Multi-Instrument Observations of Pc 3-4 Pulsations at Cusp Latitudes in Svalbard, Norway

Details Multi-Instrument Observations of Pc 3-4 Pulsations at Cusp Latitudes in Svalbard, Norway Multi-Instrument Observations of Pc 3-4 Pulsations at Cusp Latitudes in Svalbard, Norway

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31b0454l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31B-0454

Physics

2706 Cusp, 2716 Energetic Particles: Precipitating, 2728 Magnetosheath, 2736 Magnetosphere/Ionosphere Interactions (2431), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

It has been generally accepted that Pc 3-4 pulsations (~ 10-100 mHz) originate in the ion foreshock upstream of the bow shock due to the interaction between reflected ions and the solar wind, but it is not clear how these waves propagate to the high-latitude ionosphere. Many early studies noted increased power in the vicinity of the dayside cusp. In this study, we compared signal power at Pc 3-4 frequencies from searchcoil magnetometers at three closely-spaced stations on Svalbard: Ny Alesund (76.31o Magnetic Latitude), Longyearbyen (75.26o Magnetic Latitude) and Hornsund (74.24o Magnetic Latitude). Data from the SuperDARN Finland HF radar and DMSP satellites were used to accurately locate the cusp latitudes. We found several events where magnetometers showed strong, narrow-band Pc 3-4 signals, while during the same period the SuperDARN radar saw a clear-edged cusp and a DMSP satellite passing overhead observed the typical cusp signature. We found that often the wave packets were localized and linearly polorized. Also most of the time, the signals were strongest equatorward of the cusp, consistent not with entry via the cusp proper but along field lines equatorward of the cusp which map to the boundary layer or outer magnetosphere.

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