The Use of the Total Electron Content Measured by Navigation Satellites to Estimate Ionospheric Conditions

Table 1

Deviations of frequencies calculated according to the hyperbolic approximation from experimental values in April 2014.

1	2	3	4	5	6	7	8	9	10
station	,		IRI	Rec	Stat	Reg 2	Reg 4	Lat 1	Lat 2
Juliusruh	3295.5	f	0.73	0.41	0.43	0.68	0.67	1.03	0.57
Reg 2	273.2	d	1.44	0.52	0.49	0.67	0.68	1.07	0.64
Athens	5929.3	f	0.91	0.36	0.46	0.56	0.48	0.52	0.58
Reg 2	253.2	d	1.31	0.44	0.74	0.52	0.59	0.87	0.51
Grahams	3788.7	f	0.8	0.4	0.54	0.77	0.59	0.73	0.73
Lat 2	293.2	d	1.54	0.46	0.62	0.84	0.75	0.82	0.77
Longyear	4947.1	f	0.7	0.43	0.62	0.6	0.58	0.82	0.58
Lat 2	244.2	d	0.69	0.49	0.73	0.69	0.69	1.01	0.63
Thule	692.7	f	0.51	0.14	0.15	0.56	0.42	0.47	0.59
	437.6	d	0.55	0.1	0.13	0.51	0.46	0.64	0.54
Millstone	4864.4	f	0.9	0.5	0.47	0.48	0.46	0.67	0.49
Lat 1	265.4	d	1.38	0.67	0.67	0.65	0.81	0.81	0.8
Beijing	5402.8	f	1.17	0.49	0.61	0.61	0.58	0.7	0.62
Reg 4	263.9	d	1.99	0.42	0.64	0.45	0.51	0.84	0.45
Kokubunji	6176.7	f	1.29	0.47	0.65	0.61	0.69	0.85	0.62
Reg 4	228.4	d	2.11	0.55	0.66	0.56	0.7	0.96	0.56
Niue	4874.7	f	1.85	1.15	1.36	1.35	1.28	1.43	1.29
Reg 4	285	d	1.67	0.71	1	0.73	0.85	1.11	0.67
Cocos	5467.3	f	1.43	0.55	0.68	0.86	0.62	0.65	0.82
Lat 2	267.8	d	1.66	0.52	0.77	0.88	0.67	0.8	0.83
Mawson	1466.2	f	0.91	0.27	0.37	1	0.85	1.02	0.92
Lat 2	386.8	d	1.12	0.12	0.21	0.8	0.98	0.98	0.81