[Propagation] Ionoprobe and "Effective Sunspot Number"

[Pete Smith <n4zr@contesting.com>]

I have just been experimenting with VE3NEA's Ionoprobe software, which 
downloads and displays SESC data (www.dxatlas.com).  There's one parameter 
it displays that I haven't heard of before -- Effective Sunspot 
Number.  Compounding my confusion, it is currently showing this value as 
-4.  ????

73, Pete N4ZR
The World HF Contest Station Database
was updated 20 Oct 2004
2796 contest stations at
www.pvrc.org/WCSD/WCSDsearch.htm  

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