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

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm51b..07l&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM51B-07

Other

2706 Cusp, 2752 Mhd Waves And Instabilities (2149, 6050, 7836)

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 (76.31° Magnetic Latitude), Longyearbyen (75.26° Magnetic Latitude) and Hornsund (74.24° 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 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. Another important aspect of the Pc3 pulsations, polarization characteristics, was also statistically studied. The results show that Pc3 pulsations observed at our Svalbard stations were predominantly left-hand polarized.

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