Global F2 layer ionization and geomagnetic activity

Details Global F2 layer ionization and geomagnetic activity Global F2 layer ionization and geomagnetic activity

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712153l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,153-12,159.

Physics

6

Atmospheric Ionization, F 2 Region, Geomagnetism, Annual Variations, Critical Frequencies, Diurnal Variations

Scientific paper

A global or planetary index value for the ionization density of the F2 layer can be found by suitably averaging the diurnal critical frequency values as observed at different stations along all parallels of latitude and longitude. Monthly planetary values of F2 layer ionization show marked maxima around the equinoxes. It is shown that the seasonal trends of the EUV index F10.7 and the geomagnetic index Ap, when combined in the ratio of 4:1, reproduce faithfully the observed seasonal trend of planetary F2 layer ionization. Detailed analysis shows that the seasonal enhancement of the planetary F2 ionization is not limited to the planetary scale but is also applicable to the averaged diurnal ionization along any pair of conjugate dip latitudes when taken together.

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