Ionospheric control of polarization of low-latitude geomagnetic micropulsations at sunrise

Details Ionospheric control of polarization of low-latitude geomagnetic micropulsations at sunrise Ionospheric control of polarization of low-latitude geomagnetic micropulsations at sunrise

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..703s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Aug. 1982, p. 703-712.

Physics

19

Geomagnetic Micropulsations, Ionospheric Conductivity, Magnetohydrodynamic Waves, Polarization Characteristics, Sunrise, Tropical Regions, Annual Variations, Atmospheric Attenuation, E Region, Electric Current, Hall Effect, Statistical Analysis

Scientific paper

The ionospheric control of low latitude pulsation polarization characteristics suggested by Saka et al. (1980) has been confirmed through continuous low latitude Pc3 and Pc4 geomagnetic micropulsation observations. The D-component amplitude increases as much as that of the H-component after sunrise, effecting the tilting of the major polarization ellipse axis from north to northwest. This coincides with the appearance of the E-layer in the ionosphere within an hour, and the time of the coincidence shifts from season to season in parallel with changes of sunrise. The ellipticity of the horizontal plane polarization is not appreciably affected by sunrise. It is suggested that the Hall conductivity increment associated with the E-layer sunrise enhancement affects the characteristics of the D-component on the ground.

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