Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa41a..07r&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA41A-07
Physics
0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 0360 Radiation: Transmission And Scattering
Scientific paper
Fabry-Perot interferometer (FPI) observations of the 732-nm doublet emission during evening and morning twilights have been made regularly at Arequipa, Peru (16.5 S, 71.4 W) since April, 2005. Arequipa is a site located 4 degrees south of the magnetic equator. Excitation of this emission is a result of the EUV photoionization of [O] to generate the 2P metastable state of O+. Variation of this emission intensity during twilight occurs as the twilight terminator passes through the thermosphere during evening or morning twilights. Consequently, the 732-nm emission intensity is proportional to the [O] abundance illuminated by the Sun along the line-of-sight path from the Arequipa FPI through the thermosphere. Contamination of the FPI spectra by OH mesospheric emissons does appear but can be treated by appropriate scaling and subtraction of the OH emission spectrum. These twilight profiles can be compared with model predictions based upon the MSIS-00 empirical model, and absolute thermospheric [O] densities can be retrieved by comparison with the model predictions. Examination of these twilight profiles during periods of magnetic storm activity will show how the thermospheric [O] density responds to the initiation and recovery of the magnetic storm, and several examples of such behavior will be presented.
Brown Benjamin Lathrop
Meriwether W. Jr. J.
Rogan T.
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