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  • GEOPHYSICS  (2)
  • 1980-1984  (2)
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  • GEOPHYSICS  (2)
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  • 1
    Publication Date: 2019-06-28
    Description: The Siple Station conjugate locations in the Northern Hemisphere are examined for the epoch 1975-1990 according to the predictions of three internal source geomagnetic field models (1GRF 1980, Magsat 1980, Barraclough 1975) and one external field model (Mead/Fairfield) under quiet and disturbed conditions. The conjugate location systematically changes in the interval studied, making it imperative that changes be made in the locations of the Northern Hemisphere geophysical stations during the reactivation of Siple Station in 1985-1987.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 5655-565
    Format: text
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  • 2
    Publication Date: 2019-06-28
    Description: For three magnetically disturbed days in early 1980, data from south polar masses of the Magsat satellite are compared with data from search coil magnetometer, riometer, and photometer instrumentation at Siple, Antarctica. It is found that during each Magsat polar pass in the morning sector, the level of Pi 1 activity correlates well with the intensities of three-dimensional current systems. Fine structure is often observed in the field-aligned currents during periods of intense Pi activity. Among the Birkeland currents are 2-s to 10-s (16-80 km) structured perturbations; these are evident in the transverse components of the field and are thought to indicate filamentary currents. Pi 1 amplitudes are found to be considerably larger when region 2 Birkeland currents are overhead than when they are not. In one case, detailed features are identified in the high-resolution Magsat magnetic field data that may be current fluctuations related to asymmetric Pi 1.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 1602-161
    Format: text
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