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  • Other Sources  (5)
  • 2020-2024
  • 1980-1984  (5)
  • 1850-1859
  • 1984  (1)
  • 1983  (4)
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  • 2020-2024
  • 1980-1984  (5)
  • 1850-1859
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  • 1
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    A quantitative test of solar modulation theory - The proton, helium, and electron spectra from 1965 through 1979 (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The predictions of a conventional, spherically symmetric model of solar modulation have been compared with the measured spectra of positively and negatively charged galactic cosmic-ray particles at 1 AU throughout the 1965-1976 solar cycle and through the enhanced modulation of 1979. For the proton/helium, proton/electron, and helium/electron flux ratios, there is remarkably good agreement between theory and experiment, except for small differences in 1965 and 1969. Possible systematic experimental errors are discussed, and it is concluded that: (1) the 11 year modulation process is largely independent of the sign of the particle charge; and (2) the assumption of steady state is a fairly good approximation for long term modulation.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 275; L15-L18
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The path-length distribution for galactic cosmic-ray propagation - An energy-dependent depletion of short path lengths (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is shown that at low energies, the depletion of short path lengths in the interstellar cosmic-ray path-length distribution is a function of energy, decreasing in magnitude with increasing energy. The analysis leading to this conclusion is based on the comparison of compiled data for the B/C and sub-Fe/Fe ratios at 0.08-50 GeV per nucleon, with the results of detailed galactic propagation and solar modulation calculations, which include experimental values for the important nuclear cross sections. This energy dependence of the depletion resolves some of the conflicts between previous reports on the question of short path lengths and may be explained by models including a matter distribution around discrete sources or, possibly, by models invoking waves generated by particle-magnetic field interactions in the Galaxy.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 280; L13-L17
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The anomalous helium component in the heliosphere - The 1965 versus the 1972-1977 solar minimum (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The anomalous He-4 component, hereafter He(A), was first observed in the galactic cosmic-ray helium spectrum at energies below about 60 MeV per nucleon in 1972 at the beginning of the extended period of minimum solar modulation, 1972-1977, after which period it again disappeared as solar modulation increased in the new solar activity cycle. This component was not apparent during the 1965 solar minimum. It is found that the helium spectrum measured during a short interval of enhanced modulation in 1974-1975 shows the same level as the He spectrum measured during 1965. This fact demonstrates that the absence of He(A) in 1965 can be explained as the consequence of a greater level of solar modulation at low energies in 1965 than in most of the 1972-1977 solar minimum. It is concluded that He(A) may be present at all times in the outer heliosphere and be observable at successive solar minima if the residual solar modulation is sufficiently low, as in most of the 1972-1977 minimum.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 274; L93-L97
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    NASA TECHNICAL REPORTS
  • 4
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    Evidence for an energy dependence in the short pathlengths of the cosmic ray pathlength distribution (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The energy dependence of the short pathlengths in the cosmic ray pathlength distribution is investigated in a galactic propagation plus solar modulation calculation. In order to reproduce, simultaneously, the compiled B/C and sub-Fe/Fe measurements, an energy dependent deficiency of short pathlengths is required which is largest at low energies and becomes negligible above a few GeV/nucleon. Such behavior could imply a significant contribution from matter in the vicinity of the cosmic ray source or the acceleration site.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 22, 1983 - Sep 03, 1983; Bangalore; India
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A pioneer-class Mars aeronomy mission (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary studies of a Pioneer-class Mars-orbiter aeronomy mission are reviewed. The aeronomy objectives and payload are discussed, along with the mission requirements, spacecraft design requirements, possible spacecraft designs, and total mission costs. It is shown that existing earth-orbiting communication satellites can be easily modified for the aeronomy mission and that the total mission cost should be between $150 million and $185 million in 1982 dollars.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 83-0520 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 10, 1983 - Jan 13, 1983; Reno, NV
    Format: text
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    NASA TECHNICAL REPORTS
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