foF2 hysteresis variations and the semi-annual geomagnetic wave

Details foF2 hysteresis variations and the semi-annual geomagnetic wave foF2 hysteresis variations and the semi-annual geomagnetic wave

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..755a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 7, p. 755-757

Physics

5

Critical Frequencies, F 2 Region, Geomagnetism, Hysteresis, Magnetic Variations, Periodic Variations, Sunspot Cycle, Amplitudes, Equinoxes, Geomagnetic Latitude, Magnetic Storms, Mean

Scientific paper

Seasonal and solar cycle variations of the foF2 hysteresis magnitude are investigated. Data for the noon and foF2 monthly medians for Slough (51.38 deg N, 0.57 deg W), the monthly means for the sunspot numbers, and for the geomagnetic activity index aa(N) for the northern hemisphere for the period 1933-1986, covering solar cycle from 17 to 21, are used. It is found that: (1) the greatest negative amplitudes of the foF2 hysteresis variation are near the equinoxes, and (2) the solar cycle average noon foF2 hysteresis magnitude is linearly correlated with the solar cycle average semi-annual geomagnetic amplitude of the aa-index. These results support the hypothesis that the foF2 hysteresis is due to the geomagnetic activity variation during the sunspot cycle.

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