High-latitude thermospheric wind study using a Fabry–Perot interferometer at Tromsø in Norway: averages and variations during quiet times

Earth, Planets and Space

Table 2 Baseline values of X component of magnetometer data at Tromsø

Year	Dusk (14-20 UT)	Midnight (20-2 UT)	Dawn (2-8 UT)	Date of the chosen value
2009	10,910.4	10,901.2	10,886.4	26 Jan 2009
2010	10,903.2	10,902.6	10,903.0	8 Feb 2010
2011	10,893.9	10,888.7	10,890.9	27 Jan 2011
2012	10,893.9^a	10,888.7^a	10,890.9^a	–
2013	10,847.3	10,846.4	10,850.1	4 Oct 2013
2014	10,852.4	10,849.9	10,850.1^a	13 Feb 2014
2015	10,852.4^a	10,849.9^a	10,850.1^a	–