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  • 1
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    Plasma wave turbulence around the shuttle - Results from the Spacelab-2 flight (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: During the Spacelab-2 flight, which occurred from July 29, to August 6, 1985, a spacecraft called the Plasma Diagnostics Package (PDP) was released from the shuttle to explore the plasma environment around the shuttle. The plasma wave instrument on the PDP detected a region of intense broadband turbulence around the shuttle at frequencies extending from a few Hz to about 10 kHz. The noise has broadband intensities ranging from 1 to 5 mV/m and was observed at distances of up to 400 m from the shuttle. The highest intensities occurred in the region downstream of the shuttle and along magnetic field lines passing near the shuttle. The intensities also tended to increase during periods of high thruster activity, which provides strong evidence that the noise is caused by an interaction of the ionosphere with gaseous emissions from the shuttle, similar in many respects to the interaction of a comet with the solar wind. Antenna interference patterns observed in the wideband data show that the wavelength of the turbulence is very short, a few meters or less.
    Keywords: PLASMA PHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 15; 760-763
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Exposed high-voltage source effect on the potential of an ionospheric satellite (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A pulsed, high-voltage source, which is able to draw a current from the surrounding plasma, is seen to induce large changes in the potential of an ionospheric satellite (the Iowa Plasma Diagnostics Package flown on Space Shuttle flight STS-51F). This, in turn, may affect the operation of other instruments that use the chassis of the satellite as a ground for electrical circuits. The magnitude of the change in satellite potential is dependent upon both the orientation of the high-voltage source, relative to the plasma flow, and the characteristics of the high-voltage source. When the satellite is grounded to the Shuttle Orbiter, this effect is sufficient to change the potential of the Orbiter by a small, but noticeable, amount.
    Keywords: PLASMA PHYSICS
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 25; 64-69
    Format: text
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    NASA TECHNICAL REPORTS
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