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内容説明 This book presents carefully edited and peer-reviewed papers from the 2nd International Workshop on Occultations for Probing Atmosphere and Climate (OPAC-2)， held in Graz， Austria. It starts with a general introductory paper and proceeds to address the full range from methodology in general via specific occultation methods (GNSS-LEO， LEO-LEO， stellar and solar) to the use of occultation data， with focus on atmospheric physics， meteorology and climate.