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The 0 I line, which is strongly emitted by the high atmosphere, falls in a convenient position to be observed from aircraft. The 0 III line which is an important line for coronal studies and also for H II regions studies, will be fairly easy to observe from aircraft. Other lines, such as the C II line, are strongly blended by H 2 0, but this is not the common case. 40000 35000 30000 ..... I- w 25000 W lJ.. Q=1,85}l 10000 5000 #,CLOUD LAYER~ 10 100 1000 PRECIPITABLE WATER (MICRONS) Fig. 1. Measurement of vertical distribution of precipitable water on a particular day.

One is the interstellar molecule temperature measurements by Bortolot et al. [11]. These give upper limits. The others are the rocket measurements first made by Shivanandan et al. [12]. 7 K curve and very broad in spectrum. Figure 16 shows the rocket result more dramatically. More recent rocket calibrations have reduced the observed submillimetre flux by about a factor of 2. 0. 10. 4 A A 9 ,..... 8 IN - - I IL 7 (\) +' III lu 6 f l- III C\l - CH+ (\) 5 E u 01 L ~ 4 r- - "

Peebles [3] has published the data recently in a paper concerning cosmology and infrared astronomy. There is given the surface brightness of the sky background versus wavelength. In the near infrared, at some microns, there exists up to now only a rocket measurement of Harwit et al. [4]. L. An experiment prepared for the ESRO-satellite TDI in nearly the same wavelengthregion was cancelled [5]. The disadvantages of a rocket experiment, the short observation and pointing time and the limited payload are not present in a balloon-borne experiment.

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A Study of Transmit and Receive Antenna Diversity Techniques for Communication Systems [thesis] by Q. Yan

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