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  • Other Sources  (5)
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  • 1
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    POGO observations of the equatorial electrojet (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: During intervals in 1967 to 1970, the OGO-4 and 6 spacecraft made over 2000 traversals over the equatorial electrojet in the altitude range 400-800 km when local times were between 9 and 15 hours. These spacecraft carried total field magnetometers making measurements to an accuracy of 2 gamma with a sample rate greater than once a second. Delta F values, the deviations from these observations, were formed from an internal reference model. The results were plotted for a 30 deg band about the equator, and the characteristics of the electrojet effect in the data were investigated. This effect was characterized by a sharp negative V-signature of some 16-19 deg in width and a variable amplitude. The position of this minimum was found to lie within 0.5 deg of the dip equator. A slight northward shift was noted at the longitude of Huancayo. The jet amplitudes were normalized to 400 km amplitudes and observed to be highly variable in time. Amplitudes over the longitude range 50 to 90 deg W averaged 60% higher than elsewhere, as expected, due to the weaker main field. However, though the scatter of amplitudes is high, the expected minima in east Asia was not evident. It was speculated that this could be due to a less conducting upper mantle in this area.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65995 , X-645-72-299 , NSSDC-ID-67-073A-06-PM , NSSDC-ID-69-051A-21-PM
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    The equatorial electrojet satellite and surface comparison (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The OGO 4 and 6 (POGO) magnetic field results for the equatorial electrojet indicate that while the present models are approximately correct, the possibility of a westward component must be incorporated. The scatter diagrams of POGO amplitudes and surface data show a correlation. The ratios between the amplitudes estimated from surface data and those at 400 km altitude are as follows: India 5 to 8, East Africa (Addis Ababa) 4, Central Africa 3, West Africa (Nigeria) 3, South America (Huancayo) 5, and Philippines 5. The variation in the ratio is due to the conductivity structure of the earth in various zones.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-66218 , X-645-73-5 , NSSDC-ID-67-073A-06-OM , NSSDC-ID-69-051A-21-OM , Intern. Symp. on Equatorial Aeronomy; Dec 01, 1972; Greenbelt, Md; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    The POGO data. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: During intervals in 1967-1970, the OGO-4 and 6 spacecraft made over 2000 traversals over the equatorial electrojet in the altitude range 400-800 km when local times were between 9 and 15 hr. These spacecraft carried total field magnetometers making measurements to an accuracy of 2 gammas with a sample rate greater than once a second. Delta-F values, the deviations of these observations from an internal reference model, were plotted for a 30 deg band about the Equator, and the characteristics of the electrojet effect in the data were investigated. This effect was characterized by a sharp negative V-signature of some 16-19 deg in width and a variable amplitude.
    Keywords: GEOPHYSICS
    Type: NSSDC-ID-67-073A-06-PM , NSSDC-ID-69-051A-21-PM
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Asymmetric ring current at twilight local time (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: OGO-2 rubidium vapor magnetometer measurements comparison with surface magnetic observatory data during geomagnetic storms, considering asymmetric ring current
    Keywords: GEOPHYSICS
    Type: NSSDC-ID-65-081A-05-PM , ; ADEMIE DES SCIENCES
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    NASA TECHNICAL REPORTS
  • 5
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    Magnetic field mapping of the inner magnetosphere (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Inner magnetosphere magnetic field mapping, deriving Pogo model
    Keywords: GEOPHYSICS
    Type: NSSDC-ID-65-081A-05-PM , NSSDC-ID-67-073A-06-PM , NSSDC-ID-69-051A-21-PM , ; STITUTION OF RADIO A|SYMPOSIUM ON QUANTITATIVE MAGNETOSPHERIC MODELS; Mar 18, 1970; BOULDER, CO
    Format: text
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    NASA TECHNICAL REPORTS
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