Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm31b..07w&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM31B-07
Physics
2700 Magnetospheric Physics (6939), 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Geomagnetic pulsations are considered one of the modes of energy and momentum transfer between the solar wind and magnetosphere, and different plasma regions within the magnetosphere. These ultra low frequency (ULF) electromagnetic waves are usually identified using ground based magnetometer measurements and are categorized based on frequency. In this study we have used eleven years of GOES satellite geosynchronous magnetic field measurements to identify and characterize 1214 magnetic pulsation events in the Pc4 and Pc5 bands. Local time of occurrence and frequency were recorded for each pulsation, the latter using time-frequency spectral analysis. The local time distribution for pulsation occurrence showed a broad dayside peak and the seasonal distribution indicated high pulsation occurrence in the winter months compared to summer months. Pulsations also occurred over a wide range of frequencies, however discrete frequency bands were observed in some individual events. These observations and their implications will be discussed.
Jayachandran P. T.
Watson Christer
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