SB PROP @ ARL $ARLP016
ARLP016 Propagation de K7RA
ZCZC AP16
QST de
W1AW
Propagation Forecast Bulletin 16 ARLP016
From Tad Cook,
K7RA
Seattle, WA April 17, 2020
To all radio amateurs
SB PROP ARL
ARLP016
ARLP016 Propagation de K7RA
Sunspots are gone again. We are
at the bottom of the solar cycle,
so conditions should only get better.
There is an increase in
on-air activity due to the large number of people
staying at home
because of Covid-19, and this week we seem to be overwhelmed
with
reports of sporadic E openings.
The last observed sunspot
disappeared on April 5, so weekly average
daily sunspot numbers declined from
5.1 last week to zero this
reporting week, April 9 to 15. Average daily
solar flux went from
70.2 to 69.5.
Geomagnetic indicators remain
quiet as well, with average daily
estimated planetary A index going from 6.6
to 6.1, and mid-latitude
numbers, sourced from a single magnetometer in
Virginia, to 5 from
5.3.
Predicted solar flux is 69 on April 17 to
24, 70 on April 25 through
May 8, 68 on May 9 to 20, and 70 on May 21 to
31.
Predicted planetary A index is 8 on April 17 and 18, 12 and 8
on
April 19 and 20, 5 on April 21 to 25, 10 on April 26 and 27, 5 on
April
28 and 29, 8 on April 30, 5 on May 1 to 4, then 12, 5, 8 and 8
on May 5 to 8,
then 5 on May 9 to 11, 10 on May 12, 8 on May 13 to
16, 5 on May 17 to 22, 10
on May 23 and 24, then 5, 5 and 8 on May
25 to 27, and 5 on May 28 to
31.
Geomagnetic activity forecast for April 17 til May 12, 2020 from
F.
K. Janda, OK1HH:
"Geomagnetic field will be
Quiet on April 20
and 21, May 2 and 3, 6
Quiet to Unsettled on April 17 and 18, 22 to 24, 28
and 29
Quiet to Active on (April 25, May 1, 5, 7 to 9, 12)
Unsettled
to active on (April 19, 26 and 27, 30, May 4, 10 and 11)
Active to
Disturbed: Nothing.
Solar wind will intensify on April 17 to 19,
(20,) 26 to 28, May 4
to 6, 8 to 10
Remarks:
- Parenthesis
means lower probability of activity enhancement.
- The predictability of
changes remains lower as there are no
indicators."
HI8PLE wrote on
April 11 from Dominican Republic:
"E's season started very well here,
there has been a great activity
on 144 MHz in the Caribbean. On April 9 2140
UTC worked PJ2BR,
April 11 0027 UTC worked J69DS, at 1936 9Y4D, 9Z4DZ,
finally April
12 at 0113 YY5BRB, all QSO using FT8 with 16 ele beam and 150
watts.
I have noticed that the conditions with the Lesser Antilles
are
steady and last all day and night, then, at dusk some TEP activity
on
50 MHz with PY, LU, CE and CX.
It seems to me that this will be a good
E's season until June-July.
Take care and please stayhome. 73,
Edgar"
Danny Miller, KB8W (EN57) wrote:
"Yesterday, April 14,
2020 was the earliest Es/TEP activity that I
have ever experienced here in
EN57 (in the far NW corner of
Michigan's Upper Peninsula)."
"I have
been active for the past 10 years on 6 meters. I looked
back in my logs and
find that the first Es activity of the spring
season is usually in early May,
in 2019 my first contact was on May
10. But I have never even heard anyone
via Es in April of any year
(I have made contacts via meteor scatter in all
months of the
year)."
"6m opened for me at about 1710Z on April 14
when I copied CM2XM
(EL83) on 50.313 MHz using FT8. Over the next 10 hours I
worked 19
stations in New England, the Gulf coast and
Cuba."
"According to PSKReporter, I was heard at 2202Z by TI2CDA (EJ79)
and
at 2201Z by HK4GSO (FJ26), those are the first TEP receptions that
I
have experienced. I was still hearing signals when I turned off
the
radio and went to bed at about 0400Z April 15."
"For me, a
remarkable day as I run only 50 W to a 5 element Yagi."
AA8WH writes
from Michigan, "Starting April 14 at about 2246 UTC, 6
meters was open on
FT8. I worked NK4DX, in Ft. Lauderdale. When 6
died down, I moved down to
12 meters, and worked KN4NN in
Crawfordville FL, W9OO in Harvey, IL. I then
moved up to 10 meters
and worked WZ9B in Noble IL, N4UXP in Atlanta GA, NT4J
in Fuquay
Varina NC, AB0S in Beloit KS.
At 0324 UTC, signal strengths
were up to s-7 on the peaks, N5LFA in
Potts Camp MS, WB4HMA in Nashville TN,
N4JRS in Oakwood GA, J68HZ on
St. Lucia.
10 meters continued to stay
open well past 0400 UTC."
