Simple Pi burst micropulsation events and associated aurora at two sites in Alaska

Details Simple Pi burst micropulsation events and associated aurora at two sites in Alaska Simple Pi burst micropulsation events and associated aurora at two sites in Alaska

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..907h&link_type=abstract

Planetary and Space Science, vol. 28, Sept. 1980, p. 907-911, 913-917.

Computer Science

Alaska, Auroras, Geomagnetic Micropulsations, All Sky Photography, Ionospheric Currents, Power Spectra

Scientific paper

Type Pi magnetic-field pulsation bursts were selected for which the associated aurorae were relatively simple and stable and occurred in the ionosphere between College and Fort Yukon in Alaska. Power spectral-density traces for College and Fort Yukon H and D were computed and were studied relative to the aurora and to more complex events presented in earlier studies. The power spectral-density traces associated to simpler aurora were found to be consistent with the assumption of simpler 3-dimensional current systems as generators of Pi waves. The spectra of associated precipitation pulsations had a peak near 10 mHz in common with the magnetic field spectra in all events, and also near 3 mHz in one event. The precipitation pulsations at 3 and 10 mHz may have enhanced the magnetic field spectra at those frequencies through modulation of the ionospheric resistance to the current.

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