Magnetosphere of Jupiter By 1973 the magnetic moment was known within a factor of two, whereas the tilt was correctly estimated at about 10°. The modulation of Jupiter's DAM by Io (the so-called Io-DAM) was discovered in 1964, and allowed Jupiter's rotation period to be precisely determined. The definitive discovery of the Jovian magnetic field occurred in December 1973, when the Pioneer 10 spacecraft flew near the planet. As of 2009 a total of eight spacecraft have flown around Jupiter and all have contributed to the present knowledge of the Jovian magnetosphere. The first space probe to reach Jupiter was Pioneer 10 in
Moonbase Alpha (Space: 1999) Pilot Captain Alan Carter serves as section chief. In the days before the Moon's departure from Earth, Reconnaissance was responsible for all aspects of the deep-space flight missions deployed from Alpha (see the Uranus Expedition, the Astro Seven Mission to Jupiter, the Ultra Probe and the Meta Probe among others). Medical encompasses the physician and nursing staff, plus medical orderlies and laboratory technicians—twenty-five persons in all. (Scientific and support personnel can be drawn from the Research Section as needed.) The main tasks of Medical Section are: to maintain the physical and psychological health of all Alpha personnel and to carry