Collapse of the equatorial ionosphere during the sunrise period

Details Collapse of the equatorial ionosphere during the sunrise period Collapse of the equatorial ionosphere during the sunrise period

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..205r&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 6, April 1988, p. 205-209. Research supported by the Ministry of Science and Technolo

Computer Science

Sound

4

Equatorial Atmosphere, F Region, Ionospheric Disturbances, Ionospheric Electron Density, Ionospheric Drift, Ionospheric Sounding, Sunrise

Scientific paper

The paper discusses the phenomenon of abnormally large values of slab thickness of the equatorial ionosphere at presunrise hours. The phenomenon is concurrent with a large ratio of electron content above and below the F2 peak and with the occurrence of daily minimum of Nm and Nt. It is shown that the phenomenon is consequent with the collapse of the bottomside F2-layer, the maximum electron density reducing to a value of 10 to the 10th electrons/cu m or even less than measurable by normal ionosondes. The whole phenomenon is suggested as being primarily due to electromagnetic effects caused by a large presunrise reversal magnitude of the westward electric field in the equatorial region.

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