First simultaneous measurements of Na and K thermospheric layers along with TILs from Arecibo
Abstract
This work presents the first simultaneous observations of Na and K between 120 and 150 km altitudes along with ionospheric tidal ion layers (TILs) obtained on 30 January 2006 data from Arecibo. The latter displays an average downward phase velocity of ~14.7 ms-1. However, the neutral layers descend together at a much slower velocity of about ~0.69 ms-1. This indicates that thermospheric atomic metal layers are not necessarily associated with TILs. The ratio of the average Na/K abundances in thermosphere is ~35.5 as compared to 150 in the main layer (80-105 km). The long lifetimes of ions at ~140 km implies that neutral layers cannot result from direct neutralization of metal ions in the TILs. We investigate different mechanisms that can deposit neutral atoms at thermospheric altitudes.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- December 2015
- DOI:
- 10.1002/2015GL066714
- Bibcode:
- 2015GeoRL..4210106R
- Keywords:
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- mesospheric metals;
- thermospheric metals;
- tidal ion layers