonia (SMC), Barcelona, Spain;2. Barcelona Supercomputing Center — Centro Nacional de Supercomputación (BSC — CNS), Barcelona, Spain |
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| Abstract: | Simultaneous measurements of the ionospheric airglow OI 630.0 nm and OI 557.7 nm emissions have been carried out by means of an all-sky CCD imager system at Cachoeira Paulista, since October 1998. During a developed phase of plasma depletion (bubble) in the equatorial anomaly region, both emissions show intensity depletions along the geomagnetic North—South direction, and also bifurcation of the bubbles. It is frequently observed that the OI 557.7 image shows more fine structure of the bubble than the OI 630.0. The amplitude of the intensity depletion was also larger for OI557.7 than OI630.0. This might be due to the difference in life time between the O(1D) and O(1S) states, which are responsible for the OI 630.0 and OI 557.7 emissions, respectively. The O(1D) might be affected by thermal relaxation and diffusion processes before the radiative transition. |
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