Alan,
WE6XGR 500 khz Opera decoded on the west coast , no decodes
showing on the psk-map into EU last night .
G.
N1GKE 600m OPERA 289 miles 05:02:51
K3SIW 600m OPERA 580 miles 04:58:45
AC4IU 600m OPERA 306 miles 04:58:44
K4RKM 600m OPERA 585 miles 04:58:44
WE6XGR 600m OPERA 0 miles 04:58:42
NO3M 600m OPERA 171 miles 04:50:31
K1CF 600m OPERA 280 miles 04:34:06
N6RY 600m OPERA 2267 miles 04:13:33
W1VD 600m OPERA 214 miles 03:20:09
WB2LMV 600m OPERA 150 miles 02:39:04
W3NF 600m OPERA 233 miles 00:07:03
Monitor: N6RY Loc DM13ID
Frequency: 0.500 MHz (600m)
Show all seen by N6RY
Last report: WE6XGR
at Fri, 09 Mar 2012 04:13:33 GMT
--------------------------------------------------
From: "ALAN MELIA" <[email protected]>
Sent: Friday, March 09, 2012 12:59 PM
To: <[email protected]>
Subject: Re: LF: Big solar flare - major geomagnetic storms to follow
Hi Jay thanks for the confirmation.....:-))
Also the VLF effects, I have never been quite sure of the effects down
there.....but they should be similar. I wonder whether the beacons will
throw up any data about the 500kHz effects over long distances??
Alan
--- On Fri, 9/3/12, [email protected] <[email protected]> wrote:
From: [email protected] <[email protected]>
Subject: Re: LF: Big solar flare - major geomagnetic storms to follow
To: [email protected]
Date: Friday, 9 March, 2012, 12:42
Alan
Thanks for the update and insight.
Absolutely no trace of Stefan's signal in CT last night. A
few nights back he was 25+ dB s/n (in 28 mHz). Long distance
VLF signal levels below normal as well.
Jay W1VD WD2XNS WE2XGR/2
----- Original Message ----- From: "ALAN MELIA"
<[email protected]>
To: <[email protected]>
Sent: Friday, March 09, 2012 5:57 AM
Subject: Re: LF: Big solar flare - major geomagnetic storms
to follow
Hi all more geomag storming this morning. It looks as though
I might have got my timing wrong. However the 56 hours to
the Kp=7 event is a bit slow for such a big event, and the
predicted speed of that CME.
I suspect this mornings event may be what I refered to
yesterday as a "sub-storm". This occurs when the plasma
cloud sweeps past Earth and some is then trapped in a
"magnetic bottle" in the tail of the magnetosphere. The
magnetic field becomes highly distorted and twisted by the
extra hot charge. Just as in the Sun-spots this strain is
relieved as the field snaps back into a lower energy state.
The excess energy which is released as the field collapses
is transfered to the plasma "glob". The result is that two
parts of the plasma are fired off at very high speed. one
towads Earth and one away from Earth (to conserve
momentum....a basic law of physics). This mornings event was
the shock of that plasma "bullet" arriving. I believe this
mornings event may have been of this nature.
How does it affect LF? The charge from the "bullet" is
injected into the ring current so tops up the charge
reservoir, and this lengthens the period of excess
attenuation in the night-time D-layer. There is some
discrepancy between the Dst estimates. The Colorado estimate
is running at about -50nT whilst the Kyoto value is around
-150nT. Kyoto is based on a number of ground located
magnetometer observations and is prone to rather wild
fluctuations, and often "overshoots". The Colorado plot is
based on a calculation using the solar wind parameters as
observed by the ACE satellite. From my experience I find the
latter to be more useful/meaningful in terms of LF effects.
Overall I think this indicates a mild effect. Long distance
night-time paths will be affected for a week or so. For a
good indication of the progress of of the recovery, watch
the Dst as it returns to around -20nT....the indication of
quiet, good propagation conditions. Just before the
conditions settle there can be some exceptionally good
nights, probably caused by favourable fading/multipath.
These are very location dependent and do not work for
everyone.
However keep watching..... NOAA predict the possibility of
more X-Class flares from the current spots, with the
associated CMEs.
Good LF DXing !!
Alan
G3NYK
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