Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41a..02p&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA41A-02
Physics
0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0340 Middle Atmosphere: Composition And Chemistry, 0355 Thermosphere: Composition And Chemistry
Scientific paper
This paper will begin with an overview of the mesosphere/lower thermosphere (MLT), and the historical role that meteors and the metal layers produced by meteoric ablation have played in understanding the region. The MLT is characterised by enormous seasonal variations in temperature, very low pressures, and is subject to solar radiation extending into the extreme ultra-violet. In addition, more than 50 tonnes of interplanetary dust enters the atmosphere each day, mostly ablating in the MLT region. All of these features contribute to a very unusual chemistry that is quite distinct from the lower atmosphere. Phenomena that will be discussed include: aspects of meteoric ablation; the global layers of metal atoms such as Na and Fe; the Na airglow; sporadic layers of metal ions and neutral atoms; and the role of meteor smoke. I will emphasise the contribution that laboratory studies can make to advancing MLT science, because the region is so difficult to explore directly.
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