Phase variation of ULF pulsations along the geomagnetic field-line

Details Phase variation of ULF pulsations along the geomagnetic field-line Phase variation of ULF pulsations along the geomagnetic field-line

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30..339a&link_type=abstract

Planetary and Space Science, vol. 30, Apr. 1982, p. 339-346.

Computer Science

26

Electromagnetic Pulses, Extremely Low Radio Frequencies, Geomagnetism, Phase Deviation, Electric Fields, Harmonic Analysis, Ionospheric Disturbances, Lines Of Force, Vector Analysis

Scientific paper

Possible sources of confusion in an earlier theory of ULF pulsations with finite ionospheric conductances are examined, with attention to the behavior of the time-integrated Poynting vector in the theory. Where ionospheric conductances are asymmetric the time-integrated Poynting vector is found to be zero at a null point which is displaced away from the equatorial plane, and the wave phase behavior along the field line is consistent with a scheme in which travelling-wave components originate at the null-point and carry energy to the ionospheres. Null-point behavior suggests that phase differences of an unexpected character may be obtained in certain cases, between the equatorial plane and the ionosphere. A discussion is presented of the higher harmonics of resonances having asymmetric conductances, from the viewpoint of electric field phase comparisons using measurements from geostationary satellites.

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