On the spectral index of the Pi1B power spectrum

Details On the spectral index of the Pi1B power spectrum On the spectral index of the Pi1B power spectrum

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..375b&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 7, Aug. 1989, p. 375-386.

Physics

4

Auroral Zones, Geomagnetic Micropulsations, Power Spectra, Amplitude Distribution Analysis, Finland, Ground Stations, Ionospheric Propagation, Magnetic Induction

Scientific paper

A power law fit is applied to spectra of a Pi1B-type magnetic pulsation observed along the Finnish meridional chain of stations. It is shown that the Pi1B power spectrum is well described by a power law in the frequency range 0.2-1.4 Hz. The statistical average of the spectral power index at the observation site where the Pi1B amplitude maximum is observed is - 4.2 + or - 0.6, the index being lower, on average, south and north of this site. The effects of ionospheric screening, signal propagation, and magnetic induction on the spectral index are evaluated, and it is shown that magnetic induction in the earth's crust has little effect on the spectral index in the frequency range considered here.

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