IN SITU MEASUREMENTS OF CHARGED MESOSPHERIC ICE PARTICLES DURING THE PHOCUS 2011 CAMPAIGN AND COMPARISON OF THE RESULTS WITH A MICROPHYSICAL MODEL

摘要

In the summer of 2011 PHOCUS (Particles,Hydrogen and Oxygen Chemistry in the Upper Summer meso-sphere) sounding rocket campaign was conducted at north Swedish ESRANGE. Among other measurements, charged aerosol particles were measured by a classical Faraday cup. These measurements showed a layer of charged aerosol particles around 81.5 km. To interpret the observation model calculations were done to derive the equilibrium temperature of spherical particles. The background temperature was measured in-situ by the CONE instrument on-board the PHOCUS payload. Model calculations show that even very big particles up to 300 nm could exist in the altitude range of the observed ice particle layer. Also, equilibrium temperature of meteor dust particles were calculated for different materials. These calculations show that dust particles with a high relative content of iron are much warmer than other materials. The model calculations also show that dust particles with a high relative iron content are inefficient condensation nuclei for mesospheric ice.