Explorer 34

Explorer 34
	Explorer 34 satellite
Names	IMP-F; IMP-4; Interplanetary Monitoring Platform-4
Mission type	Space physics
Operator	NASA
COSPAR ID	1967-051A
SATCAT no.	02817
Mission duration	2 years (achieved)
Spacecraft properties
Spacecraft	Explorer XXXIV
Spacecraft type	Interplanetary Monitoring Platform
Bus	IMP
Manufacturer	Goddard Space Flight Center
Launch mass	163 kg (359 lb)
Dimensions	71 × 20.3 cm (28.0 × 8.0 in)
Power	4 deployable solar arrays and batteries
Start of mission
Launch date	24 May 1967, 14:05:54 GMT
Rocket	Delta E1 (Thor 486 / Delta 049)
Launch site	Vandenberg, SLC-2E
Entered service	24 May 1967
End of mission
Last contact	3 May 1969
Decay date	3 May 1969
Orbital parameters
Reference system	Geocentric orbit
Regime	Highly elliptical orbit
Perigee altitude	2,031 km (1,262 mi)
Apogee altitude	209,242 km (130,017 mi)
Inclination	68.50°
Period	6218.30 minutes
Instruments
Instruments
	Cosmic-Ray Anisotropy
	Cosmic-Ray Energy versus Energy Loss
	Cosmic-Ray Proton (R versus DE/DX)
	Electrostatic Analyzer
	Ion Chamber
	Low-Energy Proton and Alpha Detector
	Low-Energy Proton and Electron Differential Energy Analyzer (LEPEDEA)
	Low-Energy Solid-State Telescope
	Solar Proton Monitoring Experiment
	Spherical Electrostatic Analyzer
	Triaxial Fluxgate Magnetometer
	Explorers program Interplanetary Monitoring Platform

Explorer 34 (IMP-F, IMP-4), was a NASA satellite launched as part of Explorer program. Explorer 34 as launched on 24 May 1967 from Vandenberg Air Force Base, California, with Thor-Delta E1 launch vehicle. Explorer 34 was the fifth satellite launched as part of the Interplanetary Monitoring Platform program, but was known as "IMP-4" because the preceding launch was more specifically part of the "Anchored IMP" sub-program. The spacecraft was put into space between the launches of Explorer 33 (IMP-D / AIMP-1) in 1966 and Explorer 35 (IMP-E / AIMP-2) in July 1967, but the next satellite to use Explorer 34's general design was Explorer 41 (IMP-G / IMP-5), which flew in 1969.