Type Pi 1-2 magnetic field pulsations

Details Type Pi 1-2 magnetic field pulsations Type Pi 1-2 magnetic field pulsations

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...28..191h&link_type=abstract

Space Science Reviews, vol. 28, no. 2, 1981, p. 191-221.

Computer Science

Sound

24

Auroral Zones, E Region, Geomagnetic Micropulsations, Ionospheric Currents, Magnetohydrodynamic Waves, Polar Substorms, Broadband, Convection Currents, Earth Magnetosphere, Field Aligned Currents, Incoherent Scatter Radar, Ionospheric Conductivity, Ionospheric Sounding, Plasma Layers

Scientific paper

The relationships of type Pi (broadband) pulsations to various other substorm-related phenomena are reviewed. Several of the more popular mechanisms for the origin of Pi activity are discussed in the light of the observations. There is only one mechanism in sight that tentatively accounts for observed characteristics of Pi 1-2 activity at auroral oval and polar cap latitudes and that is the three-dimensional current loop mechanism. If two or more mechanisms are involved in the generation of Pi noise, then it is possible that the garden-hose overstability and/or a drift Alfven wave mechanism operating in the plasma sheet contribute to the observed pulsations. The common feature of all Pi 1-2 events is not the presence of temporal precipitation pulsations but the presence of an E-region, suggesting that enhanced conductivity and E-region currents are required. Pi activity appears to be closely related to unsteady convection in progress. Pi data promise to provide useful information on convection and field-aligned and ionospheric currents.

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