Earth, Planets and Space

Table 2 Tweek occurrence in the pre-midnight and post-midnight periods

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
Pre-		573	4090	4407	3440	2177	1072	579	283	16621
midnight	% Count	3.45	24.61	26.51	20.70	13.10	6.45	3.48	1.70	100
Post-		583	4371	4927	3462	2130	956	495	145	17069
midnight	% Count	3.42	25.61	28.87	20.28	12.48	5.60	2.90	0.85	100

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