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Technical Topics => Propagation => Topic started by: IZS4 on January 16, 2020, 1909 UTC

Title: Grey line map (real time)
Post by: IZS4 on January 16, 2020, 1909 UTC
I thought I may have ask about this once, but I couldn't find a previous post. What are you all using when it comes to real time Grey line maps? I thought there might be a Black Cat Systems program, but I didn't see one listed. Thanks
Title: Re: Grey line map (real time)
Post by: jFarley on January 16, 2020, 1920 UTC
https://www.universal-radio.com/catalog/misc/0059.html

It's old school and discontinued, but emits no EMI, requires no batteries, and adds no clutter to the monitor display.
Title: Re: Grey line map (real time)
Post by: IZS4 on January 16, 2020, 1929 UTC
Interesting. I see that it comes with 12 slides for each month of the year. Not sure it would be easy to find though.
Title: Re: Grey line map (real time)
Post by: JCMaxwell on January 16, 2020, 1929 UTC
I use Simonís :

https://www.sdr-radio.com/download (https://www.sdr-radio.com/download)
Title: Re: Grey line map (real time)
Post by: Josh on January 16, 2020, 1935 UTC
https://www.amazon.com/Geochron-Standard-World-Goatskin-Silver/dp/B00XYYFBF8







for the well-heeled nerd
Title: Re: Grey line map (real time)
Post by: ChrisSmolinski on January 16, 2020, 1940 UTC
I thought I may have ask about this once, but I couldn't find a previous post. What are you all using when it comes to real time Grey line maps? I thought there might be a Black Cat Systems program, but I didn't see one listed. Thanks

Yes, my DX ToolBox has a Grey Line map, as well as about 157 other maps  ;D

https://www.blackcatsystems.com/software/ham-shortwave-radio-propagation-software.html
Title: Re: Grey line map (real time)
Post by: IZS4 on January 16, 2020, 1948 UTC
Josh, The Black Goat skin model is nice, but I've decided on the Veneer Hickory model at $2950.00. And to think I didn't even know if I was going to be able to find something 'Decent' in my price range!
Title: Re: Grey line map (real time)
Post by: BoomboxDX on January 21, 2020, 0234 UTC
I use one of the online ones. A solar propagation site has one that works.

http://www.spacew.com/www/realtime.php
Title: Re: Grey line map (real time)
Post by: NJQA on January 21, 2020, 1056 UTC

I use one of the online ones. A solar propagation site has one that works.

http://www.spacew.com/www/realtime.php

While the grayline may be correct, donít be fooled by the rest of the data at the map link above.  It has been a long time since we have seen a SSN of 86.
Title: Re: Grey line map (real time)
Post by: ThaDood on January 21, 2020, 1735 UTC
I use the one on DX Maps,     http://www.dxmaps.com/spots/mapg.php?Lan=E&Frec=50&ML=M&Map=W2LN&HF=N&DXC=ING2&GL=S
But, that just shows Grey Line for present day. Still, I've used it for 40M for USA East Coast and Aussi Grey Lining in April on 40M.
Title: Re: Grey line map (real time)
Post by: Traveling Wave on January 23, 2020, 0144 UTC
Not the best but PSK reporter is useful...https://pskreporter.info/pskmap.html
Title: Re: Grey line map (real time)
Post by: IZS4 on January 23, 2020, 0213 UTC
Thanks for all the feedback.
Title: Re: Grey line map (real time)
Post by: BoomboxDX on February 04, 2020, 0423 UTC

I use one of the online ones. A solar propagation site has one that works.

http://www.spacew.com/www/realtime.php

While the grayline may be correct, donít be fooled by the rest of the data at the map link above.  It has been a long time since we have seen a SSN of 86.

"SSN"? I don't even see a reference to an SSN (whatever that is) on the page anywhere. It has the grey line, radio auroral zones, and MUFs delineated and mentioned, and that's about it.

And I've found the grey line useful, as well as the auroral radio zone demarcation (the green lines at the top of the map). And -- for the most part -- I've found them accurate enough for SWLing.
Title: Re: Grey line map (real time)
Post by: NJQA on February 04, 2020, 1100 UTC

I use one of the online ones. A solar propagation site has one that works.

http://www.spacew.com/www/realtime.php

While the grayline may be correct, donít be fooled by the rest of the data at the map link above.  It has been a long time since we have seen a SSN of 86.

"SSN"? I don't even see a reference to an SSN (whatever that is) on the page anywhere. It has the grey line, radio auroral zones, and MUFs delineated and mentioned, and that's about it.


If you look at the graphic, there is a black bar at the bottom where they show the Smoothed Sunspot Number (SSN), which is used to calculate the MUF.

The true current value is on the order of ď5Ē or so.  You can tell that they are using the wrong number because the MUF values the graphic has are unreasonably high.  A SSN value of 86 would have been reasonable 5 years ago - not today.

You can find better numbers for SSN here:

https://www.sws.bom.gov.au/Solar/1/6


Title: Re: Grey line map (real time)
Post by: BoomboxDX on February 05, 2020, 0906 UTC
^^^^^ Fair enough, thanks for the explanation.
Title: Re: Grey line map (real time)
Post by: NJQA on February 05, 2020, 1156 UTC
This is something to be aware of as some propagation prediction programs are using old SSN lookup tables.  This was recently mentioned here:

https://swling.com/blog/2020/01/ham-cap-and-voa-prop-fixing-ssn-look-up-files/