Physics – Optics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa61a03m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA61A-03
Physics
Optics
0310 Airglow And Aurora, 0649 Optics, 2162 Solar Cycle Variations (7536), 2415 Equatorial Ionosphere, 3369 Thermospheric Dynamics (0358)
Scientific paper
The Arequipa Fabry-Perot interferometer (FPI) made frequent determinations of thermospheric winds and temperatures between March and October of the years 1996 to 2000 by measuring the Doppler shift and broadening of the 630 nm nightglow emission (these are an average over its emission region between ~225 and ~300 km). The results showed an increase of the nighttime thermospheric temperature from ~800 - 850 K during solar minimum conditions (1996) to a peak temperature of ~1400 K at solar maximum (2000). Depending on the nightglow brightness, typical measurement errors were 40 to 65 K for measurements lasting 5 to 15 minutes, respectively. The observed variation of the temperature between 20 LT and 05 LT seen in October 1996 showed a midnight temperature maximum (MTM), with an amplitude that varied from ~35 K to ~100 K. Examination of October 1999 results, as well as other months for 1998 and 1999, showed no significant indication of this feature, suggesting that the MTM phenomenon is more strongly manifested during the solar minimum epoch. The observed increase of ~500 - 600 K in the thermospheric temperature for this transition between solar minimum and solar maximum was found to be a linear function of the solar 10.7 cm activity index. Occasional sequential night observations were obtained that showed smooth temperature increases/decreases, probably reflecting changes in solar activity during these periods. Comparisons of the observed results with the predictions of the TIEGCM for solar minimum showed that the model results were lower by about 50 to 100 K.
Biondi Matteo
Emmert John
Fejer Bela
Fesen Cassandra
Meriwether John
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