| タイトル | A potential control method for thermal plasma measurements on the DE-1 spacecraft |
| 著者（英） | Olsen, R. C.; Green, J. L.; Shawhan, S. D.; Chappell, C. R.; Gallagher, D. L. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 1983-11-01 |
| 言語 | eng |
| 内容記述 | Thermal plasma measurements form the Dynamics Explorer 1 spacecraft using an aperture bias in the outer plasmasphere and over the polar cap are used to show the existence of cold plasma, otherwise hidden from the particle detector by spacecraft potentials between 1 and 3 V. In eclipse, the photoelectron current drops and the spacecraft potential drops to near 0 V. At density levels between 10 and 100/cu cm, the cold plasma becomes visible in eclipse, along with a warmer tail to the distribution. Electrostatic models of the spacecraft indicate that if the spacecraft potential is more than a few volts positive, an electrostatic barrier can inhibit the effectiveness of aperture bias. Comparison of the aperture bias experiments with the electrostatic models show that the aperture bias is successful in drawing in the field-aligned flows, with kinetic energy greater than the predicted barrier height, but may not be sufficient to measure the isotropic background. |
| NASA分類 | SPACECRAFT DESIGN, TESTING AND PERFORMANCE |
| レポートNO | 84N17276 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/401513 |
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