Lidar observations of Ca and K metallic layers from Arecibo and comparison with micrometeor sporadic activity

Details Lidar observations of Ca and K metallic layers from Arecibo and comparison with micrometeor sporadic activity Lidar observations of Ca and K metallic layers from Arecibo and comparison with micrometeor sporadic activity

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..595r&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 6-9, p. 595-606.

Physics

8

Mesospheric Metal Chemistry, Micrometeoroids, Metal Abundance Ratios, Differential Ablation

Scientific paper

We report on the first simultaneous observations of Ca and K metallic layers using the low-latitude lidar systems located at the Arecibo Observatory in Puerto Rico (18.35°N, 66.75°W). We often observe sudden increases in both Ca and K densities during early morning hours on nights where meteor showers take place. During these periods, the Ca/K abundance ratio varied between 2 and 3. On occasion, differences were observed in Ca and K layers, which relate to differences in the chemistry of the two metals. It is known that metallic layers display distinct seasonal variations, but chemistry alone cannot explain the measured differences. Thus, we examined whether or not the seasonal distribution of micrometeoroids, derived from meteor observations using the Arecibo 430MHz radar, can account for the dissimilar metallic observations. We found that the deposition flux of micrometeoroids, with particle sizes ranging between 0.5 and 100μm, increased by a factor of two during the summer as compared with the winter, suggesting a seasonal variation of their sporadic activity. In addition, our data support the idea that differential ablation leads to a depletion of Ca atoms in the mesosphere.

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