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LATEST K7RA HF Propagation Bulletin


From Tad Cook, K7RA
Seattle, Washington, USA
To all Amateur Radio Operators


Friday, April 28, 2017 13:42 GMT


Each of the average solar and geomagnetic indices rose last week (April 20-26) over the previous seven days. Average daily sunspot number rose from 8.6 to 35.7, and solar flux rose from 76.5 to 81.4. Average daily planetary A index went from 8 to 26.4, and average daily mid-latitude A index from 6.3 to 18.4. The day with the most geomagnetic activity was April 22 when the planetary A index was 54. One the same date, Alaska's College A index (near Fairbanks) was 86. Predicted planetary A index is 8, 5 and 5 on April 28-30, then 14, 10, 8 and 10 on May 1-4, 15 on May 5-6, 8 on May 7-8, 5 on May 9-14, 8 and 15 on May 15-16, and then into a more active period at 30, 25, 45, 50 and 30 on May 17-21. Then 20 on May 22-24, then 15, 8, 5 and 20 on May 25-28, 10 on May 29-31, 15 on June 1-2, 8 on June 3-4, and 5 on June 5-9. Predicted solar flux values are 79 on April 28-29, 78 on April 30 and May 1, 77 on May 2-4, 75 on May 5-14, 80 on May 15-18, 85 on May 19-24, 80 on May 25-28 and 75 on May 29 to June 10. OK1HH sent us this geomagnetic activity forecast for the period April 28 to May 24, 2017. "Geomagnetic field will be: Quiet on May 9-10, 12-13 Mostly quiet on April 30, May 7 Quiet to unsettled April 29, May 2, 4, 14, 21-24 Quiet to active on April 28, May 1, 3, 8, 11, 15-16, 19 Active to disturbed on May (5-6,) 17-18, 20 "Amplifications of the solar wind from coronal holes are expected on April 28, May (1-5,) 6-8, (9-11,) 18-22 "Remark: - Parenthesis means lower probability of activity enhancement and/or lower reliability of prediction." I thought I ran this last week, but apparently not: https://www.youtube.com/watch?v=JR7D9zTygao These always seem to come out after the bulletin is posted. You might want to check this for more up-to-date videos from Dr. Tamitha Skov: https://www.youtube.com/user/SpWxfx/videos Thanks to Don, N5DM for that tip. If you would like to make a comment or have a tip for our readers, email the author at k7ra@arrl.net.