Aerosol Charge Model Consistent with Flight Data from the ECOMA/MASS Rocket Campaign

Details Aerosol Charge Model Consistent with Flight Data from the ECOMA/MASS Rocket Campaign Aerosol Charge Model Consistent with Flight Data from the ECOMA/MASS Rocket Campaign

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa41a1583k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA41A-1583

Computer Science

Sound

[0305] Atmospheric Composition And Structure / Aerosols And Particles, [0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0360] Atmospheric Composition And Structure / Radiation: Transmission And Scattering, [0394] Atmospheric Composition And Structure / Instruments And Techniques

Scientific paper

In August of 2007 two sounding rockets were launched from the Andoya Rocket Range, Norway carrying the MASS instrument (Mesospheric Aerosol Sampling Spectrometer). The instrument detects charged aerosols in four different mass ranges on four pairs of biased collector plates, one set for positive particles and one set for negative particles. The first sounding rocket was launched into PMSE and NLC on 3 August. The solar zenith angle was 93 degrees and NLC were seen in the previous hour at 83 km by the ALOMAR RMR lidar. NLC were also detected at the same altitude by rocket-borne photometer measurements. The data from the MASS instrument shows a negatively charged population with radii >3 nm in the 83-89 km altitude range, which is collocated with PMSE detected by the ALWIN radar. Smaller particles, 1-2 nm in radius with both positive and negative polarity were detected between 86-88 km. Positively charged particles <1 nm in radius were detected at the same altitude. A charging model is developed to investigate the coexistence of positively and negatively charged aerosols in the NLC environment. Natanson’s rate equations are used for the attachment of free electrons and ions and the model includes charging by photo-electron emission and photo-detachment. Although the MASS flight occurred during night time conditions, the solar flux was still significant to affect the charge state of the aerosols. The calculations are done assuming three types of particles with different photo-electron charging properties: 1) Icy NLC particles, 2) Hematite particles of meteoric origin as condensation nuclei, and 3) Hematite particles coated with ice. The charge model results are consistent with the MASS rocket data, displaying both positively and negatively charged aerosols for small radii and only negatively charged particles for large radii.

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