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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Reports are presented concerning the flight of Aerobee 170, 13.063 UG. The papers presented include: soft X-rays for Cygnus X-1 and Cygnus X-2; X-ray spectrum of the entire Cygnus loop; X-ray surface brightness of the Cygnus loop; and observations of He II 304 A and He I 584 a nightglow.
Upper atmospheric nitric oxide determined from Aerobee measurement of UV dayglow spectra
The liquid rocket static test range of the Iowa State University incorporates an Aerobee sustainer propulsion system consisting of a pressure fed (helium) liquid bipropellant (hypergolic) rocket engine with a regeneratively fuel-cooled thrust chamber assembly. The paper covers test results to date (including results of four test firings in the water expulsion mode), construction details of the test stand, the laboratory course syllabus, and the environmental impact statement.
The X-ray spectroscopy experiment to be flown on Aerobee Flight 13.009 is described. A brief description of the detector system is given along with a description of the electronic equipment.
Analysis of preflight equipment failures of Agena rocket
Analysis of coronal streamers photographed by white light coronagraphs flown on Aerobee 150 vehicle
The X-ray optical detection system flown on Aerobee 17.08 is described in detail, and the preliminary results of the 24 June 1971 flight are discussed. The optical design, fabrication and parabolic nature of the mirrors, effective aperture of mirror array, and X-ray detectors are considered. Preliminary analysis of data from the flight confirms the extended nature and complex structure of the X-ray source in Virgo. A core of X-ray emission is indicated which is approximately 0.5 deg in diameter and surrounded by an emitting region at least 2 deg across. The Virgo source spectrum is observed to have few low energy photons.
Absorption at solar H Lyman alpha line by earth hydrogen atmosphere measured as function of altitude from Aerobee flight spectrograms
The research in the program for designing and fabricating payloads for sounding rockets for use in X-ray astronomy is reported. Published papers concerning six Aerobee flights are presented. The results include: (1) the establishment of the radio galaxy M87 as an X-ray source; (2) the studies of the pulsar NPO532, including its X-ray pulse shape, the determination of the synchronism of the optical and X-ray pulses and the codiscovery of its existence as an X-ray pulsar; (3) the determination of many X-ray source positions, and (4) the precise position of Cyg X-1 which led directly to the identification of a ninth magnitude BO supergiant.
The design and fabrication of scientific payloads are described, and results of astrophysical research are reported. Summaries of three Aerobee flights are included.
Doors that allow scientific instruments to record and retrieve the observed data are often required to be designed and installed as a part of sounding rocket hardware. The motor-actuated vacuum door was designed to maintain a medium vacuum of the order of 0.0001 torr or better while closed, and to provide an opening 15 inches long x 8.5 inches wide while open for cameras to image Halley's comet. When the electric motor receives the instruction to open the door through the payload battery, timer, and relay circuit, the first operation is to unlock the door. After unlatching, the torque transmitted by the motor to the main shaft through the links opens the door. A microswitch actuator, which rides on the linear motion conversion mechanism, is adjusted to trip the limit switch at the end of the travel. The process is repeated in the reverse order to close the door. 'O' rings are designed to maintain the seal. Door mechanisms similar to the one described have flown on Aerobee 17.018 and Black Brant 27.047 payloads.