ARRL
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:
Max White
sent this:
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,
If you would
like to make a comment or have a tip for our readers,
email the
author at k7ra@arrl.net.
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
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.
NNNN
/EX