Seasonal and Diurnal Variation of Electron and Iron Densities in the MLT Region Above Arecibo

Details Seasonal and Diurnal Variation of Electron and Iron Densities in the MLT Region Above Arecibo Seasonal and Diurnal Variation of Electron and Iron Densities in the MLT Region Above Arecibo

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0264z&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0264

Mathematics

Logic

0300 Atmospheric Composition And Structure, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0355 Thermosphere: Composition And Chemistry

Scientific paper

A climatological study was performed to compare local time variation of the averaged electron and iron concentration observed at the Arecibo Observatory (18.35°N, 66.75°N) Puerto Rico. The average Fe profile between 21:00 to 24:00 LT has a single peak at about 85 km with the exception of the summer when an additional peak exists at about 95 km. It is observed that the higher Fe peak in the summer is correlated with higher electron concentrations in this season. Comparison of Fe and electron concentrations suggests that recombination of Fe+ plays an important role in determining the Fe profile in the upper part of the Fe layer. Above 93 km, the Fe concentration appears to increase after sunset if the electron concentration exceeds about 4000 electrons cm-3. The average rate of Fe production is about 0.1 atom cm-3 s-1 for all seasons at 100 km in the early evening hours. A chemical model reveals that the concentration of Fe+ must be 50 to 80 % of the total ionization over Arecibo for typical equinox conditions to explain the observed rate of Fe production. These high relative Fe+ concentrations are consistent with in situ observations that Fe+ is usually the dominant ion in sporadic E layers in the nighttime lower E region. This suggests that the source of Fe+ is provided by sporadic E layers descending over Arecibo after sunset.

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