Characterization of ionospheric Doppler oscillations in the Pc3-4 and Pi2 magnetic pulsation frequency range

Details Characterization of ionospheric Doppler oscillations in the Pc3-4 and Pi2 magnetic pulsation frequency range Characterization of ionospheric Doppler oscillations in the Pc3-4 and Pi2 magnetic pulsation frequency range

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..495m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 4, April 1992, p. 495-507. Research supported by Australian Research

Computer Science

Sound

9

F Region, Geomagnetic Micropulsations, Magnetohydrodynamic Waves, Magnetometers, Transverse Waves, E Region, Extremely Low Radio Frequencies

Scientific paper

Conditions are examined under which perturbations in ionospheric parameters, including phase height and Doppler shift in frequency of a reflected HF radio signal, are associated with geomagnetic pulsations recorded simultaneously on the ground. Particular attention is given to an extensive HF Doppler sounder/pulsation magnetometer data set. It is suggested that Doppler oscillations associated with Pc3-4 pulsations of amplitude less than or equal to 3.0 nT on the ground are most likely due to wave-driven compression and rarefaction of the ionospheric plasma. Estimates of the pulsation scale size in the ionosphere suggest that the magnetic pulsations are due to field line resonances and global cavity mode oscillations. Shortcomings of the existing models relating the ionospheric Doppler oscillations to the downgoing hm waves are also discussed. It is concluded that downgoing hm waves make a significant contribution to the ionospheric perturbation spectrum and to clutter of the Doppler spectrum in high-resolution studies.

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