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  • Other Sources  (3)
  • NASA Technical Reports  (3)
  • 1990-1994  (3)
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  • Other Sources  (3)
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  • 1
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    An Advanced Simulation Framework for Parallel Discrete-Event Simulation (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Discrete-event simulation (DEVS) users have long been faced with a three-way trade-off of balancing execution time, model fidelity, and number of objects simulated. Because of the limits of computer processing power the analyst is often forced to settle for less than desired performances in one or more of these areas.
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    NASA TECHNICAL REPORTS
  • 2
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    Directivity of 100-500 keV solar flare hard X-ray emission (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We have identified 28 solar flares simultaneously observed by a SIGNE detector aboard the Venera 13 and Venera 14 spacecraft and the Hard X-Ray Burst Spectrometer (HXRBS) aboard the Solar Maximum Mission (SMM), over a wide range of observing angles. Fourteen of them were also observed by the Gamma Ray Spectrometer (GRS) on SMM and were included in a study of the directivity of solar X-radiation. The SIGNE and HXRBS energy coverages overlap in the 50-500 keV range, allowing a detailed comparison of energy spectra. Using this database, we have conducted stereoscopic studies of flare hard X-ray anisotropy. It is found that the 100-500 keV directivity is less than 3, both for the entire set of 28 flares and for the 14 flares which gave evidence for directivity in the SMM GRS study. We conclude that solar flare X-ray directivity can only be marginally present in our energy/observing angle range.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 426; 2; p. 758-766
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    NASA TECHNICAL REPORTS
  • 3
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    The optical and X-ray content of the 1992 May 1 gamma-ray burst error box (1994)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A gamma-ray burst which occurred on 1992 May 1 was observed by three spacecraft in the third interplanetary network, and rapidly localized to a small error box. The coordinates were promptly circulated to a wide astronomical community, and radio, optical, and X-ray counterpart searches were carried out. A weak X-ray source was found in the error box, and two radio sources are discovered outside the error box, but in alignment with the X-ray source. The X-ray source position contains approximately 25 optical objects down to 23d magnitude. We discuss the prospects for identifying the burster counterpart.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal Supplement Series (ISSN 0067-0049); 92; 2; p. 655-657
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    NASA TECHNICAL REPORTS
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