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  • LUNAR AND PLANETARY EXPLORATION  (81)
  • SPACE RADIATION  (44)
  • Lunar and Planetary Science and Exploration  (6)
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  • 1
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    Neptune's magnetic field - Calculation of field geometric invariants derived from the I8E1 GSFC/BRI model (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: L shell values along the Voyager 2 encounter trajectory and those associated with the N1 through N6 moons and N1R through N6R rings of Neptune are computed numerically on the basis of a simplified description of the Neptunian magnetic field derived from the Goddard Space Flight Center/Bartol Research Institute I8E1 model, which includes internal terms up to and including the octupole (but no external terms). Like Uranus, the large tilt between the dipole term and the rotation axis causes the moons and rings to sweep a very large range of L shells. Their orbital motion introduces additional periodicities, causing the maxima and minima in L space to vary systematically with time.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 98; A7; p. 11,275-11,284.
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  • 2
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    Neptune's polar cusp region - Observations and magnetic field analysis (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: This paper confirms and extends the results of Szabo et al. (1991) (which demonstrated some similarities of the Neptune's polar cusp region to the earth's cusp), but uses a different approach requiring plasma and vector magnetic field quantities. In addition, various MHD properties of the cusp-magnetopause boundary, which separates the cusp from the magnetosheath allowing thermal anisotropy, are obtained, including the magnetopause (MP) normal, mass, and normal momentum flux, the boundary speed (and thickness), and their relationships. Results demonstrate that the MP velocity is composed of two components: a propagation speed and the other component consistent with the rotational motion of the magnetosphere.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 97; A6, J
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  • 3
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    Interaction of the solar wind with the moon (1969)
    In:  CASI
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    Publikationsdatum: 2005-11-17
    Beschreibung: Solar wind interaction with lunar far side and near side surface, and lunar magnetic fields from Explorer 35 data
    Schlagwort(e): SPACE RADIATION
    Materialart: NIFICANT ACCOMPLISHMENTS IN SCI., 1968 1969; P 121-126
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  • 4
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    Magnetic fields - Reasons for simulation and methods available (1964)
    In:  CASI
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    Publikationsdatum: 2006-10-26
    Beschreibung: Simulation of wear magnetic fields observed in magnetosphere, turbulent boundary layer, and interplanetary medium regions of space
    Schlagwort(e): SPACE RADIATION
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  • 5
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    The magnetosphere and its boundary layer (1965)
    In:  CASI
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    Publikationsdatum: 2006-10-26
    Beschreibung: Magnetosphere and boundary layer measurements by IMP-I satellite - solar wind, cosmic ray, and geomagnetic field
    Schlagwort(e): SPACE RADIATION
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  • 6
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    A probable observation of the wake of the moon (1966)
    In:  CASI
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    Publikationsdatum: 2006-10-26
    Beschreibung: IMP observation of probable lunar magnetohydrodynamic wake
    Schlagwort(e): SPACE RADIATION
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  • 7
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    Magnetostrophic balance in planetary dynamos - Predictions for Neptune's magnetosphere (1986)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: With the purpose of estimating Neptune's magnetic field and its implications for nonthermal Neptune radio emissions, a new scaling law for planetary magnetic fields was developed in terms of externally observable parameters (the planet's mean density, radius, mass, rotation rate, and internal heat source luminosity). From a comparison of theory and observations by Voyager it was concluded that planetary dynamos are two-state systems with either zero intrinsic magnetic field (for planets with low internal heat source) or (for planets with the internal heat source sufficiently strong to drive convection) a magnetic field near the upper bound determined from magnetostrophic balance. It is noted that mass loading of the Neptune magnetosphere by Triton may play an important role in the generation of nonthermal radio emissions.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 91; 11003-11
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  • 8
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    The magnetic field of Mercury. I (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An updated analysis and interpretation are presented of the magnetic field observations obtained during the Mariner 10 encounter with the planet Mercury on March 29, 1974. The combination of data relating to position of the detached bow shock wave and magnetopause and the geometry and magnitude of the magnetic field within the magnetosphere-like region surrounding Mercury lead to the conclusion that an internal planetary field exists with dipole moment approximately 5.1 times 10 to the 22nd G per cu cm. The dipole axis has a polarity sense similar to that of earth and is tilted 7 deg from the normal to Mercury's orbital plane. The magnetic field observations reveal a significant distortion of the modest Hermean field by the solar wind flow and the formation of a magnetic tail and neutral sheet which begins close to the planet on the night side. Presently, an active dynamo mechanism in the planetary interior appears to be favored in the interpretation of the field origin.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research; 80; July 1
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  • 9
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    Magnetic field of Mercury confirmed (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Observations made by Mariner 10 during its third encounter with Mercury (Mercury III) are presented which confirm the tentative conclusion drawn from the first encounter (Mercury I) that Mercury has a modest intrinsic magnetic field. Some comparison between Mercury I and III data and trajectories is attempted, and the superior affirmative nature of Mercury III is pointed out. Definitive bow shock and magnetopause detections of solar wind deflection were made during both passes.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Nature; 255; May 15
    Format: text
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  • 10
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    Cosmic ray modulation - Voyager 2 observations, 1987-1988 (1991)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: The intensity profile of cosmic rays above 70 MeV observed by Voyager 2 and its relation to the interplanetary magnetic field and plasma at the beginning of the new modulation cycle from day 190, 1987 to day 345, 1988 in the region from 23.3 AU to 27.8 AU is analyzed. The cosmic ray intensity profile was approximately a series of four plateaus separated by three steps in which the intensity dropped abruptly. Each step was associated with a region in which the magnetic field, density and temperature were higher than average. The plateaus were associated with regions in which the magnetic field was alternately strong and weak. The solar wind within 200 AU during this interval can be roughly pictured as consisting of three shells between which the flow was quasiperiodic with a 26 day periodicity. The latitudinal extent of the shells in the northern hemisphere was probably less than 33 deg, since no steps were observed by Voyager 1. Drift motions might play a role during the recovery phase, just prior to the onset of the new modulation cycle, in the plateau regions between the shells, within the shells where drifts in various directions might mimic diffusion, and close to 1 AU, where large regions of intense magnetic fields have not yet formed. However the principal decreases in the cosmic ray intensity in the outer heliosphere during 1987 and 1988 were associated with the passage of broad regions of intense magnetic fields, consistent with the diffusion/convection model.
    Schlagwort(e): SPACE RADIATION
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 96; 3789-379
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