Postsunset rise of F layer height in the equatorial region and its relation to the F layer dynamo polarization fields

Details Postsunset rise of F layer height in the equatorial region and its relation to the F layer dynamo polarization fields Postsunset rise of F layer height in the equatorial region and its relation to the F layer dynamo polarization fields

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6237g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6237-6246.

Physics

17

Diurnal Variations, Dynamo Theory, Equatorial Atmosphere, F Region, Night Sky, Polarization (Waves), Solar Activity Effects, Annual Variations, Ionosondes, Solar Terrestrial Interactions, Sunset

Scientific paper

The behavior of the postsunset rise of the F layer at the equatorial stations Thumba/Kodaikanal (India) was studied under different conditions, to identify parameters that affect the F region dynamo field. An examination of the evening height rise features showed that, for high solar activity conditions, there is a sharp increase in h'F and h(p) in the postsunset period, whereas for low solar activity this increase is very small. The increase in h'F is maximum for equinox months. The height of the magnetic activity for disturbed days is lower during equinox and winter, as compared with quiet days, but is marginally higher during summer. It is shown through model calculations that the E region density (conductivity) gradient in the postsunset period is higher by a factor of 2 for high solar activity, as compared to low solar activity, and hence this density gradient is partly responsible for the observed solar activity variation of the postsunset height rise of the F layer.

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