Mesospheric Aerosol Sampling Spectrometer

Details Mesospheric Aerosol Sampling Spectrometer Mesospheric Aerosol Sampling Spectrometer

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa21a0251k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA21A-0251

Physics

3311 Clouds And Aerosols, 3349 Polar Meteorology

Scientific paper

An instrument has been developed to detect charged, sub-visible aerosol particles in the polar mesosphere. Two of these instruments were launched in August, 2007 from Andoya, Norway as part of the Mesospheric Aerosol Sampling Spectrometer (MASS) campaign and both detected charged aerosols. These in-situ measurements coincided with measurements by the Aeronomy of Ice in the Mesosphere (AIM) satellite and the German/Norwegian Existence and Charge state Of Meteoric dust grains in the middle Atmosphere (ECOMA) rocket campaign. This instrument has a 25 square centimeter entrance slit that admits a continuous flow of air. Venting ports are placed lower on the detector in order to reduce pressure buildup. The air sample flows between three pairs of graphite electrodes biased symmetrically with increasing bias potentials. Electrons, light ions, cluster ions and heavy charged aerosol particles of both polarities are collected mass-selectively on the electrodes that are connected to sensitive electrometers. Direct Simulation Monte Carlo (DSMC) codes have been used to optimize the supersonic airflow within and around the instrument. The calibration of the MASS instrument as well as preliminary results will be shown. Acknowledgement: This project is supported by NASA.

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