Reverse and Forward Slow Shocks in the Solar Wind
Reverse and forward slow shocks in solar wind from Pioneer 6 space probe
Burlaga, L. F.↗
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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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Tracking and data system support for the Pioneer project. Pioneer 8, extended mission - 1 June 1968 - 1 July 1969, volume 8
Tracking and data acquisition, scientific events and measurements, and engineering support for Pioneer 8 space probe
Renzetti, N. A.↗
Tracking and data system support for the Pioneer project, volume 7. Pioneer 7 - Extended mission, 1 July 1968 - 1 July 1969
Tables of interplanetary high energy particles, solar phenomena, and plasmas taken by Pioneer 7 space probe
Renzetti, N. A.↗
Planetary quarantine analysis for an unmanned Mars orbiter
Planetary quarantine systems analysis for biological contamination of Mariner Mars 1971 space probe
Hall, L. B.↗
Evolution of a spacecraft antenna system
Development and characteristics of mechanically despun spacecraft antenna for deep space probes, tactical communications, and community broadcast applications
Kampinsky, A.↗
Application of satellite beacon ionospheric data to solar corona Faraday rotation measurements
ATS 1 Faraday effect data applied to Pioneer 6 space probe solar corona data
Stelzried, C. T.↗
Very-low frequency electric fields in the interplanetary medium - Pioneer 8
VLF electric field data in interplanetary medium from Pioneer 8 space probe observation
Binsack, J. H.↗
Operation of a lightweight power conditioner with a hollow-cathode ion thruster
Hollow cathode ion thrustor and lightweight power conditioner of solar-electric propulsion system for unmanned deep space probes
Costogue, E. N.↗
The Pioneer 9 electric field experiment. I
Pioneer 9 space probe electric field experiment and near earth observations of noise spectra variations related to diffusive plasma layer
Crook, G. M.↗
Near sun observations of the solar wind
Solar wind turbulence spectrum from Mariner 6 and 7 space probe radar measurements, using differenced range vs integrated Doppler technique
Callahan, P. S.↗
Wide-range dynamic pressure sensor
Transducer measures pressure by sensing the damping of a vibrating diaphragm immersed in the atmosphere to be measured. Improved sensor can be included in rugged, lightweight package for use aboard aircraft, meteorological vehicles, and space probes.
Dimeff, J.↗
Study of the determination of the coefficients beta and gamma of the generalized metric of Robertson and of the dynamical oblateness of the sun
Motion of a space probe about a spherical center of attraction is considered, applying the general theory of relativity. Motion of a probe under the influence of the sun's oblateness is also discussed. Estimates of beta, gamma, and J20 using solar probe motion are presented. It is concluded that such measurements are possible if the unknown long-period perturbing acceleration is of the order of 10 to the -11th or -12th power m/sec. sq.
Marchal, C.↗
Microscopic observations of X-ray and gamma-ray induced decomposition of ammonium perchlorate crystals
The X-ray and gamma-ray induced decomposition of ammonium perchlorate was studied by optical, transmission, and scanning electron microscopy. This material is a commonly used oxidizer in solid propellents which could be employed in deep-space probes, and where they will be subjected to a variety of radiations for as long as ten years. In some respects the radiation-induced damage closely resembles the effects produced by thermal decomposition, but in other respects the results differ markedly. Similar radiation and thermal effects include the following: (1) irregular or ill-defined circular etch pits are formed in both cases; (2) approximately the same size pits are produced; (3) the pit density is similar; (4) the c face is considerably more reactive than the m face; and (5) most importantly, many of the etch pits are aligned in crystallographic directions which are the same for thermal or radiolytic decomposition. Thus, dislocations play an important role in the radiolytic decomposition process.
Herley, P. J.↗
Verification of theory on weak turbulence relating to the sequence of diffuse plasma resonances in space.
An interpretation of the sequence of diffuse plasma resonances observed by space probes (Alouette 2 and ISIS-1 satellites) is developed in terms of wave-particle nonlinear interaction in a weakly turbulent plasma including the electrostatic electron cyclotron harmonic wave instability. The longest time duration of the center frequency of the diffuse plasma resonance is found to coincide with the most favorable condition for the electrostatic electron cyclotron harmonic wave instability which is obtained by solving the dispersion equation obtained for a linear approximation of the kinetic wave equation for the warm magnetoactive plasma. The electrostatic field due to the transmission of the intense rf pulse produces plasma turbulence involving nonlinear wave-wave interaction and temperature anisotropy which leads to instability. This instability supplies energy to the turbulence. The process can be thought of as a feedback system.
Oya, H.↗
A spacecraft computer repairable via command.
The MULTIPAC is a central data system developed for deep-space probes with the distinctive feature that it may be repaired during flight via command and telemetry links by reprogramming around the failed unit. The computer organization uses pools of identical modules which the program organizes into one or more computers called processors. The interaction of these modules is dynamically controlled by the program rather than hardware. In the event of a failure, new programs are entered which reorganize the central data system with a somewhat reduced total processing capability aboard the spacecraft. Emphasis is placed on the evolution of the system architecture and the final overall system design rather than the specific logic design.
Fimmel, R. O.↗
On the writing of programming systems for spacecraft computers.
Consideration of the systems designed to generate programs for the increasingly complex digital computers being used on board unmanned deep-space probes. Such programming systems must accommodate the special-purpose features incorporated in the hardware. The use of higher-level language facilities in the programming system can significantly simplify the task. Computers for Mariner and for the Outer Planets Grand Tour are briefly described, as well as their programming systems. Aspects of the higher level languages are considered.
Mathur, F. P.↗
Low-energy proton increases associated with interplanetary shock waves.
Impulsive increases in the low energy proton flux observed by the Explorer 34 satellite, in very close time association with geomagnetic storm sudden commencements are described. It is shown that these events are of short duration (20-30 min) and occur only during the decay phase of a solar cosmic-ray flare event. The differential energy spectrum and the angular distribution of the direction of arrival of the particles are discussed. Two similar increases observed far away from the earth by the Pioneer 7 and 8 deep-space probes are also presented. These impulsive increases are compared with Energetic Storm Particle events and their similarities and differences are discussed. A model is suggested to explain these increases, based on the sweeping and trapping of low energy cosmic rays of solar origin by the advancing shock front responsible for the sudden commencement detected on the earth.
Palmeira, R. A. R.↗