10/26/2018 We saw no sunspots during the reporting week, October 18-24, so average daily sunspot number dropped from 12.6 to zero. The dearth of sunspots continued Thursday, October 25. Average daily solar flux declined from…
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SB PROP @ ARL $ARLP041 ARLP041 Propagation de K7RA ZCZC AP41 QST de W1AW Propagation Forecast Bulletin 41 ARLP041 From Tad Cook, K7RA Seattle, WA October 12, 2018 To all radio amateurs SB PROP ARL…
10/12/2018 Last week this bulletin reported a return of sunspot activity on September 29 after a 16-day absence from September 13-28, but the new activity only lasted six days. As of Thursday night (October 11)…
09/28/2018 The Sun remained spotless over the past week, and by September 27 the period with no sunspots was over two weeks. Average daily solar flux declined from 68.6 to 67.9. Average planetary A index…
06/23/2017 Average daily sunspot numbers rose this reporting week (June 15-21) from 4.9 to 29.4. The previous week had four days with no sunspots, and this week there were no zero sunspot days, hence the…
06/16/2017 At 2311 UTC on June 14 the Australian Space Weather Forecast Centre issued a geomagnetic disturbance warning: “In the second half of the first UT day (15 June) the solar wind is expected to…
SB PROP @ ARL $ARLP022 ARLP022 Propagation de K7RA ZCZC AP22 QST de W1AW Propagation Forecast Bulletin 22 ARLP022 From Tad Cook, K7RA Seattle, WA June 2, 2017 To all radio amateurs SB PROP ARL…
06/01/2017 The Sun’s 11-year magnetic cycle appears to be ending, but that won’t happen anytime soon. In a paper submitted on May 26 to the journal Solar Physics, two solar scientists are reinterpreting earlier evidence…
06/02/2017 At 2336 UTC on June 1, the Australian Space Weather Forecast Centre issued a Geomagnetic Disturbance Warning for June 2. “The solar wind is expected to be influenced by a High-Speed Solar Wind Stream…
05/26/2017 At 2344 UTC on May 23, the Australian Space Forecast Centre issued a geomagnetic disturbance warning for May 26-27. On May 26, they predict a minor to major storm warning and on May 27…
