Neutral temperatures and emission height changes in an E-region aurora |
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| Institution: | 1. Bahir Dar University, Science College, Department of Physics Washera Geospace and Radar Science Research Laboratory, Bahir Dar, Ethiopia;2. Department of Civil and Environmental Engineering, Federal University of Paraíba, 58051-900 João Pessoa, Brazil;1. German Research Centre for Geosciences GFZ, Potsdam, Germany;2. Technische Universität Berlin, Germany;1. Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany;2. Institute of Astrophysics of Andalusia, CSIC, Granada, Spain;1. IVL Swedish Environmental Research Institute Inc., P.O. Box 53021, SE-40014 Gothenburg, Sweden;2. University of Gothenburg, Biological and Environmental Sciences, P.O. Box 463, SE-40530 Gothenburg, Sweden;3. Uppsala University, Department of Statistics, Box 513, 751 20 Uppsala, Sweden;4. University of Gothenburg, Department of Earth Sciences, P.O. Box 460, 40530 Gothenburg, Sweden;5. Swedish Meteorological and Hydrological Institute, SE-60176 Norrköping, Sweden;6. Helwan University, Botany and Microbiology Department, Faculty of Science, P.O. Box 11795, Cairo, Egypt |
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| Abstract: | In this study a method is outlined which is capable of giving neutral temperatures and height changes in the aurora when the molecular emissions originate from the E-region.Absolute spectrometric measurements of N2+ 1NG and O2+ 1NG bands and the auroral green line are performed in a nightside aurora. Rotational temperatures and band intensities are deduced by a least-squares fit of synthetic spectra to observations. There is a close correlation between the variations in rotational temperatures and the relative intensity ratio of N2+ 1NG(0,3) and O2+ 1NG(1,0) bands. The change in the relative intensity ratio is similar to the intensity variation predicted by the changing N2 and O2 densities from 120 to 150 km, obtained from the MSIS 83 model atmosphere, and the derived neutral temperature variations are consistent with a similar change in emission height of the aurora. Therefore the changing temperature is most likely due to a changing emission height of the aurora, and no local heating can be inferred. |
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