Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0539r&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0539
Physics
2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
We present an interval of long-lasting Pc6 pulsations following an extremely active day, which may shed light on the communication between ULF waves and high-energy electrons. Virtually monochromatic large amplitude highly-polarised pulsations were observed by the CANOPUS magnetometer chain at dusk for many hours, during which the Cluster spacecraft constellation traversed the dusk magnetopause. The solar wind conditions are very steady, the solar wind speed is fast, and time series analysis of the solar wind data shows no significant power concentrated in the Pc6 band. 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 LANL SOPA data at all local times. While Cluster is in the vicinity of the magnetopause, it provides clear evidence of boundary oscillations with essentially the same periodicity as the ground and geosynchronous observed pulsations. This event is an excellent example of global ULF activity driven by compressional waves which are in turn driven by magnetopause oscillations. These oscillations are clearly not present in the solar wind, and the frequency is clearly selected by the magnetopheric characteristics. The fact that these oscillations are observed globally in the magnetosphere, but only in the dusk sector in the ionsphere, supports the idea that local time distribution of ground-observed ULF pulsations is at least partly due to the ionospheric response to ULF waves.
Baker George
Cowley Stanley W.
Donovan Eric
Fenrich F. R.
Henderson Matthew
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