| タイトル | An experimental investigation of thermospheric structure near an auroral arc |
| 著者（英） | Hoegy, W. R.; Wharton, L. E.; Wu, Q.; Eastes, R. W.; Killeen, T. L.; Carignan, G. R.; Winningham, J. D. |
| 著者所属（英） | NASA Headquarters; NASA Goddard Space Flight Center |
| 発行日 | 1992-07-01 |
| 言語 | eng |
| 内容記述 | The paper compares observations of thermospheric parameters, made from DE-2 spacecraft during three successive orbital crossings of a quiescent dusk sector auroral arc, with the predictions of three fine-grid auroral arc models. DE-2 measured the ion and neutral window, electron and neutral temperatures, neutral composition, and energetic auroral electron spectra (5 eV to 32 keV) at about 320 km altitude. The DE-2 composition measurements showed a local increase of the N2/O ratio in the arc, which is interpreted to be a result of the upward motion of N2-rich air. A reduction in the measured neutral temperature of about 100 K in the arc, relative to temperatures on either side, was found for all three arc crossings. Of the three theoretical models examined, only one shows a tendency for the neutral thermospheric temperature to drop in the auroral arc, and the decrease is significantly less than the observed temperature change. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 92A47458 |
| 権利 | Copyright |
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