Northern Mid‐Latitude Mesospheric Cloud Frequencies Observed by AIM/CIPS: Interannual Variability Driven by Space Traffic

Abstract Recent advances in data processing from the Cloud Imaging and Particle Size (CIPS) instrument on NASA Aeronomy of Ice Mesosphere satellite allow observation bright mesospheric clouds at mid‐latitudes (<60°). When adjusted for evolving local time (LT) CIPS observations during its mission we find that frequencies these northern hemisphere show no trend 2007 to 2021 dependence solar cycle, although interannual variability is extreme. Rather investigate possible link with propellant exhaust orbital vehicles, typically launched lower latitudes. By filtering launch record equatorward 60°N using only those launches between 23 10 LT, a strong correlation observed mid‐latitude cloud frequency 56° 60°N. Meridional winds 92 km meteorological analysis system reveal morning occurred maximum northward transport. Based upon this combination high plus favorable transport conditions, it likely space traffic has influence clouds.