Message-ID: <BLU153-W7B8F81140FFCE4ED08C28CFDD0@phx.gbl>
From: Laurence KL7UK <hellozerohellozero@hotmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Mon, 23 Jul 2012 13:45:45 -0800
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Subject: LF: Chaff and LF
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=20
One of the most interesting weather reports this week was from Hawaii - whe=
n a radar image showed a broad swarth of radar returns some 15 miles long a=
nd 1 mile wide gradually moving South with the prevailing wind. I first tho=
ught it was a a weather gust front or rain squal but the weather chappy say=
s it was from the ongoing military exercises and they had dropped a large a=
mount of the chaff stuff (radar sized/reflective) and it was causing the X =
band radar to show it in detail.=20
=20
I was pondering - as I sat on the beach on Maui the next day whether this f=
orm of chaff can actually produces anomolies below the frequency engineered=
 - as a lot of the new type of chaff has to cover a load of GHz and MHz cha=
nnelling - if the area is large enough=2C as this was=2C and the drop densi=
ty of reflective material is large enough whether it would cause some effec=
ts as it appeared to be dropped from 30=2C000ft or so...even down to LF...?
=20
Another anomoly was seen this morning when I was returning from Honolulu ba=
ck to Anchorage - I was approx 1200 miles South of Anchorage and a Blue glo=
w started to appear - firstly I thought it was just a band of Green/Blue Au=
roral light we get fairly often but  as we got closer it was the Notchtiluc=
ent clouds way way above us - banded=2C stripes and globs of thin cloud bei=
ng illuminated by the sun which was way below our horizon and actually not =
even a pre glow. Now - this isnt a normal radio thing either but on reading=
 up on these clouds it appears they too are radio reflective up to a point =
given the ions that attach to the nulceous and given they appear to be sub-=
polar or polar=2C and mostly a summer thing=2C when the temps are coldest a=
t that altitude Im wondering if some of the oddities we see on MF and HF ar=
e caused by these clouds too...
=20
  		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>
&nbsp=3B<BR>
One of the most interesting weather reports this week was from Hawaii - whe=
n a radar image showed a broad swarth of radar returns some 15 miles long a=
nd 1 mile wide gradually moving South with the prevailing wind. I first tho=
ught it was a a weather gust front or rain squal but the weather chappy say=
s it was from the ongoing military exercises and they had dropped a large a=
mount of the chaff&nbsp=3Bstuff (radar sized/reflective) and it was causing=
 the X band radar to show it in detail. <BR>
&nbsp=3B<BR>
I was pondering - as I sat on the beach on Maui the next day whether this f=
orm of chaff can actually produces anomolies below the frequency engineered=
 - as a lot of the new type of chaff has to cover a load of GHz and MHz cha=
nnelling - if the area is large enough=2C as this was=2C and the drop densi=
ty of reflective material is large enough whether it would cause some effec=
ts as it appeared to be dropped from 30=2C000ft or so...even down to LF...?=
<BR>
&nbsp=3B<BR>
Another anomoly was seen this morning when I was returning from Honolulu ba=
ck to Anchorage - I was approx 1200 miles South of Anchorage and a Blue glo=
w started to appear - firstly I thought it was just a band of Green/Blue Au=
roral light we get fairly often but&nbsp=3B as we got closer it was the Not=
chtilucent clouds way way above us - banded=2C stripes and globs of thin cl=
oud being illuminated by the sun which was way below our horizon and actual=
ly not even a pre glow. Now - this isnt a normal radio thing either but on =
reading up on these clouds it appears they too are radio reflective up to a=
 point given the ions that attach to the nulceous and given they appear to =
be sub-polar or polar=2C and mostly a summer thing=2C when the temps are co=
ldest at that altitude Im wondering if some of the oddities we see on MF an=
d HF are caused by these clouds too...<BR>
&nbsp=3B<BR>
&nbsp=3B<BR> 		 	   		  </div></body>
</html>=

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