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
Sundiver (space mission) Parker Solar Probe mission, although it would only make a single pass into the solar corona. Sundiver (space mission) Sundiver is a proposed space mission to crash a probe into the Sun, sending back data to Earth before burning up. It has been proposed as a design study by the Australian Academy of Science's National Committee for Space Science as a Flagship mission to kick-start an Australian space program. The design study is proposed as a five-year study from 2011-2015 with a complement of 10 PhDs, budgeted at a cost of $10 M (Australian), leading to a Go/NoGo Decision in