Gemini 4 Experiment Debriefing, 1967

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JOCELYN- Cy OF AFTERNOON SESSION OF GT-4
EXP. DEDRIGFING. FOR INFO-

7-6-5

1

Belt 11

Dunkelman;

35 or something like that down from looking at the air glow edge on Now the air glow was discovered quite a number of years ago when it was studied from the ground the hard way and, uh, uh, by betometer (?), and by (triangulation), by trying to determine how high it was, it was many years before one had some idea how high the air glow really was, and in a moment we will indicate how in a matter of seconds Glenn and Carpenter was able to determine in a matter of seconds how high it was. And then he did away with 30 years of hard work. Again, there was a discovery made there, but the point was that in a few seconds from the right vantage point you can do a job. Now with the air glow then looking edge on it sort of, uh, ... we'll ... a band we never mean by band a real perfectly designed band like in the slide or something like that, it sometimes a little fuzzy but this is the air glow band and this is the earth, and this is roughly about 90 kilometers as determined by Carpenter and by rocket passing through the air glow. Uh, this is the air glow edge on that we have heard about this morning uh, it was used in connection with the (Sextan) experiments and so on. Now I just wanted to give you some idea of where we stand in brightness. Now, uh, before Glenn was to have gone off uh, the thought was to have him intimate some visual observations during whatever time he might have. And NASA headquarters and we at Goddard uh, thought about it a little bit and, uh... Mary Dulin, Jocelyn, Murry (Drewman) and Johnson (Gill) and myself thought perhaps a little work on the air glow might be a good beginning. And uh, uh, John Glenn was given a narrow, interference filter very similar to this type that was used over the (Sextan). Uh, he, he, us, did not have very much time

June 25, 1967