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Ultraviolet emissions quantified by rocket payloads

机译：通过火箭有效载荷量化的紫外线排放

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Abstract: Plumes and aerodynamic shock structures of rockets produce prominent UV and IR emissions. The extensive literature explains many aspects of the IR emission: whereas the UV emissions are less well understood and have only recently been quantified. Hypervelocity missiles in the continuum and near-continuum atmosphere produce high temperature shocklayers (i.e., 8000 K for speeds of 5 km/sec). Atmospheric molecular oxygen and nitrogen react and the products are excited to produce nitrogen oxide molecular - band radiation. Previous papers describe two rocket flight experiments that obtained in-situ radiometric UV data with onboard instruments directly viewing the shocklayer and plume regions. An example of data obtained were the well defined spectra of NO ($Gamma@,$Beta@) emission with signal strengths on the order of 0.0014 W/cm$+2$/sr for a rocket velocity of 5 km/sec at 70 km. This radiance was 15 times stronger than recent theoretical predictions and is observable using present detector systems. The UV radiance and background data that has been collected from these rocket flights and the LACE/UVPI satellite program implies a systems utility. In addition, a third experiment is being planned to extend the velocity to 7 km/sec. Scanning spectrometers and photometers will observe the shock plume interactions. Angular scanning is being included to define the structures of the far field plume. The area of greatest uncertainty and potential opportunity will be described in terms of the mechanistic understanding. !14
机译：摘要：火箭的气柱和空气动力学冲击结构产生明显的紫外线和红外线辐射。大量的文献解释了IR发射的许多方面：而UV发射则鲜为人知，只是最近才被量化。连续和近连续大气层中的超高速导弹会产生高温冲击层（即，以8000 km的速度行驶5 km / sec）。大气中的分子氧与氮发生反应，产物被激发而产生氮氧化物分子带辐射。先前的论文描述了两个火箭飞行实验，这些实验是通过直接观察震荡层和羽流区域的机载仪器获得的原位辐射紫外线数据。获得的数据示例是清晰定义的NO（$ Gamma @，$ Beta @）发射光谱，信号强度为0.0014 W / cm $ + 2 $ / sr，对于70 km / h的火箭速度为5 km / sec公里该辐射强度比最近的理论预测强15倍，使用当前的探测器系统可以观察到。从这些火箭飞行和LACE / UVPI卫星计划收集到的紫外线辐射和背景数据暗示了系统的实用性。此外，正在计划进行第三次实验，以将速度扩展到7 km / sec。扫描光谱仪和光度计将观察冲击羽的相互作用。包括角扫描以定义远场羽流的结构。将根据机械理解来描述最大不确定性和潜在机会的区域。 ！14

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