Poleward propagation of pulsations near the cusp

Details Poleward propagation of pulsations near the cusp Poleward propagation of pulsations near the cusp

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..775o&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, July 1989, p. 775-781.

Computer Science

9

Geomagnetic Pulsations, Magnetometers, Polar Cusps, Pulse Amplitude, Solar Wind, Canada, Extremely Low Radio Frequencies, Morphology, Spectral Bands

Scientific paper

During 1985 magnetometer stations were operated at Cape Parry and Sachs Harbor, Canada, to investigate the spectrum of geomagnetic pulsations at high latitudes and near the polar cusp. Each day, as the stations move under the dayside cusp, the level of pulsation power increases by several orders of magnitude. The spectrum is broadband, reaching from below 5 mHz to above 1 Hz with enhancements near 5 and 40 mHz. The 5-mHz power is produced, in part, by discrete pulses which may be interpreted as due to evolving current patterns in the overhead ionosphere. The pulses have amplitudes of 50-100 nT, temporal widths of a few minutes and show time delays between the two stations which indicates poleward motion at 1-5 km/s. Consistently, for every pulse, the time delay depends upon the component of the magnetometer used. The largest time delays occur for the Z-component and these are about twice the delays measured using the H- and D-components.

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