Physics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13...95h&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 1, p. 95-104
Physics
7
Auroral Electrojets, F Region, Ionospheric Storms, Sunspots, Traveling Ionospheric Disturbances, Auroral Zones, Diurnal Variations, Ionosondes
Scientific paper
The rapid onset in auroral substorm activity, as indicated by the AE index, has been associated with the ionospheric virtual height enhancement (Delta h' F) over a sunspot maximum period (1980-1982) and for a range of latitudes. The height increments, characteristic of large-scale ionospheric disturbances, were traced at 18 ionosonde stations in the Asian-Australian and European-African sectors following pre-midnight isolated auroral substorm onsets. An apparent periodic ionospheric response was noted, with the second maximum of Delta h' F consistently observed near the sunrise sector, particularly for the Asian region. Further analysis, using the Delta h' F data from a longitudinal chain of Japanese stations, applied to isolated substorms occurring in the post-midnight sector, showed a consistent morning height enhancement. Finally, the statistical analysis of 141 substorm onsets indicated that the morning height enhancement, particularly in winter, is a prominent feature of the disturbed ionosphere during sunspot maximum. A possible link may exist between the median virtual height maximum in the morning and the storm-induced h' F enhancement.
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