A Study of Meteoric Smoke Parameters Derived From Arecibo D-region ISR Spectra in Different Seasons

Details A Study of Meteoric Smoke Parameters Derived From Arecibo D-region ISR Spectra in Different Seasons A Study of Meteoric Smoke Parameters Derived From Arecibo D-region ISR Spectra in Different Seasons

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1579f&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1579

Physics

2461 Plasma Interactions With Dust And Aerosols (7849)

Scientific paper

In this work we present a seasonal study of the presence and characteristics of meteoric smoke particles (MSPs) in the D-region plasma derived from observations using the 430 MHz dual-beam Arecibo Observatory (AO) incoherent scatter radar (ISR) in Puerto Rico (18° N, 67° W). MSPs are believed to be the major source of condensation nuclei for the formation of ice particles, the precursor for Polar Mesospheric Clouds (PMCs). Our results are obtained by utilizing a method similar to one developed by Strelnikova et al. [2007, Meteor smoke particle properties derived from Arecibo incoherent scatter radar observations, GRL (35)15] who fitted a summed Lorentzian function to the ISR power spectra in order to derive the MSP sizes and number densities. This method allows us to determine mean particle radii and densities in the 80 - 95 km altitude range during the hours of 10 - 14 AO LT when the detected signal-to-noise (SNR) from the D-region is strongest. Our results provide insight into the presence and distribution of positively charged meteoric dust in the mesosphere resulting from the condensation of ablated meteoric material. Furthermore, we investigate the existence of any correlation between the seasonal variations of the derived MSPs properties with that of the meteoric input function (MIF) in the MLT above Arecibo.

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