Fabry-Perot Observations of a Secondary Peak at 20-21 Local Time in the Nocturnal Thermospheric Temperature Variation at Arequipa, Peru (16.5S, 71.5 W)

Details Fabry-Perot Observations of a Secondary Peak at 20-21 Local Time in the Nocturnal Thermospheric Temperature Variation at Arequipa, Peru (16.5S, 71.5 W) Fabry-Perot Observations of a Secondary Peak at 20-21 Local Time in the Nocturnal Thermospheric Temperature Variation at Arequipa, Peru (16.5S, 71.5 W)

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa73a..07m&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA73A-07

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves

Scientific paper

Fabry-Perot observations of the nighttime thermospheric temperature variation in the equatorial region at Arequipa, Peru (16.5 S, 71.