Orbit Inclination: 18.2
Period: 591.9 min
Perigee: 335 km
Apogee: 33612 km
Orbit Type: HEO > Highly Elliptical Orbit

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The Combined Release and Radiation Effects Satellite (CRRES) Program
is comprised of several elements. One is the release of powdered and
liquid chemicals during the first 45 to 60 days after ... launch, when the
spacecraft is in its 300-km altitude circular orbit. These releases
are used to study electric fields, neutral winds, and other phenomena
in the upper atmosphere, the ionosphere, and the magnetosphere. The
spacecraft spins at 20 rpm during the low altitude orbit phase of the
program. After the chemical releases are completed, the satellite is
boosted into a geosynchronous-transfer-type orbit and spun down to 2
rpm. The orbit parameters of this final orbit are as follows: apogee
altitude - 35,800 km, perigee altitude - 400 km, period - 630 min,
inclination - about 16 deg.
As the satellite traverses the inner magnetosphere, a full
complement of field, particle, and plasma instruments measures
the radiation environment. A comprehensive set of state-of-the-art
microelectronics devices and other spacecraft components are tested
in orbit for radiation effects. A major segment of the CRRES payload
is part of AFGL's Space Radiation Effects Program (SPACERAD). The
SPACERAD Program is a comprehensive space and ground test effort to
(a) measure radiation-induced single event upsets and total dose
degradation of state-of-the-art microelectronics devices, including
VHSIC and GaAs, in a known space environment; (b) perform laboratory
radiation response and annealing characterization of parts identical
to those flown on CRRES; (c) develop algorithms to relate space
performance of microelectronic components to ground test
procedures, and update existing radiation ground test guidelines to
more accurately simulate the behavior of devices in space; (d) space
qualify advanced technology devices for use in operational systems;
(e) update the static models of the radiation belts; and (f) develop
the first dynamic models of the high-energy particle populations. The
on-orbit phase of SPACERAD lasts for about 3 years. In addition,
there are other radiation belt experiments on CRRES provided by the
Navy. The CRRES spacecraft has the shape of an octagonal prism with
solar arrays on the top side. The prism is 1 m high and 3 m between
opposite faces. Four of the eight compartments are for the chemical
canisters and the other four house the SPACERAD and other experiments.
The spin axis of CRRES is controlled so that it points at the sun.
Spacecraft Orbit Information
Launch Date and Time 07/25/90
Orbit Type Elliptical
Anomalistic Period 591.9 Min
Apogee(km) 33612.
Perigee(km) 335.
Inclination 18.2

http://www.spenvis.oma.be/spenvis/help/models/databases/crres.html
http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1990-065A