First evidence of middle atmospheric HO2 response to 27 day solar cycles from satellite observations

摘要: HO_2 and OH, also known as HO_x, play an important role in controlling middle atmospheric O_3. Due to their photochemical production short chemical lifetimes, HO_x are expected respond rapidly solar irradiance changes, resulting O_3 variability. While OH cycle signals have been investigated, studies limited by the lack of reliable observations. Here we present first evidence variability during 27 day cycles investigating recently developed data from Aura Microwave Limb Sounder (MLS). We focus on 2012–2015, when is strong near peak Solar Cycle 24. The features variability, with strongest at 0.01–0.068 hPa, correlate well those Lyman α. When continuous MLS observations not available, new could be a promising alternative for corresponding impacts climate.