About IonosphereIonosonde Stations in Japan

Ionosonde Stations in Japan

Station	Actual observation start time (after 17:00 JST on 22 Apr 2003)	Geographic Latitude  (WGS-84)	Geographic Longitude  (WGS-84)	Magnetic Latitude  (IGRF-10(2005))	Magnetic Longitude  (IGRF-10(2005))
Wakkanai/Sarobetsu	timestamp -105 sec	45.16°N	141.75°E	36.4°N	208.9°E
Kokubunji	timestamp -30 sec	35.71°N	139.49°E	26.8°N	208.2°E
Yamagawa	timestamp +45 sec	31.20°N	130.62°E	21.7°N	200.5°E
Okinawa/Ogimi	timestamp +120 sec	26.68°N	128.15°E	17.0°N	198.6°E
Ionosonde Stations in the past
Station		Geographic Latitude  (WGS-84)	Geographic Longitude  (WGS-84)	Magnetic Latitude  (IGRF)	Magnetic Longitude  (IGRF)
Wakkanai		45.39°N	141.68°E	36.6°N	208.8°E
Okinawa		26.28°N  (Tokyo Datum)	127.81°E  (Tokyo Datum)
Akita		39.7250°N  (Tokyo Datum)	140.1333°E  (Tokyo Datum)

Actual observation start time

15:00 JST on 1 Jun. 2020 to present	Wakkanai/Sarobetsu	VIPIR2	timestamp - 40 sec
13:00 JST on 1 Jun. 2020 to present	Kokubunji	VIPIR2	timestamp + 0 sec
15:30 JST on 1 Jun. 2020 to present	Yamagawa	VIPIR2	timestamp + 40 sec
15:30 JST on 1 Jun. 2020 to present	Okinawa/Ogimi	VIPIR2	timestamp + 80 sec
00:00 JST on 13 May. 2016 to 14:45 JST on 1 Jun. 2020	Wakkanai/Sarobetsu	VIPIR2	timestamp - 75 sec
18:00 JST on 15 May. 2017 to 12:45 JST on 1 Jun. 2020	Kokubunji	VIPIR2	timestamp + 0 sec
15:00 JST on 10 May. 2017 to 15:15 JST on 1 Jun. 2020	Yamagawa	VIPIR2	timestamp + 75 sec
16:15 JST on 17 May. 2017 to 15:15 JST on 1 Jun. 2020	Okinawa/Ogimi	VIPIR2	timestamp + 150 sec
17:00 JST on 22 Apr. 2003 to 23:45 JST on 12 May. 2016	Wakkanai/Sarobetsu	10C	timestamp - 105 sec
17:00 JST on 22 Apr. 2003 to 17:45 JST on 15 May. 2017	Kokubunji	10C	timestamp - 30 sec
17:00 JST on 22 Apr. 2003 to 14:45 JST on 10 May. 2017	Yamagawa	10C	timestamp + 45 sec
17:00 JST on 22 Apr. 2003 to 16:00 JST on 17 May. 2017	Okinawa/Ogimi	10C	timestamp + 120 sec
14:15 JST on 15 Jan. 2003 to 16:45 JST on 22 Apr. 2003	Wakkanai	10A	timestamp - 60 sec
	Wakkanai	10C	timestamp - 105 sec
	Kokubunji	10A	timestamp + 0 sec
	Kokubunji	10C	timestamp - 30 sec
	Yamagawa	10A	timestamp + 60 sec
	Yamagawa	10C	timestamp + 45 sec
	Okinawa/Ogimi	10C	timestamp + 120 sec
16 Nov. 2001 to 14:00 JST on 15 Jan. 2003	Wakkanai	10A	timestamp - 60 sec
	Wakkanai	10C	timestamp - 90 sec
	Kokubunji	10A	timestamp + 0 sec
	Kokubunji	10C	timestamp - 30 sec
	Yamagawa	10C	timestamp + 30 sec
	Okinawa/Ogimi	10C	timestamp + 90 sec
1987 to 15 Nov. 2001	Wakkanai	9B/10A	timestamp - 60 sec
	Akita	9B	timestamp - 30 sec
	Kokubunji	9B/10A	timestamp + 0 sec
	Yamagawa	9B	timestamp + 30 sec
	Okinawa	9B/10A	timestamp + 90 sec

Great circle distance

Great circle distance (km)		Wakkanai	Wakkanai/ Sarobetsu	Kokubunji	Yamagawa	Okinawa /Ogimi
	Wakkanai			1092	1846	2403
	Wakkanai/ Sarobetsu			1068	1828	2385
	Kokubunji	1092	1068		963	1472
	Yamagawa	1846	1828	963		557
	Okinawa /Ogimi	2403	2385	1472	557