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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 6
Ann. Geophys., 15, 797–804, 1997
https://doi.org/10.1007/s00585-997-0797-4
© European Geosciences Union 1997
Ann. Geophys., 15, 797–804, 1997
https://doi.org/10.1007/s00585-997-0797-4
© European Geosciences Union 1997

  30 Jun 1997

30 Jun 1997

Mesospheric energy loss rates by OH and O2 emissions at 23°S

P. R. Fagundes*, D. Gobbi, H. Takahashi, and Y. Sahai P. R. Fagundes et al.
  • Instituto Nacional de Pesquisas Espaciais-INPE-C.P. 515-12.201-970-São José des Campos, SP, Brazil; e-mail: fagundes@fislume.laser.impe.br
  • *Also at: Universidade do Vale do Paraíbs-UNIVAP-IP&D, Urbanova, S. José des Campos, SP, Brazil

Abstract. The nightglow OH(9, 4) and O2 atmospheric (0,1) band emission intensities and their rotational temperatures T(OH) and T(O2), respectively, observed at Cachoeira Paulista (23°S, 45°W), Brazil, during the period from October 1989 to December 1990, have been analyzed to study the nighttime mesospheric energy loss rates through the radiations from the vibrationally excited OH* and electronically excited O2* bands. The total emission rates of the OH Meinel bands, O2 atmospheric (0,0) and O2 infrared atmospheric (1Δg) bands were calculated using reported data for the relative band intensities I''')/I(9,4), IO2A(0,0)/IO2A(0,1) and IO2(1Δg)/IO2A(0,1). It was found that there is a minimum in equivalent energy loss rate by the OH* Meinel bands during December/January (equivalent energy loss rate of 0.39K/day*, where day* means averaged over the night) and maximum in equivalent energy loss rate during September (equivalent energy loss rate of 0.98K/day*). Energy loss rate by the O2* radiation, on the other hand, is weaker than that by the OH* Meinel bands, showing equivalent energy loss rates of 0.12K/day* and 0.22K/day* during January and September, respectively.

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