| タイトル | Impact ionization effects on Pioneer Venus Orbiter |
| 著者（英） | Brace, L. H.; Whipple, E. C.; Parker, L. W. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1983-11-01 |
| 言語 | eng |
| 内容記述 | Anomalies observed during periapsis passages of the Pioneer Venus Orbiter are discussed. Data from the Langmuir Probe Experiment show a change in the collected current at periapsis which correlates well with the neutral atmospheric density. The data can be qualitatively explained by the secondary emission of electrons from the spacecraft and from the probe caused by the impact of neutral CO2 molecules, the dominant neutral constituent at periapsis altitude of 150 km. Impact energy is 22 eV. The probe showing this effect is mounted on the leading surface of the spacecraft which is exposed to the streaming neutral gas. As the probe voltage is swept, contributions to the current from the ionospheric plasma and from the secondary electrons can be distinguished. The observed current/voltage behavior suggests a probe-barrier interaction. |
| NASA分類 | SPACECRAFT DESIGN, TESTING AND PERFORMANCE |
| レポートNO | 84N17270 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/401514 |
