SB PROP @ ARL $ARLP027
ARLP027 Propagation de K7RA

ZCZC AP27
QST de W1AW
Propagation Forecast Bulletin 27  ARLP027
> From Tad Cook, K7RA
Seattle, WA  July 7, 2017
To all radio amateurs

SB PROP ARL ARLP027
ARLP027 Propagation de K7RA

At 0057 UTC on July 7 the Australian Space Forecast Centre issued a Geomagnetic
 Disturbance Warning: "Expect an increase in geomagnetic activity late on UT
day, 08 to 09 July due to influence of geoeffective coronal hole."

Our sun showed no sunspots on July 3 and 4, so average daily sunspot numbers
dropped from 20.3 on June 22 to 28 to 8 during the current reporting week, June
 29 through July 5.  Average daily solar flux went from 73.6 to 71.7.

Average daily planetary A index went from 6.9 to 7.1 and average mid-latitude A
 index went from 7.4 to 8.3, barely any change.

Predicted solar flux is 76 on July 7, 78 on July 8 to 13, 75 on July 14, 71 on
July 15, 72 on July 16 to 19, 71 on July 20 to 27, 70 on July 28 through August
 2, 71 on August 3 to 11, 72 on August 12 to 15 and 71 on August 16 to 20.

Predicted planetary A index is 5 on July 7, then 8, 25, 18 and 12 on July 8 to
11, then 8, 5, 13 and 11 on July 12 to 15, 5 on July 16 to 20, 11 on July 21
and 22, 5 on July 23 to 31, 7 on August 1 and 2, 5 on August 3 to 8, then 23,
13 and 11 on August 9 to 11, 5 on August 12 to 16, 11 on August 17 and 18 and 5
 on August 19 and 20.



F. K. Janda, OK1HH of the Czech Propagation Interest Group sent this
geomagnetic activity forecast for the period July 7 to August 3, 2017.

"Geomagnetic field will be:
Quiet on July 11, 18, 25 and 26, August 1
Mostly quiet on July 7, 17, 19 to 21, 24, 29 to 31
Quiet to unsettled July 9 and 10, 16, August 2 and 3
Quiet to active on July 8, 12 and 13, 15, 22 and 23, 27
Active to disturbed on July 14, 28

Amplifications of the solar wind from coronal holes are expected on July (8,) 9
 to 12, 14 to 17, (18, 21,) 22 to 24, (25,) 30 and 31

Remarks:  Parenthesis means lower probability of activity enhancement and/or
lower reliability of prediction."



Max White, M0VNG of Worcester, England sent this very interesting space weather
 audio dispatch from the UK Met Office:

http://www.metoffice.gov.uk/learning/mostly-w...



Check this:

https://www.space.com/37330-solar-minimum-cor...



And finally, Dick Bingham, W7WKR who lives way off the grid, "1.2 miles up
Company Creek Road" near Stehekin, Washington (check his QRZ.com listing) sent
this off-topic but fascinating piece about an ancient computer.

http://wapo.st/2sU76Zx

I've heard about this artifact before, but never in such detail.



For more information concerning radio propagation, see the ARRL Technical
Information Service 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-ionosph...

An archive of past propagation bulletins is at
http://arrl.org/w1aw-bulletins-archive-propag...  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 June 29 through July 5, 2017 were 12, 11, 11, 11, 0, 0, and
 11, with a mean of 8. 10.7 cm flux was 71.8, 71.5, 70.7, 71.2, 71.7, 71.8, and
 73, with a mean of 71.7.  Estimated planetary A indices were 5, 4, 11, 18, 5,
4, and 3, with a mean of 7.1. Estimated mid-latitude A indices were 6, 4, 14,
20, 7, 5, and 2, with a mean of 8.3.

NNNN
/EX

)\/(ark

Always Mount a Scratch Monkey
Do you manage your own servers? If you are not running an IDS/IPS yer doin' it
wrong...
... BUFFET: A French word that means "Get up and get it yourself!"
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