Earth, Planets and Space

Table 1 Tweek occurrence observed during winter, equinox, and summer seasons

From: Seasonal variations of nighttime D-region ionosphere in 2013 solar maximum observed from a low-latitude station

		Harmonic tweeks								Total
		1st	2nd	3rd	4th	5th	6th	7th	8th
Winter		828	3669	1844	727	228	72	38	8	7414
	%Count	11.17	49.49	24.87	9.81	3.08	0.97	0.51	0.11	100
Equinox		79	2281	3025	1580	1011	561	309	128	8974
	%Count	0.88	25.42	33.71	17.61	11.27	6.25	3.44	1.43	100
Summer		249	2511	4465	4595	3068	1395	727	292	17302
	%Count	1.44	14.51	25.81	26.56	17.73	8.06	4.20	1.69	100

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