Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..149y&link_type=abstract
Planetary and Space Science, Volume 38, Issue 1, p. 149-159.
Computer Science
2
Scientific paper
The structure and dynamics of the auroral precipitation regions associated with the pulsating aurora, as well as the relationship between auroral and geomagnetic pulsations have been investigated on the basis of the data obtained at Heiss Island during the winter season of 1985-1986. It is shown that the auroral pulsations in the period range 5-50 s are generally observed in the prenoon sector and are accompanied by Pil magnetic pulsations. Both geomagnetic and auroral pulsations are generated in the region of the auroral ratio I6300/ I5577 < 1 equatorward of the intensive 630.0 nm luminosity band. During observations of the pulsating aurora there appeared an auroral intensity trough between the mid-day red auroral band and the region of the diffuse 557.7 nm luminosity formed by the hard electron precipitation. Two types of the auroral pulsations can be distinguished in optical observations. The first type is recorded by photometers in the form of a quasi-periodic irregular increasing of the auroral luminosity generally in 557.7 and 427.8 nm emissions. These pulsations are associated with short-living diffuse auroral bands which are formed in an auroral intensity trough. The second type of the auroral pulsations is formed by a quasi-periodic expansion of the region of the hard electron precipitation. The northern boundary of this region undergoes high-frequency modifications that are recorded as amplitude-modulated pulsations.
Leontiev S. V.
Vorobjev Vyacheslav G.
Yagodkina Oksana I.
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