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  • GEOPHYSICS  (3)
  • Lunar and Planetary Science and Exploration  (3)
  • 1995-1999  (3)
  • 1985-1989  (3)
  • 1
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    Enhanced Whistler-Mode Emissions: Signatures of Interchange Motion in the Io Tourus (1997)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: During the Galileo inbound pass through the Io torus the plasma wave insturment detected intervals of enhanced whistler-mode emissions.
    Keywords: Lunar and Planetary Science and Exploration
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    NASA TECHNICAL REPORTS
  • 2
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    Effectiveness of Near-Grazing Incidence Reflection in Creating the Rotationally Modulated Lanes in the Jovian Hectometric Radio Emission Spectrum (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Galileo plasma wave instrument has identified a narrow (in frequency) attenuation band in the hectometric emission that varies in frequency with system 3 longitude. It is possible to model this emission band assuming a high-latitude cyclotron source region with emission that is efficiently attenuated when the ray path is nearly tangent to an L shell that is close to the Io flux tube. The data suggest that the mechanism for attenuating the emission is very efficient, with the ratio of attenuated to unattenuated emission I/I(sub o) 〈 0.02, and not a strong function of frequency. In this paper we demonstrate that incoherent scattering alone cannot explain the attenuation lane, which does not preclude coherent scattering by uncertain processes. We find rather that the source of attenuation is consistent with near-grazing incidence reflection of emission from an L shell that is near the Io flux tube (a caustic surface).
    Keywords: Lunar and Planetary Science and Exploration
    Type: Paper-1999RS900036 , Radio Science (ISSN 0048-6604); 34; 4; 1005-1012
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    NASA TECHNICAL REPORTS
  • 3
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    Electron velocity distributions and plasma waves associated with the injection of an electron beam into the ionosphere (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An electron beam was injected into earth's ionosphere on August 1, 1985, during the flight of the Space Shuttle Challenger as part of the objectives of the Spacelab 2 mission. In the wake of the Space Shuttle a magnetically aligned sheet of electrons returning from the direction of propagation of the beam was detected with the free-flying Plasma Diagnostics Package. The thickness of this sheet of returning electrons was about 20 m. Large intensifications of broadband electrostatic noise were also observed within this sheet of electrons. A numerical simulation of the interaction of the electron beam with the ambient ionospheric plasmas is employed to show that the electron beam excites electron plasma oscillations and that it is possible for the ion acoustic instability to provide a returning flux of hot electrons by means of quasi-linear diffusion.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 6995-700
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    NASA TECHNICAL REPORTS
  • 4
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    Measurements of plasma parameters in the vicinity of the Space Shuttle (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A Langmuir probe flown as part of the Plasma Diagnostics Package aboard the third Space Shuttle flight was used to determine electron densities, temperatures, and plasma potential in the vicinity of the Shuttle Orbiter. Measurements taken both in the cargo bay and 10 m above the cargo bay on the Remote Manipulator System arm are consistent with small satellite and laboratory results, in that reduced densities and elevated temperatures are observed in the Shuttle wake. The primary difference in the Shuttle measurements is one of magnitude; i.e., orders-of-magnitude density decreases and factor-of-five temperature enhancements. Analysis of data taken in (Delta N)/N turbulence can be as high as a few percent, and the most intense turbulence seems to occur near regions with a steep gradient in plasma pressure.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 34; 993-1004
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    NASA TECHNICAL REPORTS
  • 5
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    Effects of chemical releases by the STS 3 orbiter on the ionosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The Plasma Diagnostics Package, flown aboard STS-3 as part of the first Shuttle payload (OSS-1), recorded the effects of various chemical releases from the Orbiter. Changes in the plasma environment was observed during flash evaporator system releases, water dumps and maneuvering thruster operations. During flash evaporator operations, broadband Orbiter-generated electrostatic noise was enhanced and plasma density irregularities were observed to increase by 3 to 30 times with a spectrum which rose steeply and peaked below 6 Hz. In the case of water dumps, background electrostatic noise was enhanced at frequencies below about 3 kHz and suppressed at frequencies above 2 kHz. Thruster activity also stimulated electrostatic noise with a spectrum which peaked at approximately 0.5 kHz. In addition, ions with energies up to 1 keV were seen during some thruster events.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 3487-349
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  • 6
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    Cassini and Wind Stereoscopic Observations of Jovian Non-Thermal Radio Emissions (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: During two intervals in 1999, simultaneous observations of Jupiter's decametric and hectometric radio emissions were made with the Cassini radio and plasma wave instrument (RPWS) and the radio and plasma wave instrument (WAVES) on the Wind spacecraft in Earth orbit. During January, the Jovian longitude difference between the two spacecraft was about 5 deg, whereas for the August-September Earth flyby of Cassini, the angle ranged from 0 deg to about 2.5 deg. With these separations, the instantaneous widths of the walls of the hollow conical radiation beams of some of the decametric arcs were measured suggesting that the typical width is approximately 2 deg. The conical beams seem to move at Io's revolution rate rather than with Jupiter's rotation rate. Additionally, some of the non-arc emissions have very narrow and quite peculiar beamwidths.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Journal of Geophysical Research
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