Physics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..163f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 163-180.
Physics
38
Scientific paper
The `disturbed/quiet' ratio of the peak electron density NmF2 is expressed in terms of `mean' (DC) and `local time' (AC) variations for over 20 years' data from each of 53 stations between 70°N and 80°S. The local-time and seasonal variations broadly resemble those found for South Atlantic/Antarctic stations by Wrenn et al. (1987, J. atmos. terr. Phys. 49, 901-913) and Rodger et al. (1989, J. atmos. terr. Phys. 51, 851-866). The worldwide data show consistent latitudinal patterns, with NmF2 enhanced in local winter as compared to equinox and summer. The AC variations are consistent in phase (maximum at 15-20 LT) except in the magnetic equatorial region, where the phase is almost reversed. A `long-term' effect is found, in which the data for different periods (sunspot cycles) show markedly different DC levels. The results are interpreted in terms of the `composition change' theory of F2-layer storms. They compare well with the data analysis of Prölss (1980, Rev. geophys. space. Phys. 18, 183-202), with O/N2 ratios derived from the MSIS-90 model, and with results from CTIPM, a coupled thermosphere-ionosphere model.
Field P. R.
Rishbeth Henry
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