‰  NOW 18 WPM transition file follows‰

At 2336 UTC on June 1, the Australian Space Weather Forecast Centre
issued a Geomagnetic Disturbance Warning for June 2, The solar wind
is expected to be influenced by a High Speed Solar Wind Stream over
the next 1 or 2 days. The source of this stream is a small coronal
hole centered over the equator. Geomagnetic activity may reach
active levels. June 2 geomagnetic conditions are expected to be
unsettled to active.  A new video from Dr. Tamitha Skov can be seen
on YouTube.  Average daily sunspot number for the recent reporting
week, May 25 to 31, was down from 31.7 to 15.6, compared to the
previous seven days. There were no sunspots on Tuesday, May 30, but
on May 31 sunspot region 2661 appeared, and the sunspot number was
11, the lowest non zero sunspot number possible, due to the arcane
method for counting sunspots. 10 is assigned for every sunspot
group, and 1 for each spot within that group. So a sunspot number of
11 means there was one sunspot region or group, with only one
sunspot.  At 0112 UTC on June 2, SpaceWeather.com issued this alert
regarding sunspot 2661, ACTIVE SUNSPOT.  On June 1st, a small but
surprisingly active sunspot rotated over the Suns eastern limb. In
less than 24 hours, it has unleashed nearly a dozen C class solar
flares and hurled a pair of CMEs into space, an impressive display
of fireworks. So far, none of the explosions have targeted Earth,
but this could change in the days ahead as the active region rotates
toward our planet. Visit Spaceweather.com for more information and
updates.  On June 1 the sunspot number rose from 11 to 18, which
means the number of sunspots increased from 1 to 8. The total area
of the sunspots doubled over those two days.  Average daily solar
flux increased from 74.1 to 77.2.  Average planetary A index
increased from 11 to 13.3, and average mid latitude A index went
from 11.7 to 10.6.  Predicted solar flux is 77 on June 2 and 3, 78
on June 4 to 8, 75 on June 9 and 10, 78 on June 11, 80 on June 12 to
21, 75 on June 22 and 23, 72, 78 and 72 on June 24 to 26, 70 on June
27 through July 5, 75 on July 6 and 7, 78 on July 8 and 80 on July 9
to 16.  Predicted planetary A index is 10, 15, and 8 on June 2 to 4,
5 on June 5 to 9, 10 and 12 on June 10 and 11, 8 on June 12 and 13,
then 10, 12, 25 and 10 on June 14 to 17, 8 on June 18 and 19, and
then 5 on June 20 to 24.  Next it is 12 on June 25, 5 on June 26 to
July 6, then 10 and 12 on July 7 and 8, 8 on July 9 and 10, then 10,
12, 25, and 10 on July 11 to 14 and 8 on July 15 and 16.  The latest
forecast from USAF Space Weather Squadron for ARRL Field Day
weekend, June 24 and 25, has solar flux on June 23 to 25 at 75, 72
and 78 and predicted planetary A index at 5, 5, and 12.  Both the
planetary A index forecast and solar flux prediction for Field Day
weekend has not changed since May 29.  On Sunday, May 28 during the
CW weekend of the CQ World Wide WPX contest there was a large
geomagnetic disturbance. Planetary A index was 51, and the High
Latitude College A index in Fairbanks, Alaska was 84. Those are both
huge numbers.  For more information concerning radio propagation,
see the ARRL Technical Information Service web page.  An detailed
explanation of the numbers used in this bulletin is also available
on this site.  An archive of past propagation bulletins is also
available.  Monthly propagation charts between four USA regions and
twelve overseas locations can be found on the W1AW web site.  Find
more good information and tutorials on propagation on the k9la web
site.  Sunspot numbers were 19, 22, 21, 20, 16, 0, and 11, with a
mean of 15.6. 10.7 cm flux was 76.1, 80.2, 81.9, 78.8, 75.8, 73.7,
and 74.1, with a mean of 77.2. Estimated planetary A indices were 4,
3, 14, 51, 10, 7, and 4, with a mean of 13.3.  Estimated mid
latitude A indices were 4, 3, 14, 32, 10, 6, and 5, with a mean of
10.6.

‰  END OF 18 WPM transition file ƒ