spase://SMWG/Observatory/ISEE

The Explorer-class spacecraft, International Sun-Earth Explorer, that were part of the mother/daughter/heliocentric mission (ISEE 1, ISEE 2, ISEE 3). The purposes of the mission were:

        * (1) to investigate solar-terrestrial relationships at the outermost boundaries of the Earth's magnetosphere,
        * (2) to examine in detail the structure of the solar wind near the Earth and the shock wave that forms the interface between the solar wind and the Earth's magnetosphere,
        * (3) to investigate motions of and mechanisms operating in the plasma sheets, and
        * (4) to continue the investigation of cosmic rays and solar flare effects in the interplanetary region near 1 AU.

The three spacecraft carried a number of complementary instruments for making measurements of plasmas, energetic particles, waves, and fields. The mission thus extended the investigations of previous IMP spacecraft.