W1AW Bulletins Propagation

This is a multi-part message in MIME format. ------_=_NextPart_001_01C2ED8B.9683153F Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable SB PROP @ ARL $ARLP011 ARLP011 Propagation de K7RA ZCZC AP11 QST de W1AW =20 Propagation Forecast Bulletin 11 ARLP011 From Tad Cook, K7RA Seattle, WA March 14, 2003 To all radio amateurs=20 SB PROP ARL ARLP011 ARLP011 Propagation de K7RA Average daily solar flux and sunspot numbers were up again this week. Average daily sunspot numbers, which were up nearly 50 points last week compared to the previous week, this week rose nearly 70 points compared to last week. Average daily solar flux was up 30 points last week and over 7 points this week. Solar flux is expected to decline to just above 100 from March 20-24, around the time of the solar equinox. There is a large coronal hole responsible for a solar wind stream heading our way. It could result in some active geomagnetic conditions this weekend, but so far only unsettled conditions are predicted through Sunday, with a planetary A index around 15. Note that the vernal equinox is coming up this week, a wonderful time for HF propagation. On the first day of spring the night and day will be exactly 12 hours each, all over the world, from the equator to the poles. Over the winter in the northern hemisphere, signals traveling to the southern hemisphere have to deal with summertime propagation modes. At either equinox (autumnal or vernal) the whole earth is blessed with an even distribution of solar radiation. For more information about propagation and an explanation of the numbers used in this bulletin, see the Propagation page on the ARRL Web site at, http://www.arrl.org/tis/info/propagation.html and especially the article "The Sun, the Earth, the Ionosphere," by Carl Luetzelschwab, K9LA. Sunspot numbers for March 6 through 12 were 132, 191, 203, 224, 214, 142, and 109, with a mean of 173.6. 10.7 cm flux was 150.3, 149.9, 148.3, 152.7, 143.7, 141.5, and 138, with a mean of 146.3. Estimated planetary A indices were 25, 14, 9, 11, 16, 13, and 9, with a mean of 13.9. NNNN /EX ------_=_NextPart_001_01C2ED8B.9683153F Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ARLP011 Propagation de K7RA

SB PROP @ ARL $ARLP011
ARLP011 Propagation de K7RA

ZCZC AP11
QST de W1AW
Propagation Forecast Bulletin 11 ARLP011
From Tad Cook, K7RA
Seattle, WA March 14, 2003
To all radio amateurs

SB PROP ARL ARLP011
ARLP011 Propagation de K7RA

Average daily solar flux and sunspot numbers were up = again this
week. Average daily sunspot numbers, which were up = nearly 50 points
last week compared to the previous week, this week = rose nearly 70
points compared to last week. Average daily solar = flux was up 30
points last week and over 7 points this week. Solar = flux is expected
to decline to just above 100 from March 20-24, around = the time of
the solar equinox.

There is a large coronal hole responsible for a solar = wind stream
heading our way. It could result in some active = geomagnetic
conditions this weekend, but so far only unsettled = conditions are
predicted through Sunday, with a planetary A index = around 15.

Note that the vernal equinox is coming up this week, a = wonderful
time for HF propagation. On the first day of spring = the night and
day will be exactly 12 hours each, all over the = world, from the
equator to the poles. Over the winter in the northern = hemisphere,
signals traveling to the southern hemisphere have to = deal with
summertime propagation modes.

At either equinox (autumnal or vernal) the whole earth = is blessed
with an even distribution of solar radiation.

For more information about propagation and an = explanation of the
numbers used in this bulletin, see the Propagation = page on the ARRL
Web site at, http://www.arrl.or= g/tis/info/propagation.html and
especially the article "The Sun, the Earth, the = Ionosphere," by Carl
Luetzelschwab, K9LA.

Sunspot numbers for March 6 through 12 were 132, 191, = 203, 224, 214,
142, and 109, with a mean of 173.6. 10.7 cm flux was = 150.3, 149.9,
148.3, 152.7, 143.7, 141.5, and 138, with a mean of = 146.3. Estimated
planetary A indices were 25, 14, 9, 11, 16, 13, and = 9, with a mean
of 13.9.
NNNN
/EX

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