{'fraction_non_alphanumeric': 0.028291621327529923, 'fraction_numerical': 0.002176278563656148, 'mean_word_length': 5.618705035971223, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Influence of lower stratospheric aerosol variations on guidestar performance.

The probability distribution function for the logarithm of the mixing scatter ratio, based on long-term measurements of lower-stratospheric aerosol loading, is derived to model variations in total backscatter coefficient and extinction profiles in the visible and the near infrared (NIR). The profiles are used to estimate signal-to-noise ratio, laser-pulse energy, and wave-front measurement error with respect to backscatter strength, guidestar pulse length and altitude, and pixel noise. The results show that for a given wave-front measurement phase error (1) visible guidestars require less pulse energy for aerosol concentrations near background, where molecular backscatter dominates, and (2) for high aerosol loading following a major volcanic event, a NIR guidestar can reduce the energy requirement below that for visible sensing.