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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • CHEMISTRY AND MATERIALS (GENERAL)  (1)
  • 1
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    Lunar magnetic permeability studies and magnetometer sensitivity (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A regression of quiet magnetic field components simultaneously measured by the two Explorer 35 magnetometers reveals uncertainties in effective sensitivity factors of up to a few percent in one or both of these instruments. Given this, the validity of previous lunar permeability studies based on Explorer 35/ALSEP regressions, wherein inferences are drawn from regression line slopes differing from unity by the order of one percent, is called into question. We emphasize the need to critically address the question of small deviations in magnetometer sensitivity factors from nominal values as a part of any two-magnetometer lunar permeability study.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 4; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Trapped particle flux models at NSSDC/WDC-A-R/S (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The data needed in the future for trapped particle modeling are summarized. A short summary of past and future modeling activities and a list of satellite data that have not yet been considered in the modeling efforts is included.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA, Langley Research Center, NASA(SDIO Space Environmental Effects on Materials Workshop, Part 2; p 569-572
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A survey of long term interplanetary magnetic field variations (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Interplanetary magnetic field data from 10 IMP, AIMP, and HEOS spacecraft were merged into a composite data set spanning 1963 to 1974. A consideration of the mutual consistency of the individual data sets reveals agreement typically to within 0.2 gamma. Composite data set analysis reveals: (1) whereas the yearly averaged magnitudes of all field vectors show virtually no solar cycle variation, the yearly averaged magnitudes of positive- and negative-polarity field vectors show separate solar cycle variations, consistent with variations in the average azimuthal angles of positive- and negative-polarity field vectors, (2) there is no heliolatitude dependence of long time average field magnitudes, (3) field vectors parallel to the earth-sun line are on the average 1 gamma less in magnitude than field vectors perpendicular to this line, and (4) the heliolatitude-dependent dominant polarity effect exhibits a complex sign reversal in the 1968 to 1971 period and a measure of symmetry in 1972 to 1974 not found in earlier data.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-70902 , X-601-75-136
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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