An Apparent Lifetime of Auroral 630.0nm (OI) Emissions
An apparent lifetime of the auroral red line (630.0nm OI) emission was investigated by using monochromatic auroral TV images obtained on July 18, 1984, at Syowa Station, Antarctica. We tried to evaluate a mean energy of the incoming electrons by using the temporal variation of the red line intensity...
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| Published in | Journal of geomagnetism and geoelectricity Vol. 44; no. 2; pp. 91 - 108 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
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Society of Geomagnetism and Earth, Planetary and Space Sciences
1992
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| Abstract | An apparent lifetime of the auroral red line (630.0nm OI) emission was investigated by using monochromatic auroral TV images obtained on July 18, 1984, at Syowa Station, Antarctica. We tried to evaluate a mean energy of the incoming electrons by using the temporal variation of the red line intensity. The observed red line intensity is compared with a synthesized variation of the auroral red line solving differential equations for chemical reactions in the auroral ionosphere as well as the deactivation of excited state oxygen atoms. The observational results showed that the red line intensity changed gradually keeping an apparent lifetime of about 35-40sec while the green line intensity changed step-wise. The lifetime found is significantly smaller than a value (about 110sec) previously used for the interpretation of 630.0nm (OI) auroral emission. The comparison showed that the observed apparent lifetime is consistent with a synthesized aurora excited by a low energy electrons with a characteristic energy of 0.2-0.5keV. |
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| AbstractList | An apparent lifetime of the auroral red line (630.0nm OI) emission was investigated by using monochromatic auroral TV images obtained on July 18, 1984, at Syowa Station, Antarctica. We tried to evaluate a mean energy of the incoming electrons by using the temporal variation of the red line intensity. The observed red line intensity is compared with a synthesized variation of the auroral red line solving differential equations for chemical reactions in the auroral ionosphere as well as the deactivation of excited state oxygen atoms. The observational results showed that the red line intensity changed gradually keeping an apparent lifetime of about 35-40sec while the green line intensity changed step-wise. The lifetime found is significantly smaller than a value (about 110sec) previously used for the interpretation of 630.0nm (OI) auroral emission. The comparison showed that the observed apparent lifetime is consistent with a synthesized aurora excited by a low energy electrons with a characteristic energy of 0.2-0.5keV. |
| Author | ONO, Takayuki HIRASAWA, Takeo |
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| References | SHIOKAWA, K., Magnetosphere-ionosphere coupling processes observed by the antarctic rockets and DMSP satellites, Master Thesis, Tohoku Univ., 1990. ONO, T., T. HIRASAWA, and C.-I. MENG, Weak auroral emissions and particle precipitations in the dusk auroral oval, J. Geophys. Res., 94, 11933-11947, 1989. REES, M. H., B. A. EMERY, and K. STAMNES, Neutral and ion gas heating by auroral electron precipitation, J. Geophys. Res., 88, 6289-6300, 1983. REES, M. H. and R. G. ROBLE, Excitation of O(1D) atoms in aurorae and emissions of (OI) 6300Å line, Can. J. Phys., 64, 1608-1613, 1986. BANKS, P. M., C. R. CHAPPELL, and A. F. NAGY, A new model for the interaction of auroral electrons with the atmosphere: Spectral duration, backscatter, optical emission, and ionization, J. Geophys. Res., 79, 1459-1470, 1974. REES, M. H., Physics and Chemistry of the Upper Atmosphere, Cambridge Atmospheric and Space Science Series, Cambridge Univ. Press, 1989. STAMNES, K., On the two-stream approach to electron transport and thermalization, J. Geophys. Res., 86, 2405-2410, 1981. BURNS, G. B. and J. S. REID, A comparison of methods for calculating O(1S) lifetimes, Aust. J. Phys., 38, 647-656, 1985. HEDIN, A. E., MSIS-86 thermospheric model, J. Geophys. Res., 92, 4649-4662, 1987. STRICKLAND, D. J., D. L. BOOK, T. P. COFFEY, and J. A. FEDDER, Transport equation techniques for the deposition of auroral electrons, J. Geophys. Res., 81, 2755-2764, 1976. LINK, R. and L. L. COGGER, A reexamination of the OI 6300-Å nightglow, J. Geophys. Res., 93, 9883-9892, 1988. STRICKLAND, D. J., R. R. MEIER, J. H. HECHT, and A. B. CHRISTENSEN, Deducing composition and incident electron spectra from ground-based auroral optical measurements: Theory and model results, J. Geophys. Res., 94, 13527-13539, 1989. GATTINGER, R. L., F. R. Harris, and A. VALLANCE JONES, The height, spectrum and mechanism of type-B red aurora and its bearing on the excitation of O(1S) in aurora, Space Sci. Rev., 33, 207-221, 1985. REES, M. H., Excitation of high altitude red auroral arc, Planet. Space Sci., 8, 59-67, 1961. SOLOMON, S. C., P. B. HAYS, and V. J. ABREU, The auroral 6300Å emission: Observation and modeling, J. Geophys. Res., 93, 9867-9882, 1988. VALLANCE JONES, A., Aurora, Geophysics and Astrophysics Monographs, Vol. 9, D. Reidel Publishing Company, Mass., 1974. REES, M. H. and D. LUCKEY, Auroral electron energy derived from ratio of spectroscopic emissions, J. Geophys. Res., 79, 5181-5186, 1974. DAVIDSON, G. T. and R. D. SEARS, Pulsating aurorae: Evidence for flux limiting, Geophys. Res. Lett., 7, 185-188, 1980. STAMNES, K. and M. H. REES, Inelastic scattering effects on photoelectron spectra and ionospheric electron temperature, J. Geophys. Res., 88, 6301-6309, 1983. EVANS, W. F. J. and A. VALLANCE JONES, Some observations of type-B red aurora with a multichannel photometers, Can. J. Phys., 43, 697-704, 1965. VALLANCE JONES, A., Auroral spectroscopy, Space Sci. Rev., 11, 776-826, 1971. EATHER, R. H., Short-period auroral pulsations in 6300 OI, J. Geophys. Res., 74, 4998-5004, 1969. ONO, T., M. EJIRI, and T. HIRASAWA, Monochromatic auroral images observed at Syowa Station, in Antarctica, J. Geomag. Geoelectr., 39, 65-95, 1987a. ONO, T., T. HIRASAWA, and C.-I. MENG, Proton auroras observed at the equatorward edge of the duskside auroral oval, Geophys. Res. Lett., 14, 660-663, 1987b. SRIVASTAVA, V. and V. SINGH, Model calculations of O(1S) and O(1D) emissions under proton bombardment, J. Geophys. Res., 93, 5855-5869, 1988. CARTWRIGHT, D. C., Vibrational populations of the excited states of N2 under auroral conditions, J. Geophys. Res., 83, 517-531, 1978. HAYS, P. B. and S. K. ATREA, The influence of thermospheric winds on the auroral red-line profile of atomic oxygen, Planet. Space Sci., 19, 1225-1228, 1971. VALLANCE JONES, A., R. L. GATTINGER, P. SMITH, J. W. MERIWETHER, V. B. WICKWAR, and J. KELLY, Optical and radar characterization of a short-lived auroral event at high latitude, J. Geophys. Res., 92, 4575-4589, 1987. |
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