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  • Polymer and Materials Science  (3,130)
  • SPACE RADIATION  (861)
  • Organic Chemistry  (671)
  • 1985-1989  (4,662)
  • 1975-1979
  • 1985  (4,662)
Collection
Keywords
Publisher
Years
  • 1985-1989  (4,662)
  • 1975-1979
Year
  • 1
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    The large scale dynamics of the outer heliosphere and the long-term modulation of galactic cosmic rays (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The network of cosmic ray observatories reaching across the heliosphere has given new insight into the process of solar modulation, establishing that the decreases occur principally in the outer heliosphere and are produced by interplanetary flow systems; that the hysteresis effects appear to be produced by changes in the rigidity dependence of the diffusion coefficient and that the predicted effects on the cosmic ray gradients associated with the reversal of the solar magnetic field polarity are not observed.
    Keywords: SPACE RADIATION
    Type: SH-4.7-3 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 193-196; NASA-CP-2376-VOL-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Cosmic ray modulation and turbulent interaction regions near 11 AU (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: When Voyager 2 was near 11 AU, the counting rate of nuclei approx 75 MeV/nucleon decreased during the interval from July, 1982 to November, 1982, and it increased thereafter until August, 1983. A decrease in cosmic ray flux was generally associated with the passage of an interaction region in which the magnetic field strength B was higher than that predicted by the spiral field model, B sub p. Several large enhancements in B/B sup p were associated with merged interaction regions which probably resulted from the interaction of two or more distinct flows. During the passage of interaction regions the cosmic ray intensity decreased at a rate proportional to (B/B sup p -1), and during the passage of rarefaction regions (where B/B sup p 1) the cosmic ray intensity increased at a constant rate. The general form of the cosmic ray intensity profile during this approx 13 month minicycle can be described by integrating these relations using the observed B(+). Latitudinal variations of the interaction regions and of the short-term cosmic ray variations were identified.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Heavy Cosmic Ray Measurement Aboard Spacelab-1 (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A stack of CR-39 plastic track detectors was exposed to cosmic radiation during the 10 days mission aboard Spacelab-1. A part of the stack was rotated one revolution within 7 days. The impact time of most of the particles was correlated with the orbit position of the shuttle and thus with geomagnetic field parameters. The analysis of heavy particles with charge Z greater than or equal to 6 in the energy range 50-150 MeV per nucleon with special emphasis on geomagnetically forbidden particles is reported.
    Keywords: SPACE RADIATION
    Type: SH-10.1-7 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5; p 537
    Format: application/pdf
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  • 4
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    Cosmic ray modulation and merged interaction regions (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Beyond several AU, interactions among shocks and streams give rise to merged interaction regions in which the magnetic field is turbulent. The integral intensity of . 75 MeV/Nuc cosmic rays at Voyager is generally observed to decrease when a merged interaction region moves past the spacecraft and to increase during the passage of a rarefaction region. When the separation between interaction regions is relatively large, the cosmic ray intensity tends to increase on a scale of a few months. This was the case at Voyager 1 from July 1, 1983 to May 1, 1984, when the spacecraft moved from 16.7 to 19.6 AU. Changes in cosmic ray intensity were related to the magnetic field strength in a simple way. It is estimated that the diffusion coefficient in merged interaction regions at this distance is similar to 0.6 x 10 to the 22nd power sq cm/s.
    Keywords: SPACE RADIATION
    Type: SH-4.1-11 , 19th Intern. Cosmic Ray Conf - Vol. 4; p 396-399; NASA-CP-2376-VOL-4
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  • 5
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    Cosmic ray modulation and turbulent interaction regions near 11 AU (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: When Voyager 2 was near 11 AU, the counting rate of nuclei approx 75 MeV/nucleon decreased during the interval from July, 1982 to November, 1982, and it increased thereafter until August, 1983. A decrease in cosmic ray flux was generally associated with the passage of an interaction region in which the magnetic field strength B was higher than that predicted by the spiral field model, B sub p. Several large enhancements in B/B sup p were associated with merged interaction regions which probably resulted from the interaction of two or more distinct flows. During the passage of interaction regions the cosmic ray intensity decreased at a rate proportional to (B/B sup p -1), and during the passage of rarefaction regions (where B/B sup p 1) the cosmic ray intensity increased at a constant rate. The general form of the cosmic ray intensity profile during this approx 13 month minicycle can be described by integrating these relations using the observed B(t). Latitudinal variations of the interaction regions and of the short-term cosmic ray variations were identified.
