HF-Doppler(HFD) Project homepage

Supported by Sugadaira Space Radio Observatory, UEC
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The HF-doppler (HFD) method has long been used for observation of ionospheric disturbances because of its sensitivity and portability. This Project has started in 1999 for the following purposes: 1)To build a new transmitting station for HFD in place of the JJY station, 2)To develop a HFD observation network over Japan with high sensitivity and accuracy, 3)To make cooperative studies on ionospheric disturbances by means of HFD. The new HF Radio Station, JG2XA, was established at Chofu, Tokyo on July 3, 2001 by Sugadaira Space Radio Observatory of UEC, and it has continously been operated at 5006 and 8006 kHz for HFD. [since 2002/11/1]
HF-Doppler (HFD) Project News! Stop transmission is scheduled from 06:00JST to 20:00JST on September 5th.(2009/9/4) The HF Doppler News, No.31 and No.32 are presented.(2009/7/8)
HFD Observation data	Quick-Look data at Sugadaira, Oarai, Kakioka, Kashima, Shizuoka, Kyoto and Kure(daily update)
Information	Operation status of JG2XA(2009/1/6:updated) Locations of TX&RX stations(2004/5/17:updated) Characteristics of HFD Receivers(2004/5/14)
Prompt-analysis report	Solar Flare Effects on HF Signals(2006/1/4updated) Geomagnetic Effects on HF Signals(2006/1/4updated) Relationship between the uplink accessibility to Cubesat-Xi and geophysical conditions(ionsopheric, magnetic and HFD)(2003/7/20) Doppler-shift and intensity-decreases associated with the 2003/4/23 solar-flare event (2003/5/1)
About HFD Project	What is HF-Doppler (HFD) Project? List of HF-Doppler News(2006/2/23) Verification Card of JG2XA(2001/11/17) HFD-data copyright(2002/9/4) HFD References(2005/11/11updated) HFD-related-site links
Related projects(private-use only)	HFD project member only UEC-CRL Cooperation only UEC-GNSS-CRL Cooperation only

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