Physics
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10211375o&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A6, p. 11375-11384
Physics
17
Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities
Scientific paper
Previous studies have taken data from multi-instrument arrays, both ground-based and in situ, to determine the spatiotemporal characteristics of Pc 3 pulsations (22-100 mHz) at cusp latitudes. Correlations of Pc 3 frequency band magnetometer, photometer, and riometer data have been cited as evidence of a local (ionospheric), rather than a distant (magnetospheric), source for these cusp pulsations. Electron precipitation modulated at Pc 3 frequencies is thought to be the source mechanism for the unstructured portion of the Pc 3 spectrum; such precipitation can modify local ionospheric conductivities, allowing modulated currents to flow at like frequencies. In this paper we undertake a statistical analysis of induction coil magnetometer records taken at Cape Parry and Sachs Harbor, Canada, in May-June 1985. Comparing the distribution functions of interstation X-X and Y-Y polarization and coherence estimates, we arrive at a simple model to estimate an upper bound for the coherence length, (200km), of Pc 3 source regions near the cusp. Such a determination is an important constraint in identifying the source of Pc 3 frequency band modulations of cusp latitude electron precipitation.
Olson John V.
Szuberla Curt A. L.
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