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  • 1
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    Ultralow frequency waves in the magnetotails of the earth and the outer planets (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Ultralow frequency waves with periods greater than two minutes are characteristic features of planetary magnetotails. At Jupiter, changes in the wave characteristics across the boundary between the plasma sheet and the lobe have been used to identify this important plasma boundary. In the terrestrial lobes the wave amplitude can be relatively large, especially during intervals of intense geomagnetic activity. The wave power seen in the lobes of the magnetotails of the earth, Jupiter, Saturn and Uranus is evaluated to evaluate a proposal by Smith et al. that the propagating waves generated by the Kelvin-Helmholtz instability on the magnetopause can heat the plasma through a resonant absorption of these waves. The results indicate that the wave power in the lobes is generally small and can be easily understood in the framework of coupled MHD waves generated in the plasma sheet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 12; 8 Au
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  • 2
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    Phase space densities in the Uranian plasma sheet (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Based on its ionic composition, the magnetosphere of Uranus appears to contain little plasma of solar wind origin. If the plasma source is the atmosphere of the planet, both adiabatic convection with uniform losses and radial diffusion would imply negative radial gradients of the distribution function at fixed first and second adiabatic invariants. The analysis of LECP data in the outer magnetosphere reveals different gradients. Evidence is presented that ions may have been non-adiabaticaly heated during the fourth plasma sheet immersion although this is not unambiguously distinguishable from a source at large down tail distance.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Advances in Space Research (ISSN 0273-1177); 12; 8 Au
    Format: text
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  • 3
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    Magnetic field studies of the solar wind interaction with Venus from the Galileo flyby (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: During the February 10, 1990 flyby of Venus, the Galileo spacecraft skimmed the downnstream flank of the planetary bow shock. This provided an opportunity to examine both the global and the local structure of the shock in an interval during which conditions in the solar wind plasma were quite steady. The data show that the cross section of the shock in planes transverse to the flow is smaller in directions aligned with the projection of the interplanetary magnetic field than in directions not so aligned. Ultralow-frequency waves were present in the unshocked solar wind, and their amplitude peaked when the spacecraft was downstream of the foreshock. At large distances down the tail, the Mach number of the flow normal to the shock is low, thus providing the opportunity to study repeated crossings of the collisionless shock in an interesting parameter regime. Some of the shock crossings reveal structure that comes close to the theoretically predicted form of intermediate shocks, whose existence in collisionless plasmas has not been confirmed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 253; 1518-152
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  • 4
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    A pincer-shaped plasma sheet at Uranus (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: An MHD simulation of the terrestrial magnetosphere, rescaled to represent the Uranian magnetotail, is carried out. The 3p immersion can be explained in terms of possible extreme departures from average plasma sheet shapes in the Uranian magnetosphere. The orientation of the Uranian dipole and rotation axes produce a dynamically curved plasma sheet which is an unusual feature of the Uranian magnetosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 14987-14
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  • 5
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    The Jovian Aurora - Electron or ion precipitation? (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: High signal-to-noise spectra of the Jovian aurora obtained at 1200 to 1500 A by the IUE Observatory were examined for the existence of sulfur and oxygen emissions that would be expected if the UV emissions were produced by precipitating heavy ions. The results of these measurements and subsequent spectral modeling, using a model of heavy aurora constructed by Horanyi et al. (1988), showed mixed evidence of the oxygen and sulfur emissions. It was noted that only the UV emissions which are produced above the UV absorbing hydrocarbon layer were observed by the IUE and Voyager UV spectrometers. This fact, combined with the recent observations of the longitudinal distribution of the Jovian UV aurora, indicates that electrons as well as ions play a role in Jovian auroral processes. Based on the observations, it is suggested that heavy-ion auroral energy deposition is concentrated at altitudes below the homopause, while electrons with energies of 10 to 30 keV are responsible for the bulk of the observable UV and EUV emissions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 7244-725
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