Science. 1975 May 2;188(4187):474-6. doi: 10.1126/science.188.4187.474.
Two additional radio occultation measurements of the atmosphere of Jupiter were obtained with Pioneer 11. The entry measurement leads to a temperature profile that is substantially in agreement with those obtained with Pioneer 10, showing temperatures much higher than those derived from other observations. The exit measurement is not usable because of the discontinuous drift of the spacecraft auxiliary oscillator, presumably due to the trapped radiation belts of Jupiter. The combination of two Pioneer 10 measurements and one Pioneer 11 measurement yields an oblateness of 0.06496 at 1 millibar and 0.06547 at 160 millibars. Measurements in the Jovian ionosphere indicate a number of layers distributed over about 3000 kilometers, with a topside temperature of about 750 K.
“先锋 11 号”还进行了另外两次木星大气的射电掩星测量。进入测量得出的温度廓线与“先锋 10 号”的结果基本一致，显示出的温度远高于其他观测结果。由于航天器辅助振荡器的不连续漂移，退出测量无法使用，这可能是由于木星的辐射带捕获所致。结合两次“先锋 10 号”测量和一次“先锋 11 号”测量，在 1 毫巴处得到扁率为 0.06496，在 160 毫巴处得到扁率为 0.06547。在木星电离层的测量表明，存在着许多分布在约 3000 公里范围内的层，顶部温度约为 750 K。
