ARRL

• The ARRL Solar Update

  Solar flare activity is expected to remain at very low levels, with a
  chance for isolated C-class flares through September 19, according to
  NOAA's Space Weather Prediction Center (SWPC). Solar wind speed was
  steady near 530 km/s, and negative polarity CH HSS (coronal hole
  high-speed stream) effects are anticipated to persist through September
  18, with additional enhancements likely today due to flan...

• Get Ready for Jamboree on the Air

• Contest University Celebrates 100 Years of Yagis

  The Yagi-Uda beam antenna was invented 100 years ago, in 1926, and Contest University (CTU) is celebrating its centennial with a live Zoom webinar this Saturday, September 19, 2026, at 1600 UTC (noon Eastern). The free webinar, titled “The Yagi Turns 100,” will be available online at https://w3lif.org/yagi. There is no pre-registration. Click on the link before 1600 Zulu on Saturday to watch. Q...

• The ARRL Solar Update

  Solar flare activity was at low levels in the past week with
  isolated C-class flare activity, according to NOAA’s Space Weather
  Prediction Center. The largest flare of the period was a C3.4 on
  September 8 from otherwise stable Region 4528. Region 4530 developed
  asymmetric penumbra on both its leading and trailing poles while
  undergoing consolidation in its intermediate area. New flux
  emergence in the...

• Special HAARP Transmission for 9/11

  To commemorate the 25th anniversary of the September 11, 2001 attacks on the United States, the High-frequency Active Auroral Research Program (HAARP) at the University of Alaska Fairbanks will be making a special transmission on 9.11 MHz at 0030-0035 UTC on September 12, 2026 (8:30-8:35 PM eastern time Friday evening). The transmission will consist of a Morse code QST, followed by a slow-scan...