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  • ASTROPHYSICS  (4)
  • 1990-1994  (4)
  • 1945-1949
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  • 1
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    Estimate of the distance to the solar wind termination shock from gradients of anomalous cosmic ray oxygen (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The radial gradient of anomalous cosmic ray oxygen measured instantaneously between Voyager 2 and Pioneer 10 during 1985-1988 is correlated with the inferred tilt of the heliospheric neutral sheet. This is consistent with a simple model in which the radial gradient is related to the length of the neutral sheet between the two spacecraft. With this model we show that the radial gradient and the tilt of the neutral sheet near the solar wind termination shock can be inferred from the Voyager and Pioneer observations. By comparing the time history of the inferred tilt with that derived from solar observations, we estimate that the termination shock was at 62 +5/-7 AU at solar minimum in 1987. At solar maximum the shock should be located at about 90 AU due to the increased pressure of the solar wind.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A9; p. 15,165-15,168.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Gamma-ray continuum and line observations of SN 1987A (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: The Caltech gamma-ray imaging telescope observed the hard X-ray and gamma-ray emission from SN 1987A as it evolved between 1987 May and 1989 April, in a series of four balloon flights from Alice Springs, NT, Australia. Observations of the Crab Nebula and Pulsar provided in-flight data on pointing accuracy and instrument function for each flight. Results presented here include our measurements on November 18, 1987 (D268) and April 12, 1988 (D414) of both line emission at 847 and 1238 keV from the decay of Co-56, and Compton-scattered continuum above 50 keV. Upper limits for both line and continuum emission were obtained on May 20, 1987 (D86) and April 4, 1989 (D771). For the D268 and D414 continuum measurements, our results are best-fit by a differential power law of the form dN/dE = kE exp -gamma (sq cm s keV) for the energy range 50-800 keV. Our corresponding line measurements were fit with Gaussian profiles, containing additional terms for the underlying continuum. We compare our flux measurements and upper limits to those from other experiments and to predictions of theoretical models.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 412; 1; p. 203-212.
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    NASA TECHNICAL REPORTS
  • 3
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    Recent results of gamma-ray imaging observations of the Galactic center and Crab/A0535 + 26 regions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Imaging observations at hard X-ray and gamma-ray energies of the Galactic center and Crab/A0535 + 26 regions are presented. The measurements were made in a series of high altitude balloon flights of a coded aperture gamma-ray telescope developed by Caltech. The first coded aperture images of the Galactic center region above 35 keV reveal a strong gamma-ray source located 0.7 + or - 0.1 deg away from the Galactic nucleus, consistent with the known X-ray source 1E1740.7 - 2942. In addition, a second source consistent in position with GX354 + 0 has been observed. Flux estimates and upper limits from two other known sources are also discussed. Coded aperture observations of the Crab and A0535 + 26 are presented, demonstrating the ability of coded aperture instruments to observe multiple time variable sources simultaneously.
    Keywords: ASTROPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 11; 8 19
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    NASA TECHNICAL REPORTS
  • 4
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    Radial diffusion of relativistic electrons in Neptune's magnetosphere (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Measurements of greater than or = 1 MeV electrons in Neptune's magnetosphere from L approximately = 4 to 14 are well represented by solutions of a model radial diffusion equation that includes losses due to absorption by the satellite Proteus. The model provides estimates of the radial diffusion coefficient, which is 5 x 10(exp -8) (L/5)(exp 8)/s, and the outer boundary energy spectrum, which is an exponential with an e-folding energy of 0.1 MeV. The diffusion coefficient is consistent with theoretical estimates based on the assumption that diffusion is driven by atmospheric neutral winds.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 21; 15; p. 1579-1582
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    NASA TECHNICAL REPORTS
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