Phase and spectral power of mid-latitude Pi2 pulsations - Evidence for a plasmaspheric cavity resonance

Details Phase and spectral power of mid-latitude Pi2 pulsations - Evidence for a plasmaspheric cavity resonance Phase and spectral power of mid-latitude Pi2 pulsations - Evidence for a plasmaspheric cavity resonance

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1367y&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1367-1383.

Computer Science

66

Auroral Zones, Cavity Resonators, Geomagnetic Pulsations, Midlatitude Atmosphere, Plasmasphere, Spectral Methods, Geomagnetic Latitude, Magnetohydrodynamic Waves, Surface Waves

Scientific paper

An examination has been made of the phase and spectral power of mid-latitude Pi2 pulsations measured on a ground array. The power spectra of pulsations observed on three longitudinally-separated ground observatories show constant frequency spectral peaks over 5-1/2 h of MLT. Apparent longitudinal frequency variations appear to arise from changes in the relative sizes of spectral peaks, not in the frequencies of the peaks themselves. This behavior is not that expected from a surface wave on the plasmapause. Consideration of the phase and power along a meridian shows 180 deg H-component phase shifts seemingly associated with the plasmapause. One or more spectral peak amplitude enhancements are often found equatorward of this position. This behavior is compared with two plasmaspheric cavity resonance models; period estimates are obtained from a time-of-flight model and antinode positions are estimated from a two-dimensional Cartesian plasmasphere model. It is concluded that a plasmaspheric cavity resonance is the most likely mechanism for the mid-latitude Pi2 secondary amplitude maximum.

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