Evolution and Characteristics of Global Pc5 observations of ULF waves During a High Solar Wind Speed Event.

Details Evolution and Characteristics of Global Pc5 observations of ULF waves During a High Solar Wind Speed Event. Evolution and Characteristics of Global Pc5 observations of ULF waves During a High Solar Wind Speed Event.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1165r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1165

Physics

2487 Wave Propagation (6934), 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present an interval of long-lasting Global Pc5 oscillations during a high solar wind speed event, during which there is an excellent conjunction between the Cluster and Polar spacecraft on the dusk flank, and ground-based instrumentation. Virtually monochromatic large amplitude highly-polarised pulsations were observed by the CANOPUS magnetometer chain at dusk for many hours, which we identify as being a field line resonance. Many radars of the SuperDARN HF network observed clear pulsations of similar frequencies as these radars rotated into the dusk sector ionosphere. The pulsations are observed in geosynchronous data at all local times. We analyse the solar wind data to verify the source of these oscillations. Cluster field and plasma instruments indicate Kelvin-Helmholtz type activity on the magnetopause and Polar observed oscillations in both electric- and magnetic fields. We analyse these fluctuations in local field-aligned coordinates and calculate the poynting fluxes along and perpendicular to the field to fully understand the nature of these oscillations. We present these results in terms of previous studies and discuss possible source mechanisms.

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