NICT Ionogram Browser

Ionogram Archives
(Click one of the dates, "From" or "To", then move to the required date on the browser screen)

Vertical sounding

Station	Source/Ionosonde type	From	To	Acquisition status and remarks
Wakkanai	Film scan	1951/07/14 20:00	1994/01/01 08:45	List , Format varies with the periods
Wakkanai	9B	1987/01/01 09:00	1993/12/31 23:15	List , Frequent data loss
Wakkanai	10A	1994/02/03 18:00	2003/01/31 10:45	List
Wakkanai	10C	2001/11/16 00:00	2009/02/04 14:45	List
Wakkanai(Sarobetsu)	10C	2009/02/10 11:00	Continued	List
Akita	Film scan	1952/11/15 09:10	1993/03/04 14:30	List , Format varies with the periods
Akita	9B	1987/12/05 00:00	1993/03/04 14:30	List , Frequent data loss , Closed in 1993
Kokubunji	Film scan	1950/12/14 18:00	1995/03/03 08:45	List , Format varies with the periods
Kokubunji	9B	1987/10/20 00:00	1993/12/31 23:45	List , Frequent data loss
Kokubunji	10A	1994/01/12 12:00	2002/05/13 14:30	List
Kokubunji	10C	2001/11/01 00:06	Continued	List
Yamagawa	Film scan	1951/09/11 09:00	1994/07/31 14:00	List , Format varies with the periods
Yamagawa	9B	1987/11/04 00:00	1993/12/31 23:45	List , Frequent data loss
Yamagawa	9B	1994/02/17 13:45	2001/08/07 13:15	List , Frequent data loss
Yamagawa	10C	2001/08/08 23:30	2001/11/15 23:45	List
Yamagawa	10C	2001/11/16 00:00	Continued	List
Okinawa	Film scan	1957/07/01 08:50	1994/04/01 08:45	List , Format varies with the periods
Okinawa	9B	1987/10/03 00:00	1993/12/31 23:15	List , Frequent data loss
Okinawa	10A	1993/12/31 23:30	2001/09/09 11:30	List
Okinawa(Ogimi)	10C	2001/09/10 17:00	2001/11/15 23:45	List
Okinawa(Ogimi)	10C	2001/11/16 00:00	Continued	List
Syowa(Antarctica)	Film scan	1959/04/07 18:15	1997/09/29 08:45	List
Syowa(Antarctica)	〜9B	1972/01/03 03:30	1978/12/01 14:15	List
Syowa(Antarctica)	10B	1997/02/03 11:30	2005/11/07 23:45	List , Observation starts at 0.5MHz
Syowa(Antarctica)	10C	2005/05/18 11:00	Continued	List
Soya(Shipboard)	Film scan	1959/11/02 07:45	1962/04/14 23:30	List

Oblique sounding

TX station	RX station	Ionosonde	From	To	Acquisition status and remarks
Wakkanai,Akita,Yamagawa,Okinawa	Kokubunji	Oblique sounder	1991/02/22 15:00	2001/02/27 14:45	List , Akita closed 1993
Kokubunji	Wakkanai	10C	2002/10/18 11:00	2009/02/04 14:45	List
Yamagawa	Wakkanai	10C	2002/10/18 11:00	2009/02/04 14:45	List
Okinawa(Ogimi)	Wakkanai	10C	2002/10/18 11:00	2009/02/04 14:45	List
Kokubunji	Wakkanai(Sarobetsu)	10C	2009/03/06 14:45	Continued	List
Yamagawa	Wakkanai(Sarobetsu)	10C	2009/03/06 14:45	Continued	List
Okinawa(Ogimi)	Wakkanai(Sarobetsu)	10C	2009/03/06 14:45	Continued	List
Wakkanai	Kokubunji	10C	2002/09/10 17:30	Continued	List
Yamagawa	Kokubunji	10C	2002/09/10 17:30	Continued	List
Okinawa(Ogimi)	Kokubunji	10C	2002/09/10 17:30	Continued	List
Wakkanai	Yamagawa	10C	2002/10/18 11:00	Continued	List
Kokubunji	Yamagawa	10C	2002/10/18 11:00	Continued	List
Okinawa(Ogimi)	Yamagawa	10C	2002/10/18 11:00	Continued	List
Wakkanai	Okinawa(Ogimi)	10C	2002/10/18 11:00	Continued	List
Kokubunji	Okinawa(Ogimi)	10C	2002/10/18 11:00	Continued	List
Yamagawa	Okinawa(Ogimi)	10C	2002/10/18 11:00	Continued	List