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We present results of electric field measurements made during the MASS  rocket campaign in Andøya, Norway into noctilucent clouds (NLC) and  polar mesospheric summer echoes (PMSE) on 3 August 2007. The  instrument used high input-impedance preamps to measure vertical and  horizontal electric fields. No large-amplitude geophysical electric  fields were detected in the cloud layers, but significant levels of  electric field fluctuations were measured.  Within the cloud layer,  the probe potentials relative to the rocket skin were driven negative  by incident heavy charged aerosols. The amplitude of spikes caused by  probe shadowing were also larger in the NLC/PMSE region. We describe a  method for calculating positive ion conductivities using these  shadowing spike amplitudes and the density of heavy charged aerosols

Electric field measurements in a NLC/PMSE region during the MASS/ECOMA campaign