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  • GEOPHYSICS  (287)
  • ASTRONOMY  (93)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (92)
  • 1985-1989  (472)
  • 1988  (273)
  • 1987  (199)
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  • 1985-1989  (472)
Year
  • 1
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    Accurate radio and optical positions for the radio star HD 36705 (AB Doradus) (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Arc-second position measurements of the active star HD 36705 (AB Dor) and of the variable radio source found nearby are presented. These measurements show that the radio source is clearly identified with HD 36705 and not with the nearby red-dwarf star Rst 137B.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 100; 825-827
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    NASA TECHNICAL REPORTS
  • 2
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    The Hubble Space Telescope high speed photometer (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Hubble Space Telescope will provide the opportunity to perform precise astronomical photometry above the disturbing effects of the atmosphere. The High Speed Photometer is designed to provide the observatory with a stable, precise photometer with wide dynamic range, broad wavelenth coverage, time resolution in the microsecond region, and polarimetric capability. Here, the scientific requirements for the instrument are examined, the unique design features of the photometer are explored, and the improvements to be expected over the performance of ground-based instruments are projected.
    Keywords: ASTRONOMY
    Type: NASA, Ames Research Center, Second Workshop on Improvements to Photometry; p 1-15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Space experiments with particle accelerators (SEPAC): Description of instrumentation (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: SEPAC (Space Experiments with Particle Accelerators) flew on Spacelab 1 (SL 1) in November and December 1983. SEPAC is a joint U.S.-Japan investigation of the interaction of electron, plasma, and neutral beams with the ionosphere, atmosphere and magnetosphere. It is scheduled to fly again on Atlas 1 in August 1990. On SL 1, SEPAC used an electron accelerator, a plasma accelerator, and neutral gas source as active elements and an array of diagnostics to investigate the interactions. For Atlas 1, the plasma accelerator will be replaced by a plasma contactor and charge collection devices to improve vehicle charging meutralization. This paper describes the SEPAC instrumentation in detail for the SL 1 and Atlas 1 flights and includes a bibliography of SEPAC papers.
    Keywords: GEOPHYSICS
    Type: NASA-TM-89728 , NAS 1.15:89728
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Observations of the 8 December 1987 occultation of AG+40 deg 0783 by 324 Bamberga (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The occultation of AG+40 deg 0783 by 324 Bamberga on 8 December 1987 was observed at 13 sites in the United States, Japan, and China. At four sites the event was observed photoelectrically; the other observations were visual. A least-squares fit of a circular limb profile to the data gives a diameter of 227.6 + or - 1.9 km. However, this solution is inconsistent with a negative visual observation near the northern edge of the ground track. The inconsistency cannot be removed by assuming an elliptical profile. The data suggest that Bamberga, despite its low-amplitude lightcurve, may depart significantly from a spherical or ellipsoidal shape. The asteroid also appears to be at least 10 percent smaller than indicated by infrared radiometry.
