Auroral electrojet effect on the global occurrence pattern of large scale travelling ionospheric disturbances

Details Auroral electrojet effect on the global occurrence pattern of large scale travelling ionospheric disturbances Auroral electrojet effect on the global occurrence pattern of large scale travelling ionospheric disturbances

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1189h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, Aug. 1991, p. 1189-1196.

Computer Science

31

Auroral Electrojets, F Region, Ionosondes, Sunspots, Traveling Ionospheric Disturbances, Diurnal Variations, Gravity Waves, Solar Terrestrial Interactions

Scientific paper

Hourly values of the virtual height enhancements of the F-region, from 15 ionosonde stations in both hemispheres, were compared with the corresponding hourly values of the AE index for the year of sunspot maximum (1980). It is evident that surges in the auroral electrojet generate trains of large scale travelling ionosphere disturbances (LSTIDs) in both hemispheres,subsequently propagate equatorward causing substantial height enhancements from subauroral to equatorial latitudes. A high degree of correlation exists between the current surges (represented by the variability of AE index) and Delta-h-prime F in the nighttime sector, with an average correlation coefficient of 0.7 and on some occasions reaching 0.9. The optimum correlation between these two different parameters exists for an average time lag of 1.6 h between the onset of an auroral surge and the corresponding value of Delta-h-prime F in midlatitudes. The ratio of the distance (from the auroral oval to a midlatitude location) of travel of LSTIDs to the time lag corresponds to an average equatorward velocity (500 m/s) of the disturbance. The correlation between AE and Delta-h-prime F depends strongly on solar illumination condition and is absent in the daytime sector. The amplitude of LSTIDs, as represented by the magnitude of Delta-h-prime F, tends to be largest in subauroral locations near the source region. It rapidly decreases in midlatitudes and remains fairly constant from mid to lowlatitudes, with a slight tendendency to increase at the equator.

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