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  • 1
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    D region predictions (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Present knowledge of D region phenomena is briefly reviewed and the status of current methods of predicting their effects on radio propagation considered. The ELF, VLF and LF navigational and timing systems depend on the stability of the lower part of the D layer where these waves are reflected, whereas MF and HF waves are absorbed as they penetrate the region, in most cases mainly in the upper part of the layer. Possible methods of improving predictions, warnings, and real time operations are considered with particular stress on those which can be implemented in the near future.
    Keywords: GEOPHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 573-598
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Winter Anomaly 1982/83 in Comparison with Earlier Winters (1960-82) (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The winter anomaly in the winter of 1982/83 is compared with the winter anomalies of earlier winters (1960-82) from the point of view of amplitude and timing of the winter anomaly, and geomagnetic and dynamic activity influences. Some evidence of a negative influence of sudden stratospheric warnings on the winter anomaly is given.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 62-65
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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