The effect of damping on geomagnetic pulsation amplitude and phase at ground observatories

Details The effect of damping on geomagnetic pulsation amplitude and phase at ground observatories The effect of damping on geomagnetic pulsation amplitude and phase at ground observatories

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..619g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, May 1984, p. 619-628.

Physics

26

Atmospheric Models, Geomagnetic Pulsations, Magnetospheric Instability, Amplitudes, Forced Vibration, Ground Stations, Latitude, Night Sky, Oscillations, Vibration Damping

Scientific paper

The amount of damping applicable to geomagnetic pulsation waveforms is quantified. Allowance is made for the variations in ionospheric conductivities in predicting the changes in amplitude and phase of geomagnetic pulsations over an extended latitudinal array of ground observatories. Three situations are modeled in which the damping factor, which is related to the amplitude loss per cycle, is different. In the first, the damping factor (the ratio of the energy dissipative resistance to the oscillation to the angular frequency) is approximately equal to 0.01; this, it is noted, corresponds to the ionospheric Joule damping of Newton et al. (1978). In the second situation, the damping factor is equal to 0.1, a value consistent with the empirically determined daytime damping factors from the observed latitude-dependent transient decays of the pulsation single effect events discussed by Siebert (1964). In the third situation, the factor is latitude-dependent, and three different levels of damping are used. These are appropriate for the nighttime conditions associated with the auroral electrojet, plasmatrough, and plasmasphere.

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