| タイトル | The Venus ionosphere as an obstacle to the solar wind |
| 著者（英） | Wolfe, J. A.; Theis, R. F.; Slavin, J. A.; Schatten, K. H.; Brace, L. H.; Russell, C. T. |
| 著者所属（英） | NASA Goddard Space Flight Center|NASA Ames Research Center|California Univ. |
| 発行日 | 1981-01-01 |
| 言語 | eng |
| 内容記述 | Pioneer Venus Orbiter Electron Temperature Probe measurements of hundreds of bow shock and ionopause crossings are employed in describing the configuration of these two boundaries and their variations in response to changes in solar wind pressure. The average bow shock configuration is found to be well represented by an Archimedian hyperboloid whose altitude at the subsolar point is 0.46 Venus radii, a value slightly greater than that derived from Pioneer Venus magnetometer data using a fit to a general conic section. It is noted that the average bow shock configuration exhibits a high degree of azimuthal symmetry near the terminator. The orbit to orbit variability of the shock location is unexpectedly large, the standard deviation being about 10%. A tendency is noted for the bow shock and the ionopause to expand and contract simultaneously, but the weakness of their orbit by orbit correlation suggests that the ionopause of Venus is not the only obstacle to the solar wind. It is thought that such processes as photoion pickup and charge exchange with neutrals may be important in diverting the solar wind plasma around the planet. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 81A33330 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/416788 |
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