The Phase Relationship between ULF Geomagnetic Pulsations and HF Doppler Frequency Shift Oscillations on March 24, 1991

Previous theoretical models showed that, in the middle geomagnetic latitudes the oscillations in the Doppler frequency shift lag and lead the H component of ULF pulsations field on the ground, owing to the advection and compression mechanisms by 90°, respectively. On March 24, 1991, measurements obt...

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Bibliographic Details
Published in:Journal of geomagnetism and geoelectricity 1993/01/20, Vol.45(1), pp.109-114
Main Authors: Liu, J. Y., Huang, Y. N., Berkey, F. T.
Format: Article
Language:English
Subjects:
Earth, ocean, space
Exact sciences and technology
External geophysics
Magnetic pulsations
Physics of the magnetosphere
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Summary:Previous theoretical models showed that, in the middle geomagnetic latitudes the oscillations in the Doppler frequency shift lag and lead the H component of ULF pulsations field on the ground, owing to the advection and compression mechanisms by 90°, respectively. On March 24, 1991, measurements obtained from a CW-HF Doppler sounding system and a fluxgate magnetometer show phase differences of 15°-77° between the Doppler frequency shift oscillations and the H component of ULF pulsations field at ground level, which indicates that the Doppler velocity arises from predominant changes due to the compression mechanism.
ISSN:0022-1392
2185-5765
DOI:10.5636/jgg.45.109