FUTURE solar physics missions will require the ability to reposition multiple spacecraft at different azimuthal positions relative to the Earth, while remaining close to a one year circular orbit. Such azimuthal repositioningwill allow stereoscopicviews of solar features to be generated and will allow imaging of coronal mass ejections as they transit the sun-Earth line. The NASA STEREO mission, which is scheduled for launch in 2005, will utilize two spacecraft to perform such tasks. Both spacecraft will be launched on a Delta II 7925 and will use multiple lunar gravity assists to maneuver the spacecraft onto leading and trailing heliocentric orbits. The two spacecraft will then drift ahead of and behind the Earth on free-drift trajectories,with increasingEarth-sun-spacecraft angles.
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机译：未来的太阳物理任务将需要能够将多艘航天器重新定位在相对于地球的不同方位角位置，同时保持接近一年的圆形轨道。这种方位角的重新定位将允许生成太阳特征的立体视图，并允许在日冕质量抛射穿过太阳地球线时成像。预定于2005年发射的NASA STEREO任务将利用两艘航天器执行此类任务。这两架航天器都将在Delta II 7925上发射，并将使用多个月球重力辅助装置将航天器操纵到前，后日心轴轨道上。然后，这两个航天器将以自由漂移的轨迹在地球前后移动，随着地球-太阳-航天器角度的增加。
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