Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3787m&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 20, p. 3787-3790
Physics
22
Meteorology And Atmospheric Dynamics: Thermospheric Dynamics, Meteorology And Atmospheric Dynamics: Theoretical Modeling, Ionosphere: Ionosphere/Atmosphere Interactions
Scientific paper
A modelling study is presented which investigates in-situ generated changes of the thermosphere and ionosphere during a solar eclipse. Neutral temperatures are expected to drop by up to 40°K at 240 km height in the totality footprint, with neutral winds of up to 26 m/s responding to the change of pressure. Both temperatures and winds are found to respond with a time lag of 30 min after the passing of the Moon's shadow. A gravity wave is generated in the neutral atmosphere and propagates into the opposite hemisphere at around 300 m/s. The combined effects of thermal cooling and downwelling lead to an overall increase in [O], while [N2] initially rises and then for several hours after the eclipse is below the ``steady state'' level. An enhancement of [NmF2] is found and explained by the atmosphere's contraction during, and the reduced [O]/[N2] ratio after the eclipse.
Aylward Alan D.
Lockwood Marian
Müller-Wodarg C. F. I.
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