Global onset and propagation of large-scale travelling ionospheric disturbances as a result of the great storm of 13 March 1989

Details Global onset and propagation of large-scale travelling ionospheric disturbances as a result of the great storm of 13 March 1989 Global onset and propagation of large-scale travelling ionospheric disturbances as a result of the great storm of 13 March 1989

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..583h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, April 1991, p. 583-593.

Other

35

Magnetic Storms, Solar Terrestrial Interactions, Traveling Ionospheric Disturbances, Auroral Electrojets, E Region, F Region, Solar Activity Effects, Sunspots

Scientific paper

Exceptionally large auroral disturbances, associated with the sunspot maximum, occurred on March 12-14, 1989, culminating in severe substorm activity between 12:00 and 15:00 U.T., on March 13, 1989 when the planetary magnetic Kp-index was 8 + and auroral electrojet index (AE) reached a value of 2000 nT. The global effect of the substorm was particularly evident from large rises of the virtual height of the F-region (h-prime F) and from large ionization depletions found from the critical frequency (foF2) decreases of the layer, using data from 46 ionosonde stations. The fluctuations in h-prime F showed a significant correlation with auroral surges, deduced from the AE index. The evidence of sequential enhancements in h-prime F and associated ionization depletions, indicated the presence of large-scale traveling disturbances (LSTIDs) launched during the disturbed period and propagation to low latitudes. LSTIDs moved with velocities between 460 and 530 m/s, originating equatorwards of the auroral zone at the shell with an L-value = 2.3. The exceptionally large and rapid enhancements in h-prime F, with the height increments exceeding 200 km and reaching 400 km, as well as the shift of the origin of LSTIDs to higher midlatitudes, are the unusual aspects of the present disturbances, distinguishing them from other cases of LSTIDs studied on the global scale.

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