Metal atoms observed in the thermosphere over Arecibo

Details Metal atoms observed in the thermosphere over Arecibo Metal atoms observed in the thermosphere over Arecibo

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41c..03f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41C-03

Physics

[0341] Atmospheric Composition And Structure / Middle Atmosphere: Constituent Transport And Chemistry, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [3332] Atmospheric Processes / Mesospheric Dynamics, [3360] Atmospheric Processes / Remote Sensing

Scientific paper

We report a lidar observation of a thermospheric neutral potassium (K) layer extending from 115 km to ~155 km at the Arecibo Observatory in March 2005. Prior to the occurrence of this layer, a gravity wave event was observed in the mesospheric K layer between 82 and 98 km. The wave, of approximately 2-h period, modulated the metal layer abundance by over 25% and temperatures by about 5 K throughout the night of 11-12 March 2005. Then, in the early morning hours, neutral K atoms were observed descending through the thermosphere starting above 150 km, to our knowledge higher than ever before observed, with a peak density of nearly 1 atom/cc. We present the analysis of this fascinating event and invesigate whether there is any connection between the strong wave activity near 100 km and the descending concentration of K. We also report on correlative observations of the state of the ionosphere that may explain the existence of neutral metals at such an extreme altitude.

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