A survey around a recently-fueled MMRTG in the terrestrial atmosphere finds a warm air plume with a characteristic updraft velocity of ∼1 m/s and a temperature rise of ∼4 K. Additionally, a roughly hundredfold enhancement in ion density to ∼70,000/cm3 in the vicinity (<∼1 m) of the generator was observed: air electrical conductivity was measured to be ∼10−13 S/m. No evidence of ozone production was detected. These observations inform the electrical charging environment and possible local perturbation to meteorological measurements on Mars or Titan on MMRTG-powered landers or rovers. On Mars, the effects of any electrical conductivity enhancement are likely small, but on Titan they may be significant.

中文翻译：

---

多任务放射性同位素热电发电机（MMRTG）对局地大气环境的影响

对最近在陆地大气中加注燃料的 MMRTG 进行的一项调查发现，一个暖空气羽流具有约 1 m/s 的特征上升气流速度和约 4 K 的温升。此外，离子密度大约增加了 100 倍至约 70,000/观察到发电机附近（<~1 m）的 cm3：空气电导率测量为~10-13 S/m。没有检测到臭氧产生的证据。这些观察结果为充电环境和可能的局部扰动提供了对火星或泰坦上 MMRTG 动力着陆器或漫游车的气象测量的信息。在火星上，任何导电性增强的影响可能很小，但在泰坦上它们可能很重要。