Pc 4 giant pulsations in the morning sector

Details Pc 4 giant pulsations in the morning sector Pc 4 giant pulsations in the morning sector

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5153r&link_type=abstract

Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5153-5166. Research supported by the National Research Council of C

Physics

1

Auroral Zones, Geomagnetic Micropulsations, Magnetospheric Instability, Monochromatic Radiation, Plasmapause, Amplitude Modulation, Bandpass Filters, Geomagnetic Latitude, Magnetic Signatures, Magnetometers, Power Spectra

Scientific paper

Geomagnetic micropulsations in the Pc 4 frequency band are analyzed by using meridian line and two-dimensional magnetometer networks. It is found that these pulsations are highly localized in latitude and have a large azimuthal wave number. While such events are extremely rare, they occur on two or more consecutive days. The pulsations occur on quiet days and normally after a sustained period of low magnetospheric activity. The initiation of substorm activity appears to quench these so-called giant pulsations which may return after the substorm has subsided. It is suggested that the pulsations accompany suddenly reduced levels of magnetospheric convection. The Pc giant pulsations may be due to the occurrence of field line resonances at the plasmapause in the region where the electric field changes its azimuthal direction from westward to eastward.

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