Welcome to Big Island ARRL News.
Top Story: Today’s post focuses on the latest ARRL Propagation Bulletin (ARLP009-2020).
Views expressed in this Amateur/Ham Radio propagation report are those of Tad Cook (K7RA) and his volunteer staff of observers and reporters.
Content supplied by HQ ARRL, 225 Main Street, Newington, CT, 06111.
Accessed on 29 Februrary 2020, 0300 UTC, Post 1332.
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SB PROP @ ARL $ARLP009 ARLP009 Propagation de K7RA ZCZC AP09 QST de W1AW Propagation Forecast Bulletin 9 ARLP009 From Tad Cook, K7RA Seattle, WA February 28, 2020 To all radio amateurs SB PROP ARL ARLP009 ARLP009 Propagation de K7RA Still no sunspots through all of February, except for the first day of the month. I keep watching for possible sunspot activity over the solar horizon on https://stereo.gsfc.nasa.gov/ . Recently I noticed a promising looking white area, and in the past few days at Spaceweather.com they pointed out two new regions just over the horizon. As of Thursday night, both areas still appear to be transitioning over the horizon at -90 degrees shown on the STEREO monitor at the above URL. But so far nothing in the daily 45 day forecast of solar flux shows any associated increase related to this. Average daily solar flux changed slightly from 70.9 to 70.5 over the recent week, and geomagnetic indicators remained quiet. Predicted solar flux over the next 45 days is 70 on February 28 through March 3, and 71 on March 4 through April 12. Predicted planetary A index is 5 on February 28 through March 3, then 12, 12 and 8 on March 4-6, 5 on March 7-14, then 10, 8, 10, 8, 5, 10 and 8 on March 15-21, then 5, 8, 12 and 10 on March 22-25, 5 on March 26-30, then 20, 15 and 8 on March 31 through April 2, then 5 on April 3-12. Geomagnetic activity forecast for the period February 28 to March 25, 2020 from F.K. Janda, OK1HH. "Geomagnetic field will be quiet on: March 11-14 quiet to unsettled on: March 1-3, 15, 18, 21, 23-25 quiet to active on: February (28-29), March 7-10, 19-20, 22 unsettled to active on: March 4-6, 16-17 active to disturbed: NONE! "Solar wind will intensify on: February (28 -29), March 5-7, (17-22). "Parenthesis means lower probability of activity enhancement." Interesting article about the Kodaikanal observatory in India with some nice butterfly diagrams and charts of daily sunspot area: https://bit.ly/39dyFD6 Next weekend the Apache Point Observatory in Sunspot, New Mexico hosts an open house: https://bit.ly/2I53GwO Solar activity and whale navigation: https://bit.ly/2Pw3KtK And the New York Times weighs in: https://www.nytimes.com/2020/02/25/science/whales-sunspots.html Mike Schaffer, KA3JAW in Easton, PA monitors 11 meters for evidence of sporadic-E skip. On Monday, February 24 he reports: "Sporadic-E lasted for nearly three hours - 9:58 am (1458 UTC) to 12:49 pm (1749 UTC). "At first, stations were coming from the west with the states: IL, IN, OH. "Chicago, IL at 650 air miles being the furthest. "Half-way into the activity, around 11:33 am (1633 UTC) sporadic-E changed directions toward the south with the states: MS, FL, GA, TN, KY. "Jackson, MS at 1013 air miles being the furthest." If you would like to make a comment or have a tip for our readers, email the author at, firstname.lastname@example.org. For more information concerning radio propagation, see http://www.arrl.org/propagation and the ARRL Technical Information Service web page at, http://arrl.org/propagation-of-rf-signals. For an explanation of numbers used in this bulletin, see http://arrl.org/the-sun-the-earth-the-ionosphere. An archive of past propagation bulletins is at http://arrl.org/w1aw-bulletins-archive-propagation. More good information and tutorials on propagation are at http://k9la.us/. Monthly propagation charts between four USA regions and twelve overseas locations are at http://arrl.org/propagation. Instructions for starting or ending email distribution of ARRL bulletins are at http://arrl.org/bulletins. Sunspot numbers for February 20 through 26, 2020 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. 10.7 cm flux was 70.8, 71.2, 70.2, 70.1, 70.2, 70.6, and 70.1, with a mean of 70.5. Estimated planetary A indices were 8, 14, 9, 5, 4, 3, and 4, with a mean of 6.7. Middle latitude A index was 5, 10, 7, 4, 3, 3, and 3, with a mean of 5. NNNN /EX