(b) Wind patterns via cloud motions, or movement of injected tracers. (c) Mass spectrometer ion composition measurements. 3. Airglow observations (a) OH emission photometry in selected bands, both wide and narrow view. (b) OH rotational spectroscopy. (c) H2O 6.3 pm emission spectroscopy from rockets. All of the above instruments and techniques have been used in earlier cloud/aerosol/aeronomy studies. What remains to be done is to address the following practical and technical problems: Which of experiments 1-8, if any, will yield new information relevant to an environmental assessment of the proposed SPS rocket program? Are such experiments feasible, given the time and funds available? What instrument modifications or development will be needed? Will there be ample opportunity to make the required observations? 2.11.3 NO Production on Reentry (Whitten) (Priority: U,M) The quantity of nitric oxide produced by a reentering Space Shuttle has been calculated by Park (1976), but the computations have never been validated by observation. The following experiment is suggested for that purpose, using simple scaling to extend the results to HLLV reentry. We envisage two sets of airborne observations, one to measure the emission spectrum in the wake arising from the NO + 0 chemiluminescence in the 0.6-1.1 pm spectral region, and a second to measure the intensities in the 5.3 pn (fundamental) and 2.7 pm (first overtone) bands of NO. The 0.6-1.1 pm emissions will occur in the wake so that about 10 minutes are available for the measurement of intensities. The second observation must be made above the tropopause so that atmospheric water vapor interference does not prevent observation of the NO bands (Traub and Stier, 1976). Furthermore, a relatively high resolution spectrograph must be employed. The computer model used to calculate the NO production during reentry can be modified to yield the predicted infrared band intensities as well as the intensities for the NO + 0 chemiluminescence reaction. These theoretical results would then be compared with measured intensities at corresponding points along the wake. 2.11.4 Rocket Observations (Mendillo) Given the enormous costs involved with rocket launches, every effort should be made to support investigators wishing to monitor various effects associated with planned rocket programs, if these "experiments of opportunity" are likely to be of value for the SPS assessment. There are several types of such experiments of opportunity:
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