Observation Sites

The main transmitting (Tx) station is operated in Chofu, Tokyo, within the Chofu Campus of UEC (JG2XA). JG2XA transmits continuous waves with a power of 200 W at 5006 kHz and 8006 kHz. The station ID is transmitted every 5 minutes by an amplitude modulation of the carrier in morse code with the callsign JG2XA and its objective "UEC HFD STATION". The type of radio signal is H2A (amplitude modulation with coded tones by single sideband).

Operation log (transmission side only)

At some stations, we also observe (or observed in the past) signals of Radio Nikkei 1 (JOZ4 at 3925 kHz, JOZ2 at 6055 kHz, and JOZ3 at 9595 kHz) transmitted respectively from Nagara, Chiba (JOZ2/JOZ3) and from Nemuro, Hokkaido (JOZ4), Japan.




Receiving (Rx) Stations:
StationLocationFrequency (kHz)Period of Operation
NameIDGlat (N)Glon (E)CH#0CH#1CH#2CH#3Start DateEnd Date
SarobetsuSAR-D45.162141.7545006800660553925Nov 19, 2020
IitateIIT37.689140.67350068006June 1, 2014June 7, 2022
IitateIIT-D37.689140.6735006800660553925June 8, 2022
SugadairaSGD36.423138.3185006800660559595Oct 24, 2002
SugadairaSGD-D36.423138.3185006800660553925June 30, 2022
KakiokaKAK36.232140.1865006800660559595Feb 14, 2011Feb 5, 2018
OaraiORI36.331140.5875006800660559595May 18, 2004Sep 27, 2020
OaraiORI-D36.331140.5875006800660553925Sep 28, 2020
KashimaKSM35.953140.6635006800660559595Mar 9, 2004Oct 3, 2020
SugitoSGT36.042139.7085006800660559595Mar 30, 2014
ChibaCHB-D35.629140.1045006800660553925June 11, 2020
KisoKIS35.797137.6235006800660559595Mar 30, 2009May 6, 2011
ShimizuSMZ34.983 138.517 50068006May 17, 2004Sep 10, 2004
FujisawaFJS35.320139.4575006800660559595May 29, 2011June 20, 2020
FujisawaFJS-D35.320139.4575006800660553925Dec 18, 2020
KyotoKYO35.028135.7865006800660559595Feb 26, 2004Aug 3, 2016
AwajiAWJ34.293134.7365006800660559595Mar 14, 2019Dec 31, 2020
AwajiAWJ-D34.293134.7365006800660553925Jun 2, 2020Dec 8, 2022
KureKUR34.243132.52950068006Mar 24, 2003Jun 4, 2023
KureKUR-D34.243132.5295006800660553925Jun 5, 2023
KokuraKOK-D33.816130.8725006800660553925May 11, 2021
AsoASO32.885131.0076055800650009595Mar 13, 2009Apr 16, 2016
Onna1ON126.499127.8455006800660559595Nov 25, 2010May 19, 2017
Onna2ON226.499127.845500010000150003925Nov 25, 2010May 19, 2017
OnnaONA-D26.499127.8455006800660553925Jun 12, 2020

Note 1: At the Onna station in Okinawa, until May 2017, we had used two receivers (ON1 and ON2) to observe 8 frequencies in total at the same time.

Note 2: Old analogue Rx systems are being replaced with a new one based on the software-defined radio (USRP N210). Such digital Rx stations are given IDs like "AWJ-D" ("-D" has been added to the 3 letter code). A technical paper describing the analogue/digital receiving systems has been published.

Note 3: Operation of the Rx station in Kure is supported by Dr. Yamamoto at Japan Coast Guard Academy.

Note 4: Operation of the Rx station in Kyoto was supported by World Data Center for Geomagnetism, Kyoto University.

Note 5: Operation of the Rx station in Iitate has been supported by Planetary Plasma and Atmospheric Research Center (PPARC), Tohoku University.

Note 6: The operations of the Rx stations in Sarobetsu, Oarai, Onna are carried out in collaboration with National Institute of Information and Communications Technology (NICT).



        

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