Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1555m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1555
Physics
0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 3369 Thermospheric Dynamics (0358)
Scientific paper
Fabry-Perot temperature measurements obtained at Arequipa, Peru (-16.5 S, 74 W) during the period of solar maximum activity in 1999-2001 during the fall-winter-spring period of April to October occasionally exhibited a secondary peak enhancement of 10 to 40 K amplitude in addition to the more normal midnight temperature maximum enhancement of 50 to 150 K. Temperature measurements obtained for each cycle of directions (N,E,S,W, and Z) were averaged to reduce the standard deviation of the error from 40-65 K for each point to 20-35 K. A total of about 20 nights exhibits such peaks as well as the MTM feature. These peaks were seen in the period prior to local midnight generally within one or two hours after evening twilight. The results of observations from 1999 to 2001 will be reviewed to obtained an estimate of the statistical rate of appearance of these secondary peaks. Data obtained during the recent solar minimum period will be discussed in regard to possible secondary peak detection. It is proposed that the these temperature enhancements may be attributed to the density wave associated with the motion of the solar terminator wave through the thermosphere as described by the recent work of Forbes and collaborators reporting on the analysis of CHAMP data.
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