An impact plume model for atmospheric holes in the FUV dayglow

Details An impact plume model for atmospheric holes in the FUV dayglow An impact plume model for atmospheric holes in the FUV dayglow

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3117b&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 24, p. 3117-3120

Statistics

Computation

4

Planetology: Solar System Objects: Comets

Scientific paper

A transient decrease in FUV dayglow emission from a ~103km2 region of Earth's upper atmosphere is one expected outcome of the collision of a stony meteoroid as small as 50 cm in diameter. Computational models of the entry of projectiles between 210 and 21,000 kg predict the ejection of low-density plumes of air from the stratosphere and mesosphere at velocities of up to 5 km/s. The plumes reach an altitude of over 1000 km, displacing the atomic O-rich thermosphere, and replacing it with photoelectron- and O-poor air from beneath 80 km. The FUV dayglow is normally dominated by O emissions so the plume appears as a dark spot when viewed from above. FUV dayglow holes are reported at rates ~104-106 larger than the impact flux of objects in the size range modeled here, suggesting either 1) the observed rate is greatly overestimated, 2) there is an additional mechanism, or 3) much smaller impactors (which we have not modeled) can also generate FUV darkening plumes.

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