aa_ sree | RPLLOGOs (continued) o , — which i have indicated there, taking into account decay soald be in the order of 400,060 ion pairs per cubic centimeter per second in one day. VOICE: Fhat tins slanent? KELLOGGs One day having expended go that the volume, thisis the svarage in the eloud, bas expanded dua te this kind ef diffusion. At the end of two days, three days, four days, it will of course decay further and would-—I have not made the eslenistion as to when it would cet down to the leval of cosmic rays, I judge it would be sowething in the order of a week before 1% would get down in the center of such a cloud te anywhere appresching the coenic-ray ion produstion. estizeted first. This is ene thing whieh had to be I don't think this estinate is 4 very 2co~ curate one, but it does sugcest that one could use the conduc- tivity to track the gloud for at least « matter of days. The idea of finding where the cloud goes in the stratosphere is a wery attractive one, because I think it is largely a astter of eonjecture now as tc how vertical diffusion dees take place in the stratosphere. J agree with H. Yexler in imagining that it would be very slow, Yertioal diffusion in the upper part of the stratosphere certainly would be vary slow. Be have sone evidance, though, that suggeste that vertical diffusion in the lower part of the stratosphere, which is alse stable, is rather high. _aeneeN ‘This is based on observations of axoke BOE ARCHIVES