ARRL

Register Account

Login Help

ARRL Propagation Bulletin ARLP016 (2005)

This is a multi-part message in MIME format.

------=_NextPart_000_0005_01C549AD.E9773240
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

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 22, 2005
To all radio amateurs 

SB PROP ARL ARLP016
ARLP016 Propagation de K7RA

Little changed in sunspots and solar flux this week, but it was one
of those periods were average daily sunspot numbers were up
slightly, and average daily solar flux was down a little.  Average
daily sunspot numbers were up over ten points to 50.9, and average
daily solar flux was down five points to 81.9.

Geomagnetic conditions were calmer and quieter, with no really
stormy days at all.  The most unsettled days saw planetary A index
of 19 for April 14, while the mid-latitude A index was 14.  On April
20 the planetary A index was 21 and the mid-latitude A index was 12.

No large sunspots are detected on the sun's far side, and the
projection for the next week is for more of the same in terms of
solar flux and sunspot numbers.  April 25-28 could see a slight rise
in sunspot count.  April 22-23 could produce some unsettled
geomagnetic conditions if the interplanetary magnetic field turns
south.  Currently as this bulletin is written early Friday, the
field points north, tending to deflect any solar wind.  While there
isn't much in the way of sunspots, at least conditions are quiet and
there is more sunlight for those of us in the Northern Hemisphere.

Randy Crews, W7TJ of Spokane, Washington sent a note in response to
last week's bulletin mentioning 160 meter propagation.  He writes,
''Here is one of the best articles on 160M Propagation I have read.''
The article appeared in CQ Magazine in 1998.  Read it at
http://solar.spacew.com/cq/cqmar98.pdf.  Thanks to Randy for sharing
it with us.

If you would like to comment or have a tip, email the author at,
k7ra@arrl.net.

For more information concerning radio propagation and an explanation
of the numbers used in this bulletin see the ARRL Technical
Information Service propagation page at,
http://www.arrl.org/tis/info/propagation.html.  An archive of past
bulletins is found at http://www.arrl.org/w1aw/prop/.

Sunspot numbers for April 14 through 20 were 63, 61, 52, 54, 44, 43
and 39 with a mean of 50.9. 10.7 cm flux was 85.4, 84.9, 82.9, 83.6,
81.3, 78.2 and 77, with a mean of 81.9. Estimated planetary A
indices were 19, 13, 7, 5, 8, 8 and 21 with a mean of 11.6.
Estimated mid-latitude A indices were 14, 7, 4, 4, 5, 6 and 12, with
a mean of 7.4.
NNNN
/EX

------=_NextPart_000_0005_01C549AD.E9773240
Content-Type: application/x-pkcs7-signature;
	name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename="smime.p7s"
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------=_NextPart_000_0005_01C549AD.E9773240--

EXPLORE ARRL

Instragram     Facebook     Twitter     YouTube     LinkedIn