Statistical study of the equatorial F2 layer critical frequency at Ouagadougou during solar cycles 20, 21 and 22, using Legrand and Simon’s classification of geomagnetic activity | Journal of Space Weather and Space Climate

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Table 3.

Characteristics of the observations of foF2, (a) for the sunspot maximum during winter and spring for the four classes of geomagnetic activity, and (b) for the sunspot maximum during summer and autumn for the four classes of geomagnetic activity.

	Winter						Spring
	foF2 graph characteristics
	Sunspot maximum
	Morning peak		Midday trough		Evening peak		Morning peak		Midday trough		Evening peak
Geomagnetic classes of activity	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)
Quiet	9	11.51	11	11.03	16	12.54	10	13.33	14	12.40	16	13
Fluctuating	10	12.68	12	11.30	17	12.45	11	14	14	11.85	16	12.35
Recurrent	11	13.50	–	–	–	–	10	12.75	14	11.10	15	11.45
Shock	10	14.67	–	–	–	–	10	15	–	–	–	–

	Summer						Autumn
	foF2 graph characteristics
	Sunspot maximum
	Morning peak		Midday trough		Evening peak		Morning peak		Midday trough		Evening peak
Geomagnetic classes of activity	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)	Local time	foF2 (MHz)
Quiet	10	11.87	14	10.63	18	11	10	9.44	12	8.48	18	11.54
Fluctuating	11	12.63	15	11.02	18	11.70	11	12.25	16	10.20	17	10.67
Recurrent	13	11.44	–	–	–	–	10	13	13	11	16	12.20
Shock	10	11	11	10.20	17	11.70	10	13.30	15	10.53	17	11.07

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