Lance Collister, W7JG wrote from Frenchtown,
Montana:
"April 15 was the best 6m activity I have ever seen this early
in
the season. Unlike the eastern half of the country, out here
in
western Montana we normally are one or two hops away from linking
into
any high TEC activity and/or TEP propagation. Usually it seems
a higher Kp
index is required to cause 6m Es openings to the south
from up here. But
perhaps because the Kp index had been up to 3 on
both April 14 and early on
April 15 plus the time of year had
something to do with it. Anyway, the 6m
band was open from here in
western Montana to the southeast for 9 hours, and
I worked my first
HC (Ecuador) station since I got on 6m 24 years ago. In
addition to
many domestic contacts, these DX stations were all worked on
50.313
using FT8 mode: XE1KK, XE1K, XE1EE, XE1H, TI2CDA,TG9AJR,
TG9ANF,
HP2DFA, HK3PJ, HC2DR, HC5VF, HC2AO, OA4DOS, LW2DAF, LU5CQC,
LU2DPW,
and CX6DRA."
"Normally up here, we wouldn't think a big Es
opening before the end
of May was possible! I am sure it helped that so many
people were
sequestered at home during the pandemic and able to be by
their
radios! This may be a once in a lifetime event, but it sure
was
memorable! Looking forward to the great 6m EME condx at the end
of
this month to pick up another ATNO on 6m."
Check out Lance's web
page at http://www.bigskyspaces.com/w7gj/
Dave
Bono, K6OAK of Fremont, California wrote, "We are in the middle
of week 5 of
Stay at Home restrictions here in the S.F. Bay Area. I
thought I would use
the opportunity of being home to make some
improvements to my 6BTV ground
mounted antenna. So I checked all my
cable connections and added two 33 foot
and a few shorter ground
radials. Then I went into the shack shortly after
2200Z and fired
up the Kenwood 590SG to see if there was any improvement.
Listening
to FT-8 there were signals on all bands 6 to 40M! Wow what
a
difference. I worked a bunch on 10M in short order at under 30
watts.
I wish I could say it was the radials, but I'm sure it was
just a coincidence
that the bands opened up after being very stingy
for the prior few days and
weeks!"
Mike, W9NY operates from the top of a tall building in
Chicago.
"To my surprise 10 meters and 6 meters were full of stations
coming
in to Chicago the evenings of April 14 and 15. Using
a
non-directional poorly matched antenna (G5RV for 20 meters up 450
feet)
with 100 watts on SSB I worked several stations around the USA
on 10 and some
on 6 meters including Mexico. Can't wait for those
sunspots!"
WB5AGZ
wrote:
There was a whopper of an opening to Oklahoma on Tuesday April
14
from around 16:30 Central Daylight time until it all faded out
near
Midnight. As heard from a discone about 50 FT above the
ground,
signals on 10 meters from the East Coast of the US rolled in
from
the New York City Area down to North Carolina with lots of
different
signals fading in and out over each other which is
quintessential
Sporadic E behavior.
It all appears to have started
rather suddenly at about 16:45 local
time. The scanner was hearing business
and public safety signals
from local sources and then W4BWW in East Tennessee
came in out of
the blue talking to a station in Kansas which was inaudible
from
here, here being about 60 miles South of the Oklahoma/Kansas
border.
That exchange was probably on 29.6 as it was simplex. The
next
signal was a piece of a repeater ID in North Carolina in which
all
one could hear was a female voice saying "North Carolina at the end
of
the ID. In a later fade-in, that turned out to be WB4BVA in
Wilksborough,
North Carolina.
After that, it was crazy-town on steroids. There was a
MCW ID for a
repeater in the 3rd or 4th call area that was too mutilated to
read
which later turned out to be N3AUY MD PL 4A when it faded in again.
I
cheated and replayed the recording several times before I could
copy the CW
properly.
I am not used to a PL tone of 4A but that is what it sent.
It's
obviously in Maryland.
One of the signals in for a good portion
of the evening was the
WA3PBD repeater in Pitsburg, PA. It's full MCW ID is
WA3PBD/R PGH
and it's signal was present though occasionally blotted out
by
temporarily stronger signals from other repeaters before coming
back
in. Another briefly-heard system was the KD2WA repeater whose
voice
ID gives the PL tone as 110.9 Hz in a synthesized male voice.
I
did possibly hear a Florida station but am not sure if I actually
heard him
on simplex or he was hitting one of the repeaters. The
scanner is set to
scan 29.6 through 29.680 in 20 KHZ steps and the
band opening was good enough
to make this a very chaotic experience.
Newcomers to amateur radio who
heard this opening got to hear what
10 FM was like in previous sunspot maxima
even though this is the
bottom of the barrel for solar
activity.
Also, what anybody hearing all this chaos may not realize is
that
there was once a time in which the 30 to 50 MHZ band was
the
work-a-day band for business and public safety communications in
the
Americas. The incredible Sun spot cycle of 1958 meant that
hundreds
of cities and small towns alike would jam each other's radio
systems
with full-quieting foreign traffic or "skip" as they tried to
do
routine business. The Boston Fire Department was full quieting
in
Oklahoma and surrounding states on 33.77 MHZ on just about any
Winter
day during Solar peaks.
Those openings spurred the mass moves to the 150
to 174 and up radio
bands where most mobile business and emergency services
now live.
This is the kind of thing that can hook people in to amateur
radio
for life."
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
http://www.arrl.org/propagation and
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-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 April 9 through 15, 2020 were 0, 0, 0, 0, 0, 0,
and 0, with a
mean of 0. 10.7 cm flux was 70.3, 69.2, 70.6, 70.8,
70.3, 68.9, and 68.4,
with a mean of 69.5. Estimated planetary A
indices were 5, 5, 6, 7, 5, 8,
and 7, with a mean of 6.1. Middle
latitude A index was 5, 4, 4, 5, 4, 7, and
6, with a mean of 5.
NNNN
/EX
