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  • 1985-1989  (4)
  • 1965-1969
  • 1985  (4)
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  • 1985-1989  (4)
  • 1965-1969
Year
  • 1
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    Gamma ray burst size-frequency distributions: Spectral selection effects (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of spectral variation on the detection of gamma ray bursts were investigated. Selection biases resulting from these effects can account for the reported deviation of the observed size-frequency distribution in peak energy flux from that expected for a simple uniform distribution of sources. Thus these observations as yet provide no clear evidence for structure in the burst source distribution. Because of selection biases, the intrinsic average temperature of the bursts is much harder (kT approximately MeV) than the observed average (approximately 200 KeV).
    Keywords: SPACE RADIATION
    Type: OG-1.2-3 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 37-40; NASA-CP-2376-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Interstellar turbulence, random density variations, and scintillation measurements (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The presence of random electron variations suggests that the ionized interstellar medium is turbulent. In the interstellar plasma the presence of power spectra of such variations extending to spatial scales much less than a Coulomb mean free path, Lambda sub c, is required by analyses of measurements of scintillation and angular broadening of pulsar radio signals. The existence of corresponding variations in magnetic field strength could efficiently scatter cosmic rays and thus constrain cosmic-ray propagation. Unfortunately both the origin of the electron density variations and mechanisms by which these variations couple to fluctuations in magnetic field strength are unknown. It is conjectured that the small-scale density variations are generated by the convective distortion of initially large-scale isobaric entropy structures in the turbulent interstellar plasma. An investigation of the spectra of turbulent entropy structures, velocity, and magnetic fields at small spatial scales is made. The modifier small is employed to characterize length scales much less than the dimension, L, containing the bulk of the turbulent energy.
    Keywords: SPACE RADIATION
    Type: OG-7.2-13 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 63-66; NASA-CP-2376-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Galactic distribution of interstellar Al-26 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A narrow cosmic gamma ray line at 1809 keV was discovered which was interpreted as resulting from the decay of approximately 3 M sub theta of Al-26 residing in the galactic disk. While its intrinsic width was unresolved by the HEAO 3 spectrometer, a (1 sigma) limit of 3 keV FWHM was obtained; this corresponds to bulk motions of v 250 km/s, which is consistent with material at rest in the ISM. Sites which have been suggested include type II supernovae and massive stars which are members of the extreme population I, as well as novae and red giants which are associated with an older disk population. The HEAO 3 data was used to distinguish between these two stellar populations.
    Keywords: SPACE RADIATION
    Type: OG-3.2-3 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 357-360; NASA-CP-2376-VOL-1
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  • 4
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    Diffuse galactic annihilation radiation from supernova nucleosynthesis (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The propagation of MeV positrons in the outer ejecta of type I supernovae was investigated. It was found that the positrons created at times of approx 100 days propagated along magnetic field lines in the outer ejecta without any appreciable pitch-angle scattering or excitation of hydromagnetic waves. The lack of significant pitch-angle scattering is well consistent with models of wave excitation and scattering by resonant interactions. This occurs because time periods to scatter the particles or to excite waves are significantly longer than escape times. Thus it is expected that, when positrons are not coupled to the ejecta by Coulomb collisions, they escape from the relatively cold, dense ejecta and reside predominantly in the tenuous, hotter, shock-heated interstellar gas. In the tenuous shock-heated gas the positron lifetime against annihilation is much greater than lifetimes in the dense ejectra. Thus the production of steady-state diffuse annihilation radiation by some fraction of these escaped positrons seems probable.
    Keywords: SPACE RADIATION
    Type: OG-3.2-8 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 365-368; NASA-CP-2376-VOL-1
    Format: application/pdf
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