Determining the Propagation Direction and Velocity of Pc 1-2 Waves using Search Coil Magnetometers on Svalbard

Details Determining the Propagation Direction and Velocity of Pc 1-2 Waves using Search Coil Magnetometers on Svalbard Determining the Propagation Direction and Velocity of Pc 1-2 Waves using Search Coil Magnetometers on Svalbard

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1677n&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1677

Physics

[2487] Ionosphere / Wave Propagation, [2731] Magnetospheric Physics / Magnetosphere: Outer, [2752] Magnetospheric Physics / Mhd Waves And Instabilities

Scientific paper

Electromagnetic ion cyclotron (EMIC) waves observed by ground-based arrays of search coil magnetometers can provide remote diagnostics of plasma processes in Earth’s magnetosphere. Horizontal ducting of these waves in the ionosphere, however, makes it difficult to locate the magnetic latitude at which such waves are generated. We have used data since August 2008 from a closely-spaced two-dimensional array of four search coil magnetometers on Svalbard, at magnetic latitudes from ~74° to ~76° and with interstation separations of ~100 km, to determine the horizontal propagation direction and velocity of a number of Pc1-2 wave events with duration ≥1 hour. Using interstation time lags determined by both cross-correlation analysis and cross-phase analysis of filtered dB/dt records, and assuming plane wave fronts, we have determined wave velocities typically near 300 km/s and propagation predominantly from lower latitudes. Hankasalmi SuperDARN radar returns from the Svalbard region were used to estimate the latitude of the cusp. All of the events studied were found to be consistent with wave sources in the outer dayside magnetosphere.

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