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  • LUNAR AND PLANETARY EXPLORATION  (33)
  • GEOPHYSICS  (5)
  • Geophysics
  • 1980-1984  (38)
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  • 1
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    Saturn as a radio source (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Magnetospheric radio emissions, Saturn electrostatic discharges, inferred source locations, and emission theories are addressed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 2
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    Chorus-related electrostatic bursts at Jupiter and Saturn (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Analyses of the wideband plasma wave data obtained by Voyagers 1 and 2 at Jupiter and Saturn have revealed electrostatic bursts similar to those recently discovered at earth in association with whistler-mode chorus. In all three magnetospheres the bursts are characterized by sporadic emissions near or slightly below the electron plasma frequency with bandwidths ranging from 10 percent to more than 50 percent of the center frequency. The events found at Jupiter occur in the middle magnetosphere during both the dayside as well as the early morning passes. At Saturn, the bursts occurred in the outer regions of the magnetosphere during the dayside pass. In each of the events analyzed, evidence exists for modulation of the electrostatic bursts by a low frequency wave, presumably chorus. One of the observations gained at Jupiter includes the detection of a low-frequency band at the proper frequency for chorus. Detailed waveform analysis confirms that this band does, indeed, modulate the electrostatic bursts. Based on the present understanding of the terrestrial observations it is believed that the electrostatic bursts are generated by an electron beam trapped in Landau resonance with the chorus. Previously announced in STAR as N83-37042
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A138336 , Journal of Geophysical Research (ISSN 0148-0227); 89; 75-83
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    NASA TECHNICAL REPORTS
  • 3
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    A search for Saturn electrostatic discharges in the Voyager plasma wave data (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A search of Voyager spacecraft plasma wave data for evidence of Saturn electrostatic discharges, whose detection was suggested to be likely on the basis of radio astronomy observations, has yielded no evidence of this phenomenon. The statistical significance of this null result is analyzed, and its ramifications are commented upon. The explanations entertained for the lack of plasma wave observations of electrostatic discharges include the possibility that many events are of much shorter duration than previously reported, or that there may be a nonlinear distortion in the radio astronomy receiver employed which may have artificially broadened the spectrum of the discharges.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 4
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    Terrestrial versus Jovian VLF chorus - A comparative study (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The relevant parameters of the magnetospheres of Jupiter and earth are investigated based on the wave-particle resonant interactions that are believed to be responsible for the generation of VLF chorus emissions observed on Voyager 1. Expressions are derived for the wave-particle interaction length and the nonlinearity parameter, and the values of these parameters are compared with those calculated for the earth's magnetosphere. It is determined that the typical interaction lengths are at least 2-5 times larger in the Jovian than in the terrestrial magnetosphere, and that the wave intensity necessary to reach the threshold of nonlinearity in the Jovian magnetosphere is 5-100 times lower. Measurements by Voyager 1 show that the inferred wave magnetic field intensities of the Jovian chorus are in the range of reported intensities for terrestrial chorus, probably due to the fact that the fluxes of few keV resonant particles found in the Jovian magnetosphere were typically two orders of magnitude higher. Growth rate measurements on Voyager 1 broadband wave data are employed to confirm that the temporal growth rates of Jovian chorus bursts are higher than for the earth.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Aug. 1
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  • 5
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    Narrowband electromagnetic emissions from Jupiter's magnetosphere (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Recent studies of wideband plasma wave data from Voyagers 1 and 2 have revealed the existence of narrowband radio emissions escaping from Jupiter's magnetosphere in the frequency range 1-12 kHz. These narrowband emissions are very similar to narrowband emissions previously discovered near earth and Saturn, and are believed to be produced by mode conversion from locally generated upper hybrid resonance waves at odd half-integral harmonics of the electron cyclotron frequency. This mode conversion process is believed to be one of the basic mechanisms for generating planetary radio emissions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 302; March 31
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  • 6
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    Observations of Jupiter's distant magnetotail and wake (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results are presented for Voyager 2 plasma wave and plasma measurements, obtained during mid-1980 to August 1981, which indicate the existence of clear signatures of Jovian nonthermal continuum radiation while the spacecraft was in the general downstream direction from Jupiter up to distances of approximately 4.5 AU. A periodicity indicating some solar wind control was indicated by the increasing magnitude and duration of the events as Voyager 2 approached the nominal aberrated tail position in the spring of 1981. It is found that each event shows characteristics suggestive of electromagnetic radiation trapped within a low-density cavity. Several of the events are characterized by a broad, moderately low density region surrounding a well-defined, very low density core. It is concluded that this series of continuum radiation events is best interpreted as the passage of Voyager 2 through the extended magnototail and wake of Jupiter. In addition, the various allowed tail configurations consistent with the observations are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A123812 , Journal of Geophysical Research; 87; Dec. 1
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  • 7
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    Plasma waves near Saturn: Initial results from Voyager 1 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Voyager 1 encounter with Saturn provided the first opportunity to investigate plasma wave interactions in the magnetosphere of Saturn. An overview of the principal results from the Voyager 1 plasma wave instrument is presented starting with the initial detection of Saturn and ending about four weeks after closest approach. A survey plot of the electric field intensities detected during the Saturn encounter is shown starting shortly before the inbound shock crossing and ending shortly after the outbound magnetopause crossing. Many intense waves were observed in the vicinity of Saturn. To provide a framework for presenting the observations, the results are discussed more or less according to the sequence in which the data were obtained.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-163966 , U-OF-IOWA-81-3
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  • 8
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    Plasma wave turbulence at planetary bow shocks (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Voyager 1 observations of plasma wave turbulence at Saturn's bow shock are discussed and compared with corresponding data from Jupiter, earth, and Venus. The results suggest that the plasma instabilities that develop at the lower Mach number bow shocks of the terrestrial planets differ from those found at the high Mach number bow shocks of the outer planets.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 292; Aug. 20
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  • 9
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    Control of Saturn's kilometric radiation by Dione (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Voyager 1 observations of Saturn's kilometric radio emissions reveal a strong but apparently transitory control by the orbital phase angle of Dione. This may be a geometrical effect and a time-variable plasma torus associated with Dione could explain most of the observed details of the Dione modulation by creating a shadow zone near the equatorial plane.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AD-A104533 , Nature; 292; Aug. 20
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  • 10
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    Narrowband electromagnetic emissions from Saturn's magnetosphere (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A series of narrowband electromagnetic emissions were detected by the plasma wave instrument on board Voyager 1 coming from the inner region of Saturn's magnetosphere in the frequency range 3-30 kHz. These emissions have many similarities to continuum radiation detected in the earth's magnetosphere and narrowband kilometric radiation in the Jovian magnetosphere. The observed frequency spacing suggests that the emissions are being generated near Tethys, Dione and Rhea, probably in regions of large plasma density gradients associated with boundaries of the plasma sheet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 292; Aug. 20
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