Propagation

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September 4, 2016
Solar Cycle 24 is declining faster than expected! Get some DX if you can!

November 15th, 2015
Solar Cycle 24 is declining rapidly - Get some DX while it lasts!

Propagation Related

Communication with STEREO Behind satellite was lost Oct 1st , 2014 and has not been restored causing the NO DATA messages

behind_euvi_195_latest.jpg ahead_euvi_195_latest.jpg behind_cor1_latest.jpg ahead_cor1_latest.jpg


More Solar

  • Solar Cycle Progression
    • updated first of the every month
  • SpaceWeather.com
    • Current satellite information about all things related to the Sun's activity.
  • A surface distance calculator
    • website useful for knowing the distant to a DX contact.
    • The great-circle distance or orthodromic distance is the shortest distance between any two points on the surface of a sphere measured along a path on the surface of the sphere wikipedia
  • Maximum Usable Frequency (MUF) chart in near real-time.
    • It shows the daily progress of the Sun, the leading edge of evening twilight and the radio auroral zones near the North and South poles.
    • The chart is updated every 5 minutes.
    • A complete description and instructions on how to use the chart can be found spacew.com
  • Greyline chart from dx.qsl.net showing the line of sunlight to darkness in near-real time.
  • map of the ionosphere in near real-time provided by the Australian government. Useful for NVIS operation or "Cloud Burning".
  • Aurora Conditions from Edmonton
  • An explanation of Universal Time by the U.S. Naval Observatory.
  • An interesting historical chart showing sunspot numbers 1700-2000 from NOAA's National Geophysical Data Center (NGDC).
  • Maps for VHF Propagation for the technically curious

Fact of the Day




  • November 22nd, 2007 NOAA updates Solar Cycle Progression chart with predicted curves through 2016
  • October 28th, 2007 Quote form the K7RA Solar report:
    • Zero, zero, zero sunspots for 18 straight days now. A single sunspot appeared briefly October 6-7, no sunspots for four days prior, one sunspot for the final few days of September, and none for the three whole weeks prior to that.
  • October 14th, 2007 The Sun is blank again. No sunspots at all. The continuing low activity suggests by many forecasters to signal a moderate to moderate-weak next cycle.
  • September 21st, 2007 The K7RA Solar Update reports "...fifteen days in a row with no sunspots,but this may change soon."
    • Also of note from the update is a quote by "Bob Marston, K6TR, of Fremont, California, says, "If Cycle 23 continues through January 2008, it will match Cycle 20 as one of the longest in recent history. You have to go back to Cycle 9 in the mid-1800s to find a longer one. My own estimate is Cycle 23 will end in February 2008 with a SSN (smoothed, or average, sunspot number) between 6.8 and 7.2."
  • September 20th, 2007 Again there are no sunspots at all today. No Surprise...
  • September 9th, 2007 There are no sunspots on the surface of the sun at all. Not good for 11m propagation! Cycle 24 is about to start on its upward swing
  • May 6, 2007 Solar Cycle 24 Prediction from NOAA/NASA
  • February 25, 2007 No much to report for propagation on 11m due to being in the low spot of the 11-year sunspot cycle. All is quiet except for some very sporadic and brief DX.
  • December 28, 2006 "Sunspots 931 and 932 are fading away, leaving the sun blank and quiet." - Spaceweather.com
  • December 23rd, 2006 New large solar cycle predicted by NASA
  • December 19, 2006 There are no sunspots again on the Sun. The sunspot number is zero.
  • December 10, 2006 a major solar flare over the past few days has produced some good DX conditions today. Lots of activity mid-day.ARRL 10M contest is also running today.
  • November 25th, 2006 There are again no sunspots anywhere on the surface of the sun. Some DX is coming from the Southern Eastern U.S.
  • November 6th, 2006 an explosion on the Sun produced a strong burst of noise between 18-22Mhz. Other solar recordings are presented as well. Interesting web site that has recorded the sounds of the Sun.
  • October 17th,18th,19th,26th 2006 There are no sunspots at all on the entire surface of the sun today
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