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The ECOMA series of rocket payloads use a set of aerosol particle, plasma,  and optical instruments to study the properties of aerosol particles and  their interaction with the ambient plasma environment in the polar mesopause  region.  In August 2007 the ECOMA-3 payload was launched into a region with Polar  Mesosphere Summer Echoes (PMSE) and noctilucent clouds (NLC).  An electron  depletion was detected in a broad region between 83 and 88 km, coincident  with enhanced density of negatively charged aerosol particles.  We also find  evidence for positive ion depletion in the same region.  Charge neutrality  requires that a population of positively charged particles smaller than 2 nm  and with a density of at least 2×10<sup>8</sup> m<sup>−3</sup> must also have been  present in the layer, undetected by the instruments.  A numerical model for  the charging of aerosol particles and their interaction with the ambient  plasma is used to analyse the results, showing that high aerosol  particle densities are required in order to explain the observed ion density  depletion.  The model also shows that a very high photoionisation rate is  required for the particles smaller than 2 nm to become positively charged,  indicating that these may have a lower work function than pure water ice

The ECOMA 2007 campaign: rocket observations and numerical modelling of aerosol particle charging and plasma depletion in a PMSE/NLC layer