ENGINEERING RESEARCH INSTITUTE UNIVERSITY OF MICHIGAN ANN ARBOR PROGRESS REPORT 1 December 1952 to 1 March 1953 UPPER ATMOSPHERE TEMPERATURE AND PRESSURE MEASUREMENT REPORT NO. A-15 By H. F. SCHULTE PROJECT DIRECTOR: W. G. DOW Submitted to the Geophysics Research Division, Air Force Cambridge Research Center, Cambridge, Massachusetts. The work reported herein is of a preliminary nature and the results are not necessarily in final form. Approved by: N. W. Spencer Project Engineer Project M824 U. S. AIR FORCE, AIR FORCE CAMBRIDGE RESEARCH CENTER CONTRACT NO. AF 19(122)-55 March, 19553

PERSONNEL EMPLOYED DURING PERIOD OF REPORT W. G. Dow Project Director H. C. Early Research Engineer Part-time H. S. Sicinski Research Physicist Part-time H. L. Smith Research Engineer Part-Time N. W. Spencer Project Engineer Note: With the exception of the above personnel, members of the group previously listed here were engaged in work supported by Contract No. AF 19(604)-545, which is a continuation of the present contract. ii

ABSTRACT The results of the ambient temperature measurement from the September 1951 Aerobee firing are presented in this report. Completion of a paper for publication in the Physical Review is also reported. iii

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN PROGRESS REPORT 1 December 1952 to 1 March 1953 UPPER ATMOSPHERE TEMPERATURE AND PRESSURE MEASUREMEN REPORT NO. A-15 DATA ANALYSIS With the exception of the air-density measurement utilizing the Pasdren Law,* all data analysis has been completed for the University of Michigan Aerobee (USAF 18) fired 15 September 1951. Figure 1 presents the results of the ambient temperature measurement for this firing. The limits indicated with each point represent the probable error associated with the point. It is expected that more detailed data will be presented in the final report to be issued at the termination of this contract. *Progress Report No. A-8, Contract No. AF 19(122)-55, October, 1951.

AMBIENT TEMPERATURE MEASUREMENT RESULTING FROM U OF M. 13 SEPTEMBER 1951. AEROBEE ROCKET FIRING. 290- ----.280R T7 i 0 r n mcr 11 11 rr rr rr \ 260. 250 T cco * ROCKET PANEL M ADOPTED l I230 c, ~e -22 —210 HEIGHT (KM.) 30 0 50 60 70 20o0 - -ROCKET- PANEL ADOPTED 231.7 262.5 270.8 252.8 218.0 - - VALUES S M'OOTHED. 190 -- - VALUES 230 271 268 238 1.89' OBSERVED FIG. I 50.0.0 410' 4.50 * (O0 55M.O0 600 6.0 700 7?0 ALTITUDE (KM)

- ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN PUBLICATIONS A paper titled "Rocket Measurement of Upper Atmosphere Ambinet Temperature and Pressure in 30 to 75-Kilometer Region", was completed during this period. Copies were sent to the Air Force Cambridge Research Center in January, 1953, and clearance for release was received in February. The manuscript was then submitted for publication in the Physical Review. PERSONNEL AND FISCAL INFORMATION No additional personnel were added to the project during this period. No property was acquired during this reporting interval. ---------------------- 5 -------------------— 3