Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1384b&link_type=abstract
Journal of Geophysical Research, Volume 108, Issue A10, pp. SMP 11-1, CiteID 1384, DOI 10.1029/2002JA009801
Physics
20
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Ionospheric Disturbances
Scientific paper
We surveyed 10 years of CANOPUS Churchill line magnetometer data for Pc5 pulsations and catalogued over 4500 hours of pulsation activity (3334 Pc5 pulsation intervals). Many previously observed Pc5 pulsation characteristics are evident in our data including the dawn/dusk occurrence asymmetry, antisunward propagation patterns, strong correlations between Pc5 band power spectral density (PSD) and solar wind flow speed, increased Pc5 pulsation occurrence during times of high solar wind speeds, and statistical evidence for Pc5 pulsation polarization sense reversals in latitude and local time (across local noon). Our investigation also revealed some as of yet unreported results such as a good correlation between solar wind speed/Pc5 band PSD in all MLT sectors, increased Pc5 pulsation occurrence with IMF Bz northward conditions (for all MLTs), and the prevalence of Pc5 pulsations under all Pc5 band relative power values. We used a subset of 800 data intervals which contained Pc5 pulsations in at least three Churchill line stations to search for pulsations that exhibit classic FLR characteristics. Four hundred and fifty of these pulsations matched the FLR criteria and we discovered that the FLR MLT occurrence distribution is asymmetric about local noon with more pulsations occurring in the morning sector (0600-1200 MLT) than the afternoon sector (1200-1800 MLT), and an absence of FLRs at local noon. We also found that the MLT occurrence distribution for the remaining 350 ``non-FLR'' pulsations is symmetric about local noon and has a (nonzero) local minimum at noon. In contradiction with the results of some previous studies, we find no evidence of stable, recurring, discrete Pc5 pulsation frequencies in our data set. Instead, our statistics show a continuous distribution of central frequencies and a general lack of frequency stability throughout the course of individual Pc5 pulsation events.
Baker Gregory J.
Donovan Eric F.
Jackel Brian J.
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