Densities From Satellites Ov1 15 And Ov1 16
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| Author | : Kenneth S. W. Champion |
| Publisher | : |
| Total Pages | : 32 |
| Release | : 1969 |
| Genre | : Artificial satellites |
| ISBN | : |
The objectives of satellites OV1-16 (Cannon Ball I) and OV1-15 (SPADES) were to measure atmospheric density and related properties in the lower thermosphere with particular emphasis on the altitude region 120 to 150 km. This region is where least data are available and where data are urgently required for Air Force Systems vehicles and for accurate calculations of the re- entry locations of satellites. To achieve an orbit at the lowest possible altitude the mass-to-area ratio of Cannon Ball I was maximized and a spherical shape chosen to optimize the accuracy of the drag density measurements. Both satellites were launched into a polar orbit on 11 July 1968. The initial perigee of Cannon Ball I was 148 km and the apogee 575 km. The initial perigee for SPADES was 158 km and the apogee 1850 km. A considerable amount of density data was obtained from orbital drag and from an onboard triaxial accelerometer on Cannon Ball I and from orbital drag, accelerometer, and ionization gauges on SPADES.
| Author | : Frank A. Marcos |
| Publisher | : |
| Total Pages | : 190 |
| Release | : 1972 |
| Genre | : Accelerometers |
| ISBN | : |
The report describes density results obtained from the ultrasenstive triaxial accelerometer system flown on the Air Force low-altitude density research satellite OV 1-15 (SPADES). A description of the spacecraft operation, the accelerometers, and the data reduction procedure is also given. The accelerometers measured the satellite deceleration induced by aerodynamic drag. Profiles of the neutral atmospheric density were derived directly from the drag data. Measurements were made from an altitude of 250 km down to perigee, nominally 160 km. Density profiles acquired from 14 July 1968 to 28 September 1968 are presented as Appendix A. Comparison of the density results to the appropriate Jacchia 1971 model atmosphere is given in Appendix B. (Author Modified Abstract).
| Author | : F. A. Marcos |
| Publisher | : |
| Total Pages | : 28 |
| Release | : 1975 |
| Genre | : Accelerometers |
| ISBN | : |
Accurate density measurements are required to develop predictive atmospheric models. Of particular concern is the altitude region below 250 km. Few measurements are presently available in this region and data are urgently required by the Air Force for accurate ephemeris, trajectory, and reentry predictions. Profiles of neutral atmospheric density obtained at low satellite altitudes in the southern hemisphere during geomagnetically quiet conditions are described in this report.
| Author | : Eunice C. Cronin |
| Publisher | : |
| Total Pages | : 644 |
| Release | : 1972 |
| Genre | : Military research |
| ISBN | : |
A systems analysis technique is applied to the scientific problem solving requirements of a major Air Force research organization to establish: The functional organization of a research support group; A valuable data base for a Customer User Library (CUL); and A Management Information System for scheduling, reporting and control. The report summarizes the functional organization of the Analysis and Simulation Branch of the Computation Center at AFCRL as derived from an analysis of the spectrum of analytical and computational problems originating in the Laboratories. A detailed description the structure and mode of operation of the Customer User Library is provided, together with a discussion of the associated Management Information System. An extensive listing of scientific problem abstracts is provided in the Appendices.
| Author | : Air Force Cambridge Research Laboratories (U.S.) |
| Publisher | : |
| Total Pages | : 400 |
| Release | : 1970 |
| Genre | : Geophysics |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 1040 |
| Release | : 1973 |
| Genre | : Aeronautics |
| ISBN | : |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
| Author | : Air Force Cambridge Research Laboratories (U.S.) |
| Publisher | : |
| Total Pages | : 214 |
| Release | : 1972 |
| Genre | : Military research |
| ISBN | : |
This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued from 1 January to 31 March 1972. Abstracts are included.
| Author | : F. A. Marcos |
| Publisher | : |
| Total Pages | : 24 |
| Release | : 1976 |
| Genre | : Accelerometers |
| ISBN | : |
The Cannon Ball II and SPADES satellites carried triaxial accelerometer systems for accurate measurement of neutral atmospheric density. Cannon Ball II was launched 6 August 1971 into a polar elliptic orbit in which the initial perigee was at the extremely low altitude of 132 km. SPADES was launched 11 July 1968 into a polar elliptic orbit in which the initial perigee was at 155 km. The data, analyzed to deduce an average density profile for each satellite for summer conditions in the northern hemisphere, are for the altitude region 135 to 250 km, where measurements have heretofore been extremely sparse. Comparisons were made with recent models and experimental data. These results are intended to be supplemented by those of lower-thermosphere studies now being carried out on accelerometer data from the Atmosphere Explorer satellites and a low-altitude Air Force satellite. Comprehensive analyses of accelerometer data low-altitude satellites will allow accurate modeling of the lower thermosphere. These models are required for improving calculation of the trajectories of Air Force systems vehicles and other spacecraft.
| Author | : |
| Publisher | : |
| Total Pages | : 1350 |
| Release | : 1973 |
| Genre | : Cosmic physics |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 168 |
| Release | : 1969 |
| Genre | : |
| ISBN | : |
