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  • ASTROPHYSICS  (3)
  • ASTRONAUTICS (GENERAL)  (1)
  • 1985-1989  (4)
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  • 1
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    HIEN-LO: An experiment for charge determination of cosmic rays of interplanetary and solar origin (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The experiment is designed to measure the heavy ion environment at low altitude (HIEN-LO) in the energy range 0.3 to 100 MeV/nucleon. In order to cover this wide energy range a complement of three sensors is used. A large area ion drift chamber and a time-of-flight telescope are used to determine the mass and energy of the incoming cosmic rays. A third omnidirectional counter serves as a proton monitor. The analysis of mass, energy and incoming direction in combination with the directional geomagnetic cut-off allows the determination of the ionic charge of the cosmic rays. The ionic charge in this energy range is of particular interest because it provides clues to the origin of these particles and to the plasma conditions at the acceleration site. The experiment is expected to be flown in 1988/1989.
    Keywords: ASTRONAUTICS (GENERAL)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Spatial dependence of the local diffusion coefficient measured upstream of the November 12, 1978 interplanetary traveling shock (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Characteristics of wuprathermal particles accelerated by quasi-parallel interplanetary traveling shocks have been generally explained in terms of a first order Fermi mechanism. Such models require diffusive scattering of particles upstream of the shock. This scattering is characterized by a local diffusion coefficient, kappa, which is determined by the local power density of waves in the upstream region. The dependence of the diffusion coefficient of suprathermal upstream protons on distance from the November 12, 1978 interplanetary traveling shock using a different approach is studied. Unlike previous studies this method, which is based on measurements of particle streaming and intensity gradients, does not rely on predictions. The local spatial variations of Kappa upstream of the November 12, 1978 shock have been chosen for study because the characteristics of this quasi-parallel shock have been extensively studied, and also because of its favorable geometry (i.e. B field nearly radial).
    Keywords: ASTROPHYSICS
    Type: SH-1.5-12 , 19th Intern. Cosmic Ray Conf - Vol. 4; p 182-185; NASA-CP-2376-VOL-4
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    NASA TECHNICAL REPORTS
  • 3
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    Comet Giacobini-Zinner - In situ observations of energetic heavy ions (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Conclusive evidence is presented for the existence of heavy energetic, singly charged cometary ions within 1.5 million km of comet Giacobini-Zinner. The most direct evidence for establishing the mass of these ions was obtained from an analysis of the energy signals in one of the solid state detector on board the International Cometary Explorer. Maximum fluxes were recorded approximately one hour before and after closest approach to the cometary nucleus. Transformation of the particle angular distribution observed at approximately 50,000 km radial distance from the comet, during the inbound pass into a rest frame in which the distributions are nearly isotropic, requires a transformation velocity that is consistent with the local solar wind velocity (assuming these particles are primarily singly ionized with a mass of 18 + or - 6 amu). It is implied that these water-group ions underwent strong pitch angle scattering subsequent to ionization and that they were accelerated or heated. The derived ion density, approximately 0.1/cu cm, is consistent with a crude model for the production and transport of pickup ions.
    Keywords: ASTROPHYSICS
    Type: Science (ISSN 0036-8075); 232; 366-369
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Cometary pick-up ions observed near Giacobini-Zinner (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The number and energy density of cometary water-group ions observed near Comet Giacobini-Zinner are derived using the rest-frame distribution functions. The data reveal that density profiles of inbound and outbound passes and their shape correlate with pick-up ion production model predictions. The lose rate and production rate of water-group cometary molecules calculated from predicted and measured density profiles are 2 x 10 to the -6th/sec and 2.6 x 10 to the 28th/sec respectively. The shapes of the distribution functions are examined to study the solar wind/cometary ions interaction process.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 251-254
    Format: text
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