That «backsplash» of protons, which was discovered by CRaTER and is known as the moon's radiation «albedo,» is caused by the partial reflection of galactic cosmic rays off the moon's surface.
He dismissed that positive feedback in reliance on Svensmark's galacticcosmicray conjecture, never recognizing the cloud burn - off effect, nor published correlations between GAST and GCRs and between GAST and TSI.