It has been well accepted that sodium is a minor constituent in the up
per atmosphere. The possible formation and destruction processes of so
dium has been considered and the following results are obtained: (i) A
n empirical equation has been established for calculation of the conce
ntration of sodium for different altitude and time, (ii) It is confirm
ed that the rate constant for the reaction NaO + O-2 - Na + O-3 is tem
perature dependent. The activation energy for this reaction is 70.88 K
cals/mole.