A multistation study of long period geomagnetic pulsations at cusp and boundary layer latitudes

Details A multistation study of long period geomagnetic pulsations at cusp and boundary layer latitudes A multistation study of long period geomagnetic pulsations at cusp and boundary layer latitudes

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..667d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 5, p. 667-679

Physics

5

Geomagnetic Pulsations, Latitude, Magnetohydrodynamic Waves, Planetary Boundary Layer, Polar Cusps, Solar Wind, Kelvin-Helmholtz Instability, Power Spectra, Solar Terrestrial Interactions, Wave Propagation

Scientific paper

The characteristics of 1-20 mHz (Pc5) geomagnetic pulsations recorded during the daytime on the ground at cusp and boundary layer latitudes have been examined. On quiet and moderately disturbed days the major spectral contributions are due to three different mechanisms. Sustained oscillations whose properties are consistent with the Kelvin-Helmholtz instability at the low latitude boundary layer are the dominant mechanism at -70 to -75 deg geomagnetic latitude. Transient irregular pulsations are frequently seen at single stations at the foot of polar cap and boundary layer field lines. Occasionally similar transients occur essentially simultaneously at widely spaced stations accompanied by absorption spikes on riometer records. The latter signals are most likely due to solar wind pressure pulses on the magnetopause. At cusp latitudes the major spectral contribution arises from sustained irregular pulsations centred on magnetic noon. Although their occurrence is related to the proximity of the cusp's particle signature, it may be more appropriate to discuss these signals in terms of fluctuations in boundary layer or mantle currents.

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