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  • SPACECRAFT INSTRUMENTATION  (2)
  • LUNAR AND PLANETARY EXPLORATION  (1)
  • 1
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    The Medium-energy particle analyzer (MEPA) on the AMPTE CCE spacecraft (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A major objective in the design of the Charge Composition Explorer (CCE) is related to the measurement of small fluxes of ions (lithium and barium) injected in the solar wind and the deep magnetotail. A second important objective is concerned with the comprehensive measurement of the composition and dynamics of the natural-particle population. The medium-energy particle analyzer (MEPA) in the CCE is designed to cover an energy range which is normally covered by electrostatic analyzers. In order to prevent saturation by the large magnetospheric fluxes of low-energy protons, the MEPA sensor was designed to have a low efficiency for protons, but a high efficiency for the rarer heavier nuclei. The considered aims could be achieved by developing a technology, new to space flight, for measuring energetic ion composition. Particle mass is determined on the basis of the measurement of particle time of flight and total energy.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-23; 230-233
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    NASA TECHNICAL REPORTS
  • 2
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    The Galileo Energetic Particles Detector (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Amongst its complement of particles and fields instruments, the Galileo spacecraft carries an Energetic Particles Detector (EPD) designed to measure the characteristics of particle populations important in determining the size, shape, and dynamics of the Jovian magnetosphere. To do this the EPD provides 4pi angular coverage and spectral measurements for Z greater than or equal to 1 ions from 20 keV to 55 MeV, for electrons from 15 keV to greater than 11 MeV, and for the elemental species helium through iron from approximately 10 keV/nucl to 15 MeV/nucl. Two bidirectional telescopes, mounted on a stepping platform, employ magnetic deflection, energy loss versus energy, and time-of-flight techniques to provide 64 rate channels and pulse height analysis of priority selected events. The EPD data system provides a large number of possible operational modes from which a small number will be selected to optimize data collection during the many encounter and cruise phases of the mission. The EPD employs a number of safeing algorithms that are to be used in the event that its self-checking procedures indicate a problem. The instrument and its operation are described.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Space Science Reviews (ISSN 0038-6308); 60; 4-Jan; 385-412
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Energetic particles at Venus - Galileo results (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: At Venus the Energetic Particles Detector (EPD) on the Galileo spacecraft measured the differential energy spectra and angular distributions of ions above about 22 keV and electrons above about 15 keV in energy. The only time particles were observed by EPD was in a series of episodic events near closest approach (0559:03 UT). Angular distributions were highly anisotropic, ordered by the magnetic field, and showed ions arriving from the hemisphere containing Venus and its bow shock. The spectra showed a power law form with intensities observed into the 120- to 280-keV range. Comparisons with model bow shock calculations show that these energetic ions are associated with the Venusian foreshock-bow shock region. Shock-drift acceleration in the Venusian bow shock seems the most likely process responsible for the observed ions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 253; 1525-152
    Format: text
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    NASA TECHNICAL REPORTS
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