HFD homepage

update: 2009/9/4

• 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)
  

• The 5006kHz transmission is restarted on November 17, 2008.(2008/11/17)
  
• The 5006kHz transmission is stopped from October 20, 2008 due to the TX maintainance.(2008/10/22)
  
• The 8006kHz transmission is restarted on October 20, 2008.(2008/10/22)
  
• The 8006kHz transmission are continuously stopped since September 18, 2008 due to the TX trouble.(2008/9/20)
  
• Stop transmissions of 8006kHz were frequently made from September 2nd to September 17th due to the TX trouble.(2008/9/20)
  
• Stop transmission is scheduled from 20:00JST on September 5th to 10:00JST on September 9th(2008/8/27)
  
• Stop transmission from 12:45 to 17:15JST on June 8(2008/6/9)
  
• Stop transmission from Jan. 29th to 30th(2008/1/31)
  
• The frequency stability was degraded from Jan. 26th to 29th.(2008/1/31)
  

• The HF Doppler News, No.30, is published on March 15, 2007.(2007/3/20)
  

• Stop transmission is scheduled from September 1to 2 due to AC-power stop(2006/8/28)
  
• The HF Doppler News, No.29, is published on February 20, 2006.(2006/2/23)
  
• The HFD homepage is renewed for the year 2006. (2006/1/4)
  

• The power-down operation of 5006kHz was made from September 29 to 30 due to the TX trouble.(2005/10/2)
  
• Stop transmission is scheduled from September 3 to 5 due to AC-power stop(2005/8/31)
  
• The HFD Kakioka Station is set up in the Kakioka Magnetic Observatory, JMA on Aug. 17, 2005.(2005/8/21)
  
• The HF Doppler News, No.28, is published on March 15, 2005.(2005/3/17)
  
• The ministry of Internal Affairs and Communications will have the second round session on the problems of Power Line Communication (PLC) Systems from this January.(2005/2/5)(in Japanese)
  
• The JG2XA transmission status is updated for the year 2005.(2005/2/5)
  

• The number of HFD homepage accesses exceeded 10,000 on November 13, 2004.(2004/11/13)
  
• JG2XA transmission stopped from 19 to 21 JST on Octorber 25 due to maintainance.(2004/10/25)
  
• JG2XA transmission will stop from 19 to 20 JST on Octorber 25 due to maintainance.(2004/10/20)
  
• JG2XA transmission was paused from September 3 to 6 due to AC-power stop.(2004/9/6)
  
• Stop transmission is scheduled from September 3 to 6 due to AC-power stop(2004/9/3 rescheduled)
  
• Compilation of Geomagnetic Effects on HF Signals is added.(2004/9/2)
  
• Stop transmission is scheduled from September 4 to 6 due to AC-power stop(2004/7/26)
  
• Stop transmission on July 26 due to AC-power failure(2004/7/26)
  
• Stop transmission on July 15 due to maintainance work of the TX antennas(2004/7/16)
  
• Stop transmission from May 28 to 29 due to construction work close to the TX antenna(2004/5/28)
  
• HFD Shizuoka Station is set up in the Shimizu Campus of Tokai University on May 17, 2004.(2004/5/17)
  
• Locations of TX&RX stations(2004/5/17 updated)
  
• Characteristics of HFD Receivers(2004/3/13; 2004/5/14 revised)
  
• HFD Kashima Station is set up in KSRC on March 9, 2004.(2004/3/10)
  
• HFD Kyoto Station is set up in KUGI on February 26, 2004.(2004/2/28)
  
• The HF Doppler News, No.27, is published on March 21, 2004.(2004/2/28)
  

• Report: The HFD TX-station JG2XA made a modified opetation from December 18 to 24, 2003.(2003/12/25)
  
• JG2XA has moved to the highest building in the UEC campus on December 18, 2003.(2003/12/25)
  
• NOTICE: The HFD TX-station JG2XA will make a modified opetation from December 18 to 24, 2003.(2003/12/16)
  
• NOTICE: The HFD TX-station JG2XA will make a short stop during the last week of November.(2003/11/21)
  
• JG2XA will stop from 0750JST on Sep. 6, 2003 to 0130JST on Sep. 8, 2003 due to AC power stop.(2003/9/5)
  
• Automatic data upload from the Oarai RX site started on Aug. 20, 2003(2003/8/21)
  
• Relationship between the uplink accessibility to Cubesat-Xi and geophysical conditions (ionsopheric, magnetic and HFD)(2003/7/20)
  
• Report on the near-by field strength around the Chofu TX site (summary)(2003/7/26)
  
• Report on the near-by field strength around the Chofu TX site(2003/7/25 revised)
  
• English homepage starts!(2003/7/15)
  
• Add 5 and 10 MHz receivers to the Sugadaira RX site and data are available from June 27, 2003(2003/7/13)
  
• Automatic data upload from the Kure RX site started on June 19, 2002(2003/6/22)
  
• Report on the near-by field strength around the Chofu TX site (indoor part)(2003/6/23)
  
• Automatic data upload from the Kure RX site started on June 19, 2003(2003/6/22)
  
• Report on the near-by field strength around the Chofu TX site (photos)(2003/6/22)
  
• Report on the near-by field strength around the Chofu TX site (outdoor part)(2002/6/21)
  
• The system used for measuring the near-by field strength around the Chofu TX site(2002/6/12)
  
• Add the UEC-related HFD references to HFD references as an indepent grouping(2003/6/8)
  
• Doppler-shift and intensity-decreases associated with the 2003/4/23 solar-flare event (2003/5/1)
  
• Re-start the 5006kHz transmission on April 14, 2003(2003/4/14)
  
• HF Doppler Observation Report[Sugadaira](2003/4/9: New data added)
  
• A new HFD Observation site is established in Kure on March 24, 2003.(2003/3/31)
  
• JG2XA5006kHz stop due to TX failure from March 29, 2003.(2003/3/29-)
  
• The HF Doppler News, No.26, is issued on March 19, 2003.(2003/2/29)
  
• HF Doppler Observation Report[Sugadaira](2003/3/17: New data added)
  
• Report on the electromagnetic field intensity around JG2TX antenna.(2002/2/15)
  
• HF Doppler Observation Report[Sugadaira](2003/2/5: New data added)
  
• HFD Observation Site List(2003/1/28: renew)
  
• Number of toppage aceesses passed 1000(2003/1/28)
  
• HF Doppler Observation Report[Sugadaira](2003/1/15: New data added)
  
• Test observation report of the new frequency receiver at Sugadaira(2002/1/15)
  

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