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  • GEOPHYSICS  (65)
  • LUNAR AND PLANETARY EXPLORATION  (24)
  • SPACE SCIENCES  (4)
  • 1
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    Possibility of detecting magnetospheric radio bursts from Uranus and Neptune (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The intensity of magnetospheric radio bursts (MRBs) is scaled to solar-wind input into planetary magnetospheres and the frequency of emission is scaled to polar surface magnetic-field strength in order to estimate the possibility of detecting MRBs from Uranus and Neptune. A scaling law is derived which relates the ratio of power radiated in MRBs to the solar-wind input for earth, Jupiter, and Saturn. Power-flux spectra of MRBs from these three planets are plotted, and it is shown that Jupiter and Saturn may radiate 1% to 5% of the solar-wind energy input into their magnetospheres. The properties of MRBs from Uranus and Neptune are estimated by assuming a conversion efficiency of 1% to 5%, a bandwidth of half the peak frequency, and conformity of Uranus' and Neptune's dipole moments with the magnetic Bode's law. Based on the results, it is suggested that detection of MRBs from these two planets may be a reasonable cruise-mode radio-astronomy objective on future missions to the outer solar system.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 261; May 27
    Format: text
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  • 2
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    Jupiter and Io - A binary magnetosphere (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A qualitative assessment is presented of Voyager 1 and 2 data analysis and theoretical interpretation, regarding the Io torus and Jovian aurora, dominant magnetospheric components, plasma waves and radio emissions, with emphasis on the difficulty of accounting for either the Jupiter aurora or Io torus EUV emission luminosities in energetic terms. Jupiter's middle atmosphere is also considered, with attention to observations of corotating ions, their ambiguities and their implications. After a discussion of the question of Jupiter's interaction with the solar wind, as manifested by its magnetic tail, terrestrial magnetospherics are invoked in the construction of a tentative unification of observed phenomena which is within the latitude afforded by the current state of data reduction.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Vistas in Astronomy; 25; pt. 3
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  • 3
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    Unstable growth of unducted whistlers propagating at an angle to the geomagnetic field (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Unstable growth rate of unducted whistler waves propagating at angle to geomagnetic field
    Keywords: GEOPHYSICS
    Type: NASA-CR-77341 , AVCO-EVERETT RES. REPT.-244
    Format: application/pdf
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  • 4
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    Estimation and comparison of quasilinear electron heating in the shock foot at Jupiter and earth (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A simple quasilinear model is developed to estimate the electron heating that occurs in the foot of a supercritical, quasiperpendicular shock through interactions with electrostatic waves generated by reflected ions. At earth the increase in electron thermal energy calculated using the measured wave amplitudes is negligible, while at Jupiter it is comparable with the observed temperature gain across the shock. The anisotropic quasilinear heating should destabilize whistler mode waves in the foot. These have been detected by the plasma wave instrument on Voyager with amplitudes sufficient to isotropize the electron distribution.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 12; 609-612
    Format: text
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  • 5
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    Plasma wave spectra near slow mode shocks in the distant magnetotail (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Recently Feldman et al. (1984) used ISEE-3 data to analyze variations in charged particle and magnetic field characteristics near plasma sheet boundaries in the distant magnetotail, and they demonstrated that several of the crossings had the properties of slow mode shocks. ISEE-3 plasma wave measurements at two of these crossings are presently discussed, and it is shown that all conventional characteristics of fast collisionless shock spectra are present. Upstream (lobe side) electron plasma oscillations are detected in association with electron heat flux enhancements, and pronounced spectral peaks at lower frequencies are found within the shock layer.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1050-105
    Format: text
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  • 6
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    Plasma rest frame distributions of suprathermal ions in the earth's foreshock region (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper presents rest frame ion distributions computed from three-dimensional observations of upstream suprathermal ions made by the University of Iowa Quadrispherical Lepedea on ISEE-1. The observations are for a single inbound midmorning pass starting upstream from the ion foreshock and continuing across the quasi-spherical bow shock into the magnetosheath. The crossing of the ion foreshock boundary is marked by a several-minute burst of ions of temperature 100-200 eV moving along the IMF away from the bow shock at 500 km/s relative to the solar wind. The observation of these reflected ions is followed by an extended interval of diffuse ions of temperatures 2-3 keV flowing at about 250 km/s relative to the solar wind and persisting until the bow shock is crossed. Both types of suprathermal ions constitute roughly 2% of the total ion density and carry a parallel heat flux of 0.01 ergs/sq cm-s.
    Keywords: GEOPHYSICS
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  • 7
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    Global magnetohydrodynamic simulation of the two-dimensional magnetosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The time-dependent magnetohydrodynamic interaction of the solar wind with a two-dimensional dipole magnetic field has been simulated using a novel Lagrangian particle type of MHD code that can treat local low density or vacuum regions without numerical instability. This enables one to simulate the time-dependent magnetic tail. When the solar wind field is southward, a magnetic field line topology consistent with Dungey's model emerges in steady state. The tail, however, is short, and the x-points are only slightly shifted from their vacuum locations, because of strong numerical resistivity. Different configurations resulting from different relative orientations of the solar wind magnetic field and dipole axis are also presented. While the magnetic field is relatively steady, the density and flow in the magnetosheath are turbulent, as are the bow shock and magnetopause; the Kelvin-Helmholtz instability may account for these phenomena. We also model a 'substorm' as the passage of a rotational discontinuity in the solar wind over the dipole. Both 90 and 180 deg shifts to a southward solar wind field cause a violent readjustment of the magnetic tail which eventually settles down to the Dungey configuration.
    Keywords: GEOPHYSICS
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  • 8
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    A parametric study of electron multiharmonic instabilities in the magnetosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This paper presents numerical calculations of spatial growth rates of multiharmonic electron-cyclotron instabilities driven by a loss-cone energetic distribution, in the presence of colder electrons. When the cold electron density is comparable to the hot, nonconvective instability is possible in harmonic bands below or including the cold upper-hybrid frequency. When the cold electron density is larger than the hot, nonconvective instability is possible only in that band containing the cold upper-hybrid frequency. Increasing the cold electron temperature in relation to the hot eventually removes all nonconvective behavior. Convective instability is still possible above the cold upper-hybrid frequency.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Nov. 1
    Format: text
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  • 9
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    Detection of Jovian whistler mode chorus - Implications for the Io torus aurora (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Near the Io torus outer boundary (L of about 8), the Voyager 1 plasma wave instrument detected high frequency (f) waves near one-half the electron cyclotron frequency fc. High resolution waveform measurements demonstrate that these signals (f approximately equal to fc/2) are banded whistler mode chorus at f not greater than fc/2 and half-cyclotron frequency emissions with f slightly above fc/2. The density (about 2.5 per cu cm), the energy (a few keV), and the omnidirectional energy flux (100 ergs/sq cm-sec), of the electrons resonant with the chorus were determined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 7; Jan. 198
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  • 10
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    Escape of heated ions upstream of quasi-parallel shocks (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A simple theoretical criterion by which quasi-parallel and quasi-perpendicular collisionless shocks may be distinguished is proposed on the basis of an investigation of the free escape of ions from the post-shock plasma into the region upstream of a fast collisionless shock. It was determined that the accessibility of downstream ions to the upstream region depends on upstream magnetic field shock normal angle, in addition to the upstream plasma parameters, with post-shock ions escaping upstream for shock normal angles of less than 45 deg, in agreement with the observed transition between quasi-parallel and quasi-perpendicular shock structure. Upstream ion distribution functions resembling those of observed intermediate ions and beams are also calculated.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 9; May 1982
    Format: text
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