Transient ULF pulsation decay rates observed by ground based magnetometers - The contribution of spatial integration

Details Transient ULF pulsation decay rates observed by ground based magnetometers - The contribution of spatial integration Transient ULF pulsation decay rates observed by ground based magnetometers - The contribution of spatial integration

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..607p&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, June 1985, p. 607-616.

Physics

44

Decay Rates, Electromagnetic Pulses, Extremely Low Radio Frequencies, Ionospheric Currents, Atmospheric Models, Current Density, Geomagnetic Latitude, Magnetometers, Ohmic Dissipation, Transient Response

Scientific paper

An empirical model of the ionospheric currents of transient toroidal-mode eigenoscillations is used to investigate the effect of spatial incoherence on ground magnetometer data. The model is based on three separate ion current density approximations: a steady-state spatially limited uniform current model, a relatively narrow Gaussian current of about 2 degrees, and a broader Gaussian current of about 4 degrees. The simulated ground magnetometer data show that smearing of amplitude and period with latitude can be reduced or even eliminated for most latitudes. For all spatial scales, the observed decay rates were found to be 2-3 times higher than the true values due to the additional decay resulting from spatial integration of incoherent transient pulsations. Estimates of the ionospheric Pedersen conductance based on ground magnetometer data observations of decay rates were found to be too low. A correction is offered to reconcile observed decay rates on the ground with those predicted under the assumption that Joule dissipation is the dominant damping mechanism for toroidal-mode resonant oscillations.

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