    Keywords: ASTRONOMY
    Type: NASA-CR-184785 , NAS 1.26:184785
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  • 5
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    Particle acceleration and wave emissions associated with the formation of auroral cavities and enhancements (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A unified model is presented which interrelates the various processes involved in auroral particle acceleration and the associated wave emissions, and it is shown how energy is coupled from the magnetosphere into the ionosphere. The phenomena in the magnetotail which can provide the source of free energy for the perpendicular electrostatic shocks are identified along with the associated potential structures in the nightside auroral region. The characteristics of the particle acceleration produced by the shock are described, including efficiency and energy transport between magnetospheric and ionospheric plasmas, the properties of the particle distributions throughout the shock region and return current regions, and the associated wave emissions. The source of free energy for the generation of ion conics is identified, as are the signatures for the formation of plasma cavities and/or enhancements.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 14567-14
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    NASA TECHNICAL REPORTS
  • 6
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    The solar dynamic radiator with a historical perspective (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A historical perspective on pumped-fluid loop space radiators provides a basis for the design of the Space Station Solar Dynamic (SD) power module radiator. SD power modules, capable of generating 25 kW (electrical) each, are planned for growth in Station power requirements. The Brayton cycle SD module configuration incorporates a pumped-fluid loop radiator that must reject up to 99 kW (thermal). The thermal/hydraulic design conditions in combination with required radiator orientation and packaging envelope form a unique set of constraints as compared to previous pumped-fluid loop radiator systems. Nevertheless, past program successes have demonstrated a technology base that can be applied to the SD radiator development program to ensure a low risk, low cost system.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-100972 , E-4265 , NAS 1.15:100972 , Intersociety Energy Conversion Engineering Conference; Jul 31, 1988 - Aug 05, 1988; Denver, CO; United States
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    NASA TECHNICAL REPORTS
  • 7
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    A complete sample of flat-spectrum radio sources from the Parkes 2.7 GHz survey (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A complete sample of about 400 flat-spectrum radio sources from the Parkes 2700 MHz catalog with fluxes of greater than 0.5 is presented. The present sample covers all right ascensions and declinations from +10 deg to -45 deg, but excludes the galactic plane. No significant difference is found in the number-magnitude or number-redshift distributions for the flat spectrum and steep-spectrum radio quasars, in agreement with previous results for stronger sources.
    Keywords: ASTRONOMY
    Type: Observational cosmology; Aug 25, 1986 - Aug 30, 1986; Beijing; China
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    NASA TECHNICAL REPORTS
  • 8
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    The HITRAN database - 1986 edition (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A description and summary of the latest edition of the AFGL high-resolution transmission molecular absorption database (HITRAN) parameters are presented. This new database combines the information for the seven principal atmospheric absorbers and twenty-one additional molecular species previously contained on the AFGL atmospheric absorption line parameter compilation and on the trace gas compilation. In addition to updating the parameters on earlier editions of the compilation, new parameters have been added to this edition such as the self-broadened half-width, the temperature dependence of the air-broadened half-width, and the transition probability. The database contains 348,043 entries between 0 and 17,900/cm. A FORTRAN program is now furnished to allow rapid access to the molecular transitions and for the creation of customized output. A separate file of molecular cross sections of 11 heavy molecular species, applicable for qualitative simulation of transmission and emission in the atmosphere, has also been provided.
    Keywords: GEOPHYSICS
    Type: AD-A188435 , AFGL-TR-87-0283 , Applied Optics (ISSN 0003-6935); 26; 4058-409
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    NASA TECHNICAL REPORTS
  • 9
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    Geomagnetic equatorial anomaly in zonal plasma flow (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The observation of a geomagnetic signature in the zonal eastward plasma flow, which is a striking feature of the equatorial ionosphere in the evening quadrant is reported. These observations were derived fronm (E x B)/B-squared measurements made with the cylindrical double-floating-probe experiment carried on the Dynamics Explorer 2 satellite. The signature consists of a crest-trough-crest effect in the latitude dependence of the eastward plasma flow with the crests at + or - 8 dip latitude and the trough nearly centered at the dip equator at all geographic longitudes. This phenomenon can be readily interpreted in terms of the altitude dependence of the F region dynamo electric field, and it is related to dip equator signatures in the plasma density and the magnetic declination which have been reported earlier.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 311-315
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  • 10
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    F region electron temperature signatures of the plasmapause based on Dynamics Explorer 1 and 2 measurements (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A large DE 1 and 2 database covering all local times is used to explore the relationship between electron temperature (Te) signatures in the F region and plamaspheric density structures. The quiet time Te signature remains in the vicinity of 60 deg invariant latitude at all local times, while the plasmapause is found to bulge to about 60 deg at 1500 LT. The plasmasphere in the bulge region is shown to exhibit an internal feature in the vicinity of 60 deg which takes the form of a sharp H(+) gradient. It is suggested that the light-ion gradient may represent a recently created sharp boundary between an old plasmasphere and a new plasmasphere. The present Te characteristics are consisent with plasmasphere depletion and refilling time constants.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 1896-190
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