A new trajectory concept for exploring the earth's geomagnetic tail

Astronomy and Astrophysics – Astronomy

Scientific paper

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Earth Orbits, Geomagnetic Tail, Planetary Mapping, Swingby Technique, Trajectory Analysis, Geomorphology, Lunar Gravitation, Solar Terrestrial Interactions, Trajectory Control

Scientific paper

An innovative trajectory technique for a magnetotail mapping mission is described which can control the apsidal rotation of an elliptical earth orbit and keep its apogee segment inside the tail region. The required apsidal rotation rate of approximately 1 deg/day is achieved by using the moon to carry out a prescribed sequence of gravity-assist maneuvers. Apogee distances are alternately raised and lowered by the lunar-swingby maneuvers; several categories of the 'sun-synchronous' swingby trajectories are identified. The strength and flexibility of the new trajectory concept is demonstrated by using real-world simulations showing that a large variety of trajectory shapes can be used to explore the earth's geomagnetic tail between 60 and 250 R sub E.

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