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
Mission: Earth, Voyage to the Home Planet Radar Lab with a view of the planet. By using three separate radar echoes, scientists were able to analyze a full image of the planet. The radar technology could penetrate obstructions, including clouds and thick outgrowth of trees. Another purpose of the mission was to analyze the ecological state of the planet and to take measurements of pollution caused by carbon monoxide. The book is based upon journal entries written by Jones during the mission. He presents a typical NASA mission member's day-to-day experiences while living on the space shuttle. Jones illustrates his account with photographs from his mission and