Investigations of Pi2 micropulsations-I. Frequency spectra and polarisation

Details Investigations of Pi2 micropulsations-I. Frequency spectra and polarisation Investigations of Pi2 micropulsations-I. Frequency spectra and polarisation

May 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21..721d&link_type=abstract

Planetary and Space Science, Volume 21, Issue 5, p. 721-730.

Computer Science

Scientific paper

Pi2 micropulsations are recorded at four sites with approximately the same geo-magnetic longitude but spanning 36° in latitude. Frequency analyses on these signals show that they normally contain more than one spectral component and that these components, all of which commence simultaneously, are not normally harmonically related. In addition, the spectral content is found not to vary significantly with latitude. sNo ignificant correlations are found between Kp and the maximum period, the minimum period, or the number of frequency components, in a Pi2. However the `average' Pi2 frequency is found to vary linearly with both Kp and the magnitude of the accompanying auroral bay. In addition, the signals measured at the `low' and at the `high' latitude sites are found to exhibit an overwhelming preference for the left-hand sense of polarisation, while those at the `middle' latitude sites show no preference for either sense.

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