    Keywords: SPACE RADIATION
    Type: NASA-TM-86193 , NAS 1.15:86193
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Research in particles and fields (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research activities in Cosmic Rays, Gamma Rays, and Astrophysical Plasmas supported under NASA Grant NGR 05-002-160 are discussed. The report is divided into sections which describe the activities, followed by a bibliography. This group's research program is directed toward the investigation of the astrophysical aspects of cosmic rays and gamma rays and of the radiation and electromagnetic field environment of the Earth and other planets. These investigations are carried out by means of energetic particle and photon detector systems flown on spacecraft and balloons.
    Keywords: SPACE RADIATION
    Type: NASA-CR-176361 , NAS 1.26:176361
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  • 7
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    Research of advanced techniques for X-ray detectors and telescopes with applications to rockets and the LAMAR facility (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A program for the development of high throughput instrumentation for X-ray astronomy based upon focusing optics is being carried out by the Smithsonian Astrophysical Observatory. The instrumentation is applicable to investigations requiring large area focusing optics for direct imaging or dispersive spectroscopy. The long range goals of this program are the development of telescopes and gratings for future major X-ray astronomy facilities, including additions to the LAMAR OSS-2/SHEAL experiment after the initial flights. Tests of the devices and their more immediate utilization in scientific investigations can be carried out with SPARTAN payloads deployed and retrieved by the Space Shuttle. However, the present backlog of approved SPARTAN missions is longer than the three-year duration of the program described in this program. Laboratory studies and breadboarding of instrumentation are discussed.
    Keywords: SPACE RADIATION
    Type: NASA-CR-176161 , NAS 1.26:176161 , SAR-16 , SAR-17
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  • 8
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    Research in particles and fields (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research activities in Cosmic Rays Gamma Rays, and Astrophysical Plasmas are covered The investigation of the astrophysical aspects of cosmic rays and gamma rays and of the radiation and electromagnetic field environment of the Earth and other planets are studied. These investigations are carried ut by means of energetic particle and photon detector systems flown on spacecraft and balloons. The emphasis is on precision measurements with high resolution in charge mass and energy. An extensive bibliography is given.
    Keywords: SPACE RADIATION
    Type: NASA-CR-176069 , NAS 1.26:176069
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  • 9
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    Cosmic ray simulation and testing program (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Single event upset (SEU) and latchup vulnerabilities were determined for a number of parts of interest to NASA space programs. In cases where a threshold linear energy transfer (LET) for SEU could be measured, an upset rate in a low inclination Space Shuttle orbit was computed. The predicted upset rates are extremely low, except for the devices with LET thresholds below the geomagnetic cutoff for altitude and inclination of the Space Shuttle orbit. While some of the devices do exhibit latchup, the cross sections and threshold LETs are such that the risk associated with flying these devices in low, near equatorial orbits is small if not negligible.
    Keywords: SPACE RADIATION
    Type: NASA-CR-177860 , NAS 1.26:177860
    Format: application/pdf
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  • 10
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    Space radiation studies (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The overall data flow diagram for the nuclear radiation monitor to fly on Spacelab 2 was revised. The use of structured techniques for the software design appears to be working well. An example of the PASCAL pseudocode written to develop and document the software design is included.
    Keywords: SPACE RADIATION
    Type: NASA-CR-171410 , NAS 1.26:171410
    Format: application/pdf
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