KELLOOGs (continued) in which we are interested, in the vicinity of the tropopause, is about one ion pair per cubic centimeter per second. Is this right—te those waco aight be sore faniliar with comic rays? I worked baciward, uging the recoubination coefficient and tus auaber of atmospheric ions, and caze to the conclusion that it would be avout one per cuble contineter per second froa cosaic rays at around %) kilesacters....What's that? BETHE: That. svands rather low. KELLOGGs low? HOLZER « Yea, I think it ia low, wii. Well, the nazber that was sentlioned was a thousand atmospheric dens per aubic centineter. WYCKORF(?)s The mobility 4a very higt up there, you know. KELLOOO: Fell, just taking the number of ion paire—this number was mentioned—end if one uses the usual 10° for a reconbination coefficient of atacepheric ions, then ons concludes that 1,009 ton paira per cubic cantineter and this rate ef recosbination would be equilitrius for one ion paly produced per cabic eentineter per second, I think that we could raise this by a facter ef 10 easily. le it a facter of more than 107? Well anyway, the number of ion pairs formed by atomic cloud 20 KT, and roughly the sise P| DUE ARCHIVES