Table 2. Information on the precise locations of the stations and the types of data collected.

Station	GLAT. (N°)	GLON. (N°)	MLAT. (N°)	Data type
Wakkanai	45.2	141.8	37.4	Ionosonde foF2
I-Cheon	37.3	127.4.	28.3
Jeju	33.4	126.5	24.8
Yamagawa	31.2	130.6	22.5
Osan	37.1	127.1	28.2	GNSS VTEC
Usud	36.1	138.4	27.9
Mtka	35.7	139.5	27.6
Daej	36.4	127.4	27.4
KHB	47.6	134.7	41.4	Magnetometer N, E, Z components
MSR	44.4	142.3	37.6
CYG	36.4	126.8	29.9
KNY	31.4	130.9	24.5
GUA	13.6	126.8	5.64

GLAT, geographic latitude; GLON, geographic longitude; MLAT, magnetic latitude; GNSS, Global Navigation Satellite System; VTEC, vertical total electron content; KHB, Khabarovsk; MSR, Moshiri; CYG, Cheongyang; KNY, Kanoya; GUA, Guam.