Also called:
Interplanetary Monitoring Platform G
(IMP-G)
Date of launch (range):
June 21, 1969 (WTR)
Launch vehicle:
Delta E
Shape:
octagonal with 4 solar paddles
Weight (kg):
78.7
Dimensions (m):
0.71, diameter
0.25, height
Power source:
solar arrays plus AgCd battery
Prime contractor:
in-house
Date of reentry:
Dec. 23, 1972
Responsible NASA center:
GSFC
Project manager:
Paul Butler
Project Scientist:
Frank B. McDonald
Objectives:
To obtain measurements from the
plasma and energetic particle experiments to allow
continuation and extension of studies of the environment
within and beyond earth's magnetosphere (7th in
series).
Experiments (responsible
organization):
.
Low-energy telescope (Bell Telephone
Laboratories, Inc.)
Ion chamber (Univ. of California,
Berkeley)
Low-energy solar flare electron
detector (Univ. of CA, Berkeley)
Composition of cosmic rays (Univ. of
Chicago)
Low-energy proton and electron
differential energy analyzer (Univ. of Iowa)
Low-energy proton differential energy
analyzer (Univ. of IA)
Cosmic ray anisotropy (Southwest
Center for Advanced Studies)
Solar proton detector (GSFC and
Applied Physics Laboratory, Johns Hopkins)
Plasma composition and ion energy
distribution (GSFC and Univ. of Maryland)
Low-energy proton and alpha detector
(GSFC)
Energy vs energy loss (GSFC)
Magnetic fields (GSFC)
Results:
Successful; also used in July-Aug.
1972 to observe solar flare activity.
Reference: MOR S-861-69-07, June 13, 1969; and NASA Hq. Release 69-89, "IMP-G," June 15, 1969.