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  • PHYSICS, PLASMA  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
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  • 1
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    POLAR 5 - An electron accelerator experiment within an aurora. III - Evidence for significant spacecraft charging by an electron accelerator at ionospheric altitudes (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The POLAR 5 rocket experiment carried an electron accelerator on a 'daughter' payload which injected a 0.1 A beam of 10 keV electrons in a pulsed mode every 410 ms. With spin and precession, injections were made over a wide range of pitch angles. Measurements from a double probe electric field instrument and from particle detectors on the 'mother' payload and from a crude RPA on the 'daughter' payload are interpreted to indicate that the 'daughter' charges to a potential between several hundred volts and 1 kV. The neutralizing return current to the 'daughter' is shown to be asymmetrically distributed with the majority being collected from the direction of the beam. The additional electrons necessary to neutralize the daughter are thought to be produced and heated through beam-plasma interactions postulated by Maehlum et al. (1980) and Grandal et al. (1980) to explain the particle and optical measurements. Significant electric fields emanating from the charged 'daughter' and the beam are seen at distances exceeding 100 m at the 'mother' payload.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Planetary and Space Science; 28; Mar. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Isolated cold plasma regions: Observations and their relation to possible production mechanisms (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Regions of enhanced cold plasma, isolated from the main plasmasphere along the Explorer 45 orbit on the equatorial plane, are reported using the sheath induced potentials seen by the electric field experiment. The occurrence of these regions has a strong correlation with negative enhancements of Dst, and their locations are primarily in the noon-dusk quadrant. The data support the concept that changes in large scale convection play a dominant role in the formation of these regions. Plasmatails that are predicted from enhancements of large scale convection electric fields in general define where these regions may be found. More localized processes are necessary to account for the exact configuration and structure seen in these regions and may eventually result in detachment from the main plasmasphere.
    Keywords: PHYSICS, PLASMA
    Type: NASA-TM-X-70686 , X-625-74-196
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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