SB PROP @ ARL $ARLP024
ARLP024 Propagation de K7RA

ZCZC AP24
QST de W1AW
Propagation Forecast Bulletin 24  ARLP024
> From Tad Cook, K7RA
Seattle, WA  June 16, 2017
To all radio amateurs

SB PROP ARL ARLP024
ARLP024 Propagation de K7RA

At 2311 UTC on June 14 the Australian Space Weather Forecast Centre issued a
geomagnetic disturbance warning.  "In the second half of the first UT day (15
June) the solar wind is expected to be influenced by a High Speed Solar Wind
Stream.  On the second UT day (16 June) the speed can reach 700 km/s.  The
geomagnetic activity is expected to reach active levels.  Isolated minor storm
periods are possible on 16 June.

INCREASED GEOMAGNETIC ACTIVITY EXPECTED DUE TO CORONAL HOLE HIGH
SPEED WIND STREAM FROM 15-16 JUNE 2017.
GEOMAGNETIC ACTIVITY FORECAST
15 Jun: Unsettled to Active
16 Jun: Active"



Also, an update from Dr. Tamitha Skov: https://youtu.be/z795uEjCxYI

And an older video from Dr. Skov: https://www.youtube.com/watch?v=PYC6hzifWu0

We saw four zero sunspot days over the past week, so the average daily sunspot
number declined from 19.3 to 4.9 from the previous seven days.

Average daily solar flux for this reporting week (June 8 to 14) was 74.4, down
from 77.1 the previous seven days.  Average daily planetary A index increased
from 5.6 to 7.3 and average mid-latitude A index went from 5.6 to 6.9.  Yes,
that is correct and not a typo; over the previous reporting week (June 1 to 7),
 mid-latitude and planetary A index were both 5.6.

Predicted solar flux is 77 on June 16 to 23, 72 on June 24, 70 on June 25, 75
on June 26 through July 7, 78 on July 8, then 78, 77, 78, 76 and 74 on July 8
to 12, 72 on July 13 to 21, 70 on July 22 and 23, and 75 on July 24 to 30.

Predicted planetary A index is 25, 12, 10 and 8 on June 16 to 19, 5 on June 20
to July 8, then 15, 12, 8, 15, 25 and 15 on July 9 to 14, 12 on July 15 and 16,
 5 on July 17 to 30.

On June 14 Spaceweather.com issued a notification titled "A hole in the sun's
atmosphere".  It included a nice magnetic image.  Check out:

http://bit.ly/2t4LESL

Or go to Spaceweather.com and check for "A Hole in the sun's atmosphere" and if
 you don't see it, check the Archives in the upper right corner, and set the
date to June 14 or 15.  The magnetic image is quite nice and very "granular" as
 techies often say today.

"This is a coronal hole (CH), a region where the sun's magnetic field peels
back and allows solar wind to escape.  A fast-moving stream of solar wind from
this coronal hole is expected to arrive on June 16th, possibly sparking
G1-class geomagnetic storms. High-latitude sky watchers should be alert for
auroras, especially in the southern hemisphere where autumn darkness favors
visibility.

Forecasters note that this stream is unusually fast with wind speeds as high as
 700 km/s.  Moreover, it is threaded with "negative polarity" (south-pointing)
magnetic fields.  Such fields do a good job connecting to Earth's magnetosphere
 and energizing geomagnetic storms."



Jon Jones, N0JK wrote to me on June 14:

"Nice 6M Es opening from KS to Caribbean June 12.  Logged C6ATA and HH2AA til
2300z.  Seeing remarkable JT65 contacts spotted such as 9K2GS, VK4MA, VK8MS,
E51WL, and SV9CVY to North America on June 13 and 13."



ARRL Field Day is next weekend, June 24 and 25.  See
http://www.arrl.org/field-day for info.  The latest forecast for June 23 to 25
(we include the Friday before Field Day in case of any predicted geomagnetic
events on Friday) has changed from last week, with A index at 5 on all three
days and solar flux at 77, 72 and 70.

These predictions are updated daily, usually after 2100 UTC at
ftp://ftp.swpc.noaa.gov/pub/forecasts/45DF/ .



Check this out:

https://www.youtube.com/watch?v=zXN-MdoGM9g



From F. K. Janda, OK1HH of the Czech Propagation Interest Group, a geomagnetic
activity forecast for the period June 16 to July 11, 2017.

"Geomagnetic field will be:
Quiet on June 20 to 22, 27, July 1, 4 and 5, 7
Mostly quiet on June 26, 28, July 6
Quiet to unsettled June 18 and 19, 26, July 3
Quiet to active on June 17, 25, 29 and 30, July 2, 8, 11
Active to disturbed on June (16, 23 and 24,) July (9 and 10)

Amplifications of the solar wind from coronal holes are expected on June 16 to
19 (20, 26 and 27), July (8,) 9 to 11.  Parenthesis means lower probability of
activity enhancement and/or lower reliability of prediction."



This weekend is the CW portion of the All Asian DX Contest.  See
http://www.dxcoffee.com/eng/2017/this-weekend... and
http://www.dxzone.com/dx32720/all-asian-dx-co... for details.



Scott Avery, WA6LIE of Salinas, California wrote:

"The ARRL VHF contest pretty much fair to poor this year from California CM96.

Condx poor at best, so digital modes prevailed.  Was hit and miss on 6 meters
JT65 as band up and down a lot.

I missed about fifty percent heard due to band conditions.  Was trying to
encourage the new mode MSK144 for contest and general use, as a lot "quicker"
for those short openings I missed working on
JT65.

I use MSK144 here on 50.280 and we have very regular morning openings to SoCal
and AZ, NM and other places.

Saying that, keep an eye on the digital modes when conditions are poor.

My icing on the cake was working Hawaii on JT65; stations were KC7I, NH6Y and
K2GT.

Hope to see you on 6."



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 8 through 14, 2017 were 12, 0, 0, 0, 0, 11, and 11,
with a mean of 4.9. 10.7 cm flux was 74, 73.7, 74.7, 74.3, 75.2, 74.9, and
74.1, with a mean of 74.4.  Estimated planetary A indices were 4, 5, 4, 17, 8,
8, and 5, with a mean of 7.3. Estimated mid-latitude A indices were 5, 6, 5,
14, 6, 6, and 6, with a mean of 6.9.

NNNN
/EX

)\/(ark

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