Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..785h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, June 1987, p. 785-791.
Physics
36
Auroral Zones, Traveling Ionospheric Disturbances, F Region, Ionograms, Magnetic Storms, Particle Precipitation, Riometers
Scientific paper
An analysis of midatlantic ionograms obtained in 1979 suggests that rapid onsets in auroral precipitation at the time of commencements of the intense geomagnetic substorms in the northern and southern auroral zones can be associated with a simultaneous launching of periodic large-scale (LS) TIDs, propagating equatorwards in both hemispheres. Data indicate that periodic LS TIDs probably produce a constructive interference effect at the points of their encounter near the equator, and that LS TID sources in both hemispheres were elongated along the L-shell with an L-value of 4-5 and a longitudinal extent greater than 60 deg. Source locations were consistent with the positions of the belts of energetic particle precipitations, and the large quasi-linear extent of the source is shown to be consistent with the wide horizontal wavefronts of LS TIDs and with their large propagation distance.
Hajkowicz Lech A.
Hunsucker Robert D.
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