Daytime F2-layer positive storm effect at middle and lower latitude

Details Daytime F2-layer positive storm effect at middle and lower latitude Daytime F2-layer positive storm effect at middle and lower latitude

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..532m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 13, no. 5, p. 532-540

Physics

25

E Region, Magnetic Storms, Plasma Drift, Temperate Regions, Thermosphere, Tropical Regions, Wind Effects, Gas Composition, Ionosondes, Mathematical Models, Nitrous Oxides

Scientific paper

Daytime F2-layer positive storm effects at middle and lower latitudes in the winter thermosphere are analyzed using AE-C, ESRO-4 neutral gas composition data, ground-based ionosonde observations and model calculations. Different longitudinal sectors marked by the storm onset as night-time and day-time demonstrate different F2-layer positive storm mechanisms. Neutral composition changes in the night-time sector with increased (O) and (N2) absolute concentrations, while (N2/O)(sub storm)/(N2/O)(sub quiet) approx. equals 1 at F2-layer heights, are shown to contribute largely to the background N(sub m)F2 increase at lower latitudes lasting during daytime hours. Storm-induced surges of the equatorward wind give rise to an additional N(sub m)F2 increase above this background level. The mid-latitude F2-layer positive storm effect in the daytime sector is due to the vertical plasma drift increase, resulting from the interaction of the bckground (poleward) and the storminduced (equatorward) thermospheric winds, but not to changes of (O) and (N2) concentrations.

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