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LATEST K7RA HF Propagation Bulletin


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


Friday, January 19, 2018 20:00 GMT


Compared to last week, average daily sunspot numbers declined from 11.9 to 7, but average daily solar flux went from 69.9 to 70.7. Seems counter-intuitive that sunspot and solar flux would move in opposite directions, but these are all very low numbers anyway, and any change is slight. Also, there are no sunspot numbers between 0 and 10 due to the arcane and somewhat confusing way they are counted. The number gets 10 points for each sunspot group, and one point for each sunspot in those groups. Therefore the minimum possible sunspot number if there is any sunspot activity is 11. Geomagnetic indicators were quiet, with average daily planetary A index moving from 5.4 to 6.1, and mid-latitude A index from 4.6 to 4.9. Predicted solar flux is 71 on January 19-25, 72 on January 26-27, 70 on January 28 to February 17, 72 on February 18-23, and 70 on February 24 to March 4. Predicted planetary A index is 8, 15, 12, 12, 10 and 8 on January 19-24, 5 on January 25-27, 10 on January 28, 5 on January 29 to February 3, 8 on February 4-5, 5 on February 6-8, then 8, 12 and 10 on February 9-11, 5 on February 12-14, 20 on February 15-16, 18 and 12 on February 17-18, 5 on February 19-23, 10 on February 24, 5 on February 25 to March 2, and 8 on March 3-4. Geomagnetic activity forecast for the period January 19 to February 14, 2018 from F.K. Janda, OK1HH and the Czech Propagation Interest Group. "Geomagnetic field will be: Quiet on January 19, 30-31, February 3, 6-8 Mostly quiet on February 2, 9 Quiet to unsettled on January 23-27, 29, February 1 Quiet to active on January 20-21, 28 Active to disturbed on January 22, February (4-5, 10) "Amplifications of the solar wind from coronal holes are expected on January 20-23, 28-31, February 5-6, (7, 9,) 10-12 "Remark: - Parenthesis means lower probability of activity enhancement. - Current forecasts are continuing to be less reliable." Interesting article about preserving a long running hand-drawn record of solar images: http://bit.ly/2DmPnUF For the latest from Dr. Tamitha Skov see: https://www.youtube.com/channel/UCkXjdDQ-db0xz8f4PKgKsag If you would like to make a comment or have a tip for our readers, email the author at, k7ra@arrl.net.