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首页> 外文会议>7th Spacecraft Charging Technology Conference 2001: a Spacecraft Charging Odyssey, Apr 23-27, 2001, Noordwijk, the Netherlands >FIRST RESULTS OF THE SILLAGE FLIGHT EXPERIMENT ABOARD SPOT-4
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FIRST RESULTS OF THE SILLAGE FLIGHT EXPERIMENT ABOARD SPOT-4

机译：SPOT-4上空飞行实验的第一结果

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摘要

The French Earth-Observation spacecraft SPOT-4 was launched in 1998 in a low-altitude polar orbit. The orbit plane has a fixed direction with respect to the sun at the 10h30 local hour. SPOT 4 is "three-axes stabilized", which means that its orientation is fully controlled relative to three axes, with a side always in the wake. Two voltage probes were aboard SPOT-4, one on the wake wall, the second one on the opposite face, on the ram side. Each sensor is an electrostatic voltmeter monitoring the positive or negative voltage of an insulated aluminum electrode with respect to the spacecraft main frame. The first objective of this experiment was appreciating the charging hazards on LEO orbits, especially when crossing the auroral zones. Three kinds of profiles have been observed. At each output of eclipse, the ram probe becomes slightly positive as the result of a combination of the ion collection in the ram and photoemission charging when the sun illuminates the electrode. Some rare, short and low-differential-voltage charging events were observed while crossing auroral zones.
机译：法国地球观测航天器SPOT-4于1998年在低空极地轨道发射升空。在当地时间10h30，轨道平面相对于太阳具有固定的方向。 SPOT 4是“三轴稳定”的，这意味着其方向相对于三个轴完全受到控制，并且一侧始终在尾部。两个电压探头位于SPOT-4上，一个位于尾流壁上，另一个位于相对侧的撞锤侧。每个传感器都是一个静电电压表，用于监控绝缘铝电极相对于航天器主机的正电压或负电压。该实验的第一个目标是了解LEO轨道上的充电危险，尤其是穿越极光区时。已经观察到三种轮廓。在每个月食输出时，由于阳光照射电极时，冲头中的离子收集和光发射电荷的结合，使冲头探针变得略带正电。穿越极光区时，观察到一些罕见的，短时且低差分电压的充电事件。

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