Open AccessComplex demodulation applied to Pi2 geomagnetic pulsations
Author(s) -
Beamish D.,
Hanson H. W.,
Webb D. C.
Publication year - 1979
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1979.tb01035.x
Subject(s) - plasmasphere , geophysics , ionosphere , earth's magnetic field , amplitude , polarization (electrochemistry) , physics , computational physics , geology , magnetic field , magnetosphere , optics , quantum mechanics , chemistry
Summary The spectral technique of complex demodulation is applied to Pi2 pulsations recorded along a meridional profile. The technique provides instantaneous values of amplitude and phase and allows frequency dispersion to be taken into account. The variations of magnetospheric wave polarization parameters are observed as a function of both space and time. The results are directly compared with recent theories of the resonance of geomagnetic field lines and the effects of the ionosphere on ground based observations. The theoretical predictions are tested and the experimental results indicate that the night‐time ionosphere is capable of a controlling influence on the source characteristics of these magnetospheric waves in the plasmapause region.