Explorer 6 was a small, spheroidal satellite designed to study trapped
radiation of various energies, galactic cosmic rays, geomagnetism,
radio propagation in the upper atmosphere, and the flux of
micrometeorites. It also tested a scanning device designed for
photographing the earth's cloud cover. The satellite was launched
into a highly elliptical orbit with an initial local time of apogee of
2100 h. The satellite was spin stabilized at 2.8 rps, with the
direction of the spin axis having a right ascension of 217 deg and a
declination of 23 deg. Four solar cell paddles mounted near its
equator recharged the storage batteries while in orbit. Each
experiment except the television scanner had two outputs, digital and
analog. A UHF transmitter was used for the digital telemetry and the
TV signal. Two VHF transmitters were used to transmit the analog
signal. The VHF transmitters were operated continuously. The UHF
transmitter was operated for only a few hours each day. Only three of
the solar cell paddles fully erected, and this occurred during spin up
rather than prior to spin up as planned. Consequently, initial
operation of the payload power supply was 63% nominal, and this
decreased with time. The decreased power caused a lower
signal-to-noise ratio affecting most of the data, especially near
apogee. One VHF transmitter failed on September 11, 1959, and the
last contact with the payload was made on October 6, 1959, at which
time the solar cell charging current had fallen below that required to
maintain the satellite equipment. A total of 827 h of analog and 23 h
of digital data was obtained.