Re: LF: Re: DST and propagation

["Michael Sapp" <wa3tts@verizon.net>]

Alan, Stefan & All: The LF T/A dx event did coincide with or just after a C-class X-ray flux event of moderate duration (30 minutes or so).  It was a lower level C-class event in the C2 or C3 range.  Perhaps the combination of the X-ray flux event and geomagnetic state are involved in the propagation enhancement. 

 

Also interesting that the resulting T/A dx event was farther to the south in the U.S. Perhaps some seasonal cyclic factor is involved as well.   I was surprised that neither WG2XJM, WG2XKA, W1VD, or W1TAG reported any T/A in that time period, although VD and TAG may not have been on the air at the time.  To the west I have not had any captures from WH2XCR in the last week or so, although other stations farther south of my location have captured XCR recently and XJM has done so with his large RX antenna arrays.  If there is a seasonal-latitude probability factor in addition to the X-ray flux and geomagnetic states, then I would expect better chances of T/A events in the coming months  of Febuary and March of this year for my inland location.

 

73, Mike wa3tts

----- Original Message -----

From: Alan Melia

To: rsgb_lf_group@blacksheep.org

Sent: Friday, January 22, 2016 9:02 AM

Subject: Re: LF: Re: DST and propagation

Thanks Stefan. MMmmm interesting......the DST was stable at around -50nT and did not dip further on the CME on the 21st it was slightly above the value early morning on the 20th. The precipitation is at high latitudes and does, it is thought, take a little while to diffuse to lower latitudes. Again the Dst is the "pressure" behind the electron injection it is not related to the concentration of hot (excess absorbing) electrons in the ionosphere.

 

Thanks for your test, it adds to the suggestion that Dst below -20nT can affect your signal propagation.

 

Best Wishes

Alan

G3NYK

 

----- Original Message -----

From: DK7FC

To: rsgb_lf_group@blacksheep.org

Sent: Friday, January 22, 2016 1:15 PM

Subject: Re: LF: Re: DST and propagation

Am 21.01.2016 14:58, schrieb Alan Melia:

[...] I would love to see the effect over the 21/22nd darkness period if you do not have anything different planned :-))

 

Thanks and Best Wishes

Alan G3NYK

...not a single decode for me last night. AA1A became QRV at 0:12 UTC or earlier. No detections on the TA path at all this night....

73, Stefan