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  • 1
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    COMPTEL solar flare observations (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: COMPTEL as part of a solar target of opportunity campaign observed the sun during the period of high solar activity from 7-15 Jun. 1991. Major flares were observed on 9 and 11 Jun. Although both flares were large GOES events (greater than or = X10), they were not extraordinary in terms of gamma-ray emission. Only the decay phase of the 15 Jun. flare was observed by COMPTEL. We report the preliminary analysis of data from these flares, including the first spectroscopic measurement of solar flare neutrons. The deuterium formation line at 2.223 MeV was present in both events and for at least the 9 Jun. event, was comparable to the flux in the nuclear line region of 4-8 MeV, consistent with Solar-Maximum Mission (SSM) Observations. A clear neutron signal was present in the flare of 9 Jun. with the spectrum extending up to 80 MeV and consistent in time with the emission of gamma-rays, confirming the utility of COMPTEL in measuring the solar neutron flux at low energies. The neutron flux below 100 MeV appears to be lower than that of the 3 Jun. 1982 flare by more than an order of magnitude. The neutron signal of the 11 Jun. event is under study. Severe dead time effects resulting from the intense thermal x-rays require significant corrections to the measured flux which increase the magnitude of the associated systematic uncertainties.
    Keywords: SOLAR PHYSICS
    Type: NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop; p 470-479
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  • 2
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    High energy flare physics group summary (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The contributions of the High Energy Flare Physics Special Session in the American Astronomical Society Solar Physics Division Meeting are reviewed. Oral and poster papers were presented on observatories and instruments available for the upcoming solar maximum. Among these are the space-based Gamma Ray Observatory, the Solar Flare and Cosmic Burst Gamma Ray Experiment on the Ulysses spacecraft, the Soft X Ray Telescope on the spacecraft Solar-A, and the balloon-based Gamma Ray Imaging Device. Ground based observatories with new capabilities include the BIMA mm-wave interferometer (Univ. of California, Berkeley; Univ. of Illinois; Univ. of Maryland), Owens Valley Radio Observatory and the Very Large Array. The highlights of the various instrument performances are reported and potential data correlations and collaborations are suggested.
    Keywords: SOLAR PHYSICS
    Type: NASA, Goddard Space Flight Center, Max '91 Workshop 2: Developments in Observations and Theory for Solar Cycle 22; p 1-16
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  • 3
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    The propagation of solar flare particles in a coronal loop (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A time-dependent diffusion equation with velocity-dependent diffusion and energy-loss coefficients was solved for the case where energetic solar particles are injected into a coronal loop and then diffuse out the ends of the loop into the lower corona/chromosphere. The solution yields for the case of relativistic electrons, precipitation rates and populations which are necessary for calculating thick and thin target X-ray emission. It follows that the thick target emission is necessarily delayed with respect to the particle acceleration on injection by more than the mere travel time of the particle over the loop length. In addition the time-dependent electron population at the top of the loop is calculated. This is useful in estimating the resulting micron-wave emission. The results show relative timing differences in the different emission processes which are functions of particle species, energy and the point of injection of the particles into the loop. Equivalent quantities are calculated for non-relativistic protons.
    Keywords: SOLAR PHYSICS
    Type: NASA. Goddard Space Flight Center Rapid Fluctuations in Solar Flares; p 383-392
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  • 4
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    A comparison between Lageos laser ranging and VLBI determined baselines (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Two independent measurement techniques, Lageos satellite laser ranging (SLR), and very long baseline interferometry (VLBI) are compared in the measurement of distances (or baselines) between several locations in the continental U.S. The results of this analysis is summarized where both the SLR and VLBI baseline lengths and their differences (SLR minus VLBI) are presented. A comparison of the 22 baselines shows a mean difference of 1.0 + or - 1.1 cm with a scatter about zero of 5.2 cm. No apparent systematic scale difference between the networks is evident. A map of the baselines is included and indicates their differences, SLR minus VLBI, in centimeters.
    Keywords: LASERS AND MASERS
    Type: Res. Activities of the Geodyn. Branch; 4 p
    Format: text
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  • 5
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    Adhesion of silicates in ultrahigh vacuum. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Adhesion force of silicates in ultrahigh vacuum as function of load force, temperature, surface roughness and crystal orientation
    Keywords: SPACE SCIENCES
    Type: JOURNAL OF GEOPHYSICAL RESEARCH
    Format: text
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  • 6
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    Experimental investigation of ultra-high vacuum adhesion as related to the lunar surface fourth quarterly progress report and first year summary, 1 apr. - 30 jun. 1965 (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-24
    Description: Ultrahigh vacuum adhesion of silicates in relation to lunar surface
    Keywords: SPACE SCIENCES
    Type: NASA-CR-67011 , SM-47914
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  • 7
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    Experimental investigation of ultra-high vacuum adhesion as related to the lunar surface third quarterly progress report, 1 jan. - 31 mar. 1965 (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Ultrahigh vacuum frictional-adhesional behavior of silicates for lunar surface studies
    Keywords: SPACE SCIENCES
    Type: NASA-CR-62220
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  • 8
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    Time and frequency stability for the Crustal Dynamics Project (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Very long base interferometry (VLBI) and laser ranging to artificial satellites and the Moon were used to determined vector baselines between stations with precisions of about one part in 10 to the 8th power. Deformations and strain accumulations in active earthquake regions were determined by making frequent measurements of baselines between many stations in active areas near plate boundaries.
    Keywords: LASERS AND MASERS
    Type: Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 649-662
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  • 9
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    Experimental investigation of ultrahigh vacuum adhesion as related to the lunar surface Sixth quarterly progress report, 1 Oct. - 31 Dec. 1965 (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Ultrahigh vacuum frictional adhesional behavior of silicates related to lunar surface - modifications, sorption pump bank, cleavage device, and roughness effects
    Keywords: SPACE SCIENCES
    Type: NASA-CR-69246
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  • 10
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    Experimental investigation of ultra-high vacuum adhesion as related to the lunar surface Seventh quarterly progress report, 1 Jan. - 31 Mar. 1966 (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Silicate ultrahigh vacuum frictional and adhesional behavior as related to lunar surface
    Keywords: SPACE SCIENCES
    Type: NASA-CR-74625
    Format: application/pdf
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