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LATEST K7RA HF Propagation Bulletin


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


Friday, June 22, 2018 18:48 GMT


On Wednesday, June 20 http://www.spaceweather.com reported the sudden emergence of Sunspot AR2715. The sunspot number on that day shot up to 54, and it was 53 the next day. Average daily sunspot number for the reporting week (June 14-20) was 25.7, up from 4 the previous week. Average daily solar flux rose from 69.4 to 74. Solar flux was 82.1 on June 20. We have not seen numbers such as this since last September. This is good news just before ARRL Field Day, assuming the activity does not produce any geomagnetic disturbance. Predicted solar flux is 82 on June 22, 80 on June 23-24, 78 on June 25-28, 75 and 70 on June 29-30, 68 on July 1-6, 70 on July 7, 72 on July 8-13, 74 and 72 on July 14-15, 74 on July 16-20, 70 on July 21-27, 68 on July 28 through August 2, and 72 on August 3-5. Predicted planetary A index is 5 on June 22-23, then 12, 8, 5, 8, 20, 15 and 10 on June 24-30, 5 on July 1-14, 8 on July 15-16, 5 on July 17-20, 8 on July 21-22, then 5, 15, 28, 18 and 10 on July 23-27, and 5 on July 28 through August 5. We saw some heightened geomagnetic activity on Monday, June 18 UTC when the planetary K index rose to 5, and later in the day Alaska's College K index hit 6 over two of the eight 3-hour periods for the day. College A index was 33. Jeff Hartley, N8II of Shepherdstown West Virginia sent this report yesterday, June 21: "Today we are finally taking a breather from widespread sporadic-E openings to many different areas. The best 10M opening I have worked so far was on June 4 when I worked 72 European stations on SSB with best DX into Poland, Slovak Republic, and Greece (most EU stations ever worked by me in single Es opening). Quite a few were running 25W or less and I worked all of the UK countries except Jersey which was self-spotted, incredible! "On the morning of June 17, I heard about 15 Italian stations on 10M CW and SSB working the Italian 10M contest; none would stop long enough to answer my calls. But, after returning from the W3LPL open house, I started making QSOs for the WV QSO Party on 10M SSB and there was IT9ACN at 2207Z calling CQ in his contest and he was thrilled to work me; he and his Sicilian friend IT9BUN were both about S8 with QSB. I went on to work another IT9, IK7, and MM0TFU (weak) in Scotland along with 19 USA stations to the west and south. After a QSY to 15M, a station from northern Spain called in and quite a few EU stations were worked in the 2300 and 2400Z hours on 20M SSB along with many Es QSOs into all W4s (except VA/NC), OH, MI, all W9s, all W5s, and NY plus all New England states. "The party continued on 10M SSB on the June 17 working KW2W in VT at 1309Z and then on 15M CW, HV0A Vatican (first HV in over 1-1/2 years) via probable Es. Then back to 10M SSB double hop Es opened by 2333Z to Steve, WB2WIK in Los Angeles also working 2 other SOCAL stations, and on single hop QSOs with FL, KS, MO, IL, AL and MS. "On June 18 starting at 2039Z on 10M CW I found and worked F5NBX France, M0BKL England, and IK1ZOC Italy. Then starting 2215Z on 10 SSB I worked WP4PPV Puerto Rico, ME, and FL. "On June 19 starting 2024Z on 10 CW, I found HB9BKL Switzerland, M0BKL again, and was called by IU4FJI Italy. Then I switched to 10 SSB to work 2E0IQD, England and I5KAP in Florence. "June 20 featured very intense sporadic-E for many hours returning to 10M SSB at 0123Z putting K7CAR at a state park in UT, and another UT, CO, AZ, KY, MI and many 4s, 5s, 9s and 0s in the log. Almost all day long during the daytime into late evening there was widespread Es, but I was too busy until 2350Z to operate when I worked MN, NY grid FN13 (very unusual), VE3TM FN25, and MO on 6 meters. Then it was down to 10 SSB to work several southern VE3s, Eastern TN, western NC, MI, OH, TN, MI, MO, GA, and several other FL stations going QRT at 0120Z. I saw Midwest to EU QSOs reported on 6M around 2000Z." Mike Treister, W9NY of Chicago wrote: "Interesting about the increased sunspots. Have heard a lot of skip - few hundred miles - from all directions on 6 and 10 the past few days. Some pretty astounding signal strengths too. Nice to see so many on the air - lots of obvious new hams who have not previously worked 6 or 10 meter skip very excited with their QSOs. Almost more enjoyable listening than working the stations!" New report from Dr. Tamitha Skov: https://www.youtube.com/watch?v=BfIJ6ygBfwE& If you would like to make a comment or have a tip for our readers, email the author at, k7ra@arrl.net .