K7RA Propagation Bulletin #32 (updated on: 15/Aug/17)
SB PROP @ ARL $ARLP032 ARLP032 Propagation de K7RA ZCZC AP32 QST de W1AW Propagation Forecast Bulletin 32 ARLP032 From Tad Cook, K7RA Seattle, WA August 15, 2017 To all radio amateurs SB PROP ARL ARLP032 ARLP032 Propagation de K7RA Sorry for the long delay in getting this bulletin out, which normally occurs on Friday, but is now being released on the following Tuesday. This was the result of an automatic operating system update gone bad, which has me now actively considering open source alternatives. It still isn't fixed. Average daily sunspot numbers for the recent reporting week (August 3-9) rose 7.1 points to 12.1, and average daily solar flux rose from 71 to 73.2. Average daily planetary A index went from 5 to 11.3, and mid latitude A index rose from 6 to 10.9. Predicted solar flux for the near term is 74 on August 15-21, 72 on August 22, 68 on August 23-28, 70 on August 29, and 72 on August 30 through September 8. Predicted planetary A index is 5, 16, 26 and 20 on August 15-18, then 16, 14, 12, 10 and 6 on August 19-23, 5 on August 24-29, then 12, 24, 18 and 14 on August 30 through September 2, and 5 on September 3-8. W7WKR sent this: http://nyti.ms/2f4mpNH Max White sent this: http://bit.ly/2uUxsNm Ward Silver, N0AX and others reminded me that the upcoming HamSCI experiment this month in conjunction with the solar eclipse is not actually sponsored by the ARRL, but is a creation of HamSCI, Ham Radio Science Investigation. Check them out at, http://www.hamsci.org/ . If you would like to make a comment or have a tip for our readers, email the author at email@example.com. For more information concerning radio propagation, see 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 August 3 to 9, 2017 were 13, 13, 13, 13, 11, 11, and 11, with a mean of 5. 10.7 cm flux was 75.1, 74.1, 74.1, 73.5, 72.7, 71.1, and 71.5, with a mean of 71. Estimated planetary A indices were 12, 23, 16, 13, 5, 5, and 5, with a mean of 5. Estimated mid-latitude A indices were 11, 19, 17, 13, 6, 5, and 5, with a mean of 6.
We wish to thank K7RA for giving us permission to print this bulletin here.
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