Topband: 160 Meter Propagation Indices

[Bert Barry]

"Thomas Giella, KN4LF (by way of Bill Tippett )" wrote:
> ...  However the following indices parameter levels will
> (((generally))) point to good 160 meter propagation conditions.
> ...
> 6.) Energetic protons no greater then 10 MeV (10+0).
> 
Thomas,

What does this mean??  I am a retired Research Scientist who has spent almost
his entire career in the Space Radiation field, but this doesn't make any
sense at all to me!

Bert, VE3QAA