Computer Science
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..663o&link_type=abstract
Planetary and Space Science, vol. 25, July 1977, p. 663-671. Research supported by the National Research Council of Canada.
Computer Science
4
Auroral Zones, Geomagnetic Micropulsations, Latitude, Magnetospheric Instability, Polar Substorms, Amplitudes, Bandpass Filters, Ionospheric Currents, Magnetic Signatures, Spectrum Analysis
Scientific paper
Evidence from spectral analysis of Pi2 pulsations detected during a substorm by a meridian chain of magnetometers is presented to support the conclusion that at auroral latitudes, there is no apparent correlation between the principal spectral components of Pi2 pulsations and the latitude of the observations. From these data it is inferred that the Pi2 magnetic variations observed at earth's surface are not generated by simple MHD eigenoscillations of the magnetospheric field. The data show clear contributions to the Pi2 pulsation spectrum by ionospheric currents. These observations lead to the suggestion that Pi2 pulsation spectra are produced by the sudden changes in magnetospheric and ionospheric current systems that take place at the beginning of a substorm.
Olson John V.
Rostoker Gordon
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