PRELIMINARY STUDY OF THE EFFECT OF OZONE ON ATMOSPHERIC TRANSMISSION IN THE RANGE 0.25 MICRON TO 0.60 MICRON
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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The Project PRESS airborne optical program employs instrumentation having a spectral cover age from 0.25 micron to 15 microns. In relation to PRESS optical measurements, computation of atmospheric transmission in the range 0.25 to 0.60 micron were performed to find the effects of the presence of atmospheric ozone. Graphical and tabular presentations of the transmission through a selected vertical distribution of ozone, which is representative of low latitudes, are given for various target-to-aircraft horizontal distances and for numerous look-angles. The transmission versus wavelength curves show the known atmospheric opaqueness to ultraviolet radiation in the range 0.25 to 0.29 micron. The transmission versus look-angle curves show that maximum absorption, for the particular vertical distribution of ozone used, is experienced be tween look-angles of eight to ten degrees. This infers that maximum absorption will take place when the PRESS optical instrumentation is recording re-entry phenomena between the heights of 200,000 and 100,000 feet and at a horizontal distance of 80 nautical miles perpendicular to the trajectory. Because of the lack of information about the vertical distribution of ozone at low latitudes, it is recommended that actual measurements be made in the vicinity of Kwajalein prior to the PRESS experiments.
- Atmospheric Physics
- Radiofrequency Wave Propagation