Beskrivning : Numbered cover with silk cachet, Cape Canaveral post stamp.
The Explorer-class mother spacecraft, ISEE 1 (International Sun-Earth Explorer 1), was part of the mother / daughter / heliocentric mission (ISEE 1, ISEE 2, ISEE 3). The purposes of the mission were:

- To investigate solar-terrestrial relationships at the outermost boundaries of the Earth`s magnetosphere,
-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,
-To investigate motions of and mechanisms operating in the plasma sheets, and
-To continue the investigation of cosmic rays and solar flare effects in the interplanetary region near 1 AU.

K 115 - image retouchée ?

Sida : kourou 211   · Ref: K  115 

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Rymdhändelse :

ISEE 1 (EXPLORER 56) & ISEE 2 (SATELLITES) · DELTA 2914