| タイトル | First measurements of supersonic polar wind in the polar magnetosphere |
| 著者（英） | Chappell, C. R.; Comfort, R. H.; Olsen, R. C.; Waite, J. H., Jr.; Green, J. L.; Nagai, T. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 1984-07-01 |
| 言語 | eng |
| 内容記述 | Measurements from the Retarding Ion Mass Spectrometer on the Dynamics Explorer have, for the first time, revealed a supersonic polar wind along polar cap field lines. The observations reported were obtained on the nightside (22:30 to 23:30 MLT) from 65 to 81 deg invariant latitude and at altitudes near 2 earth radii. Fitting the data using a thin-sheath model gives a range of temperatures of 0.1 to 0.2 eV with corresponding flow velocities of 25 to 16 km/s over the estimated range of spacecraft potential of +3 to +5 V. For these values the Mach number ranged from 5.1 to 2.6 (with a most likely value of 3). Characteristics of the H(+) flow are in general agreement with those predicted by 'classical' polar wind theory, but high variabilty of the He(+)/H(+) ratio was observed. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 92A55136 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/324282 |
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