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The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. ....
The K7RA Solar Update 04/23/2021 Tad Cook, K7RA, Seattle, reports: Four new sunspots emerged this week and were visible every day. Spaceweather.com issued a warning on April 22: “A CME is heading for Earth. and it could spark a geomagnetic storm when it arrives on April 25. NOAA forecasters say moderately strong G2-class storms are possible, which means auroras could dip into northern-tier US states from Maine to Washington.” Average daily sunspot number surged from 7 to 35.1, while average daily solar flux increased from 75 to 78. Due to seemingly constant solar wind, average planetary A index rose from 5.1 to 16.4, and average daily middle latitude A index went from 4.1 to 13. ....
2021 Propagation Summit Session Recordings Available 01/27/2021 YouTube recordings and PDF files from the 2021 Propagation Summit hosted on January 23 by Contest University are available. More than 1,000 logged in for the sessions. Each presentation begins approximately on the hour. You can advance the video to the presentation you wish to view. 11 AM – “Update on the Personal Space Weather Station Project and HamSCI Activities for 2021” by Dr. Nathaniel Frissell, W2NAF 12 Noon – “Solar Cycle 25 Predictions and Progress” by Carl Luetzelschwab, K9LA 1 PM – “Maximizing Performance of HF Antennas with Irregular Terrain” by Jim Breakall, WA3FET 2 PM – “HF Propagation: What to Expect During the Rising Years of Solar Cycle 25,” by Frank Donovan, W3LPL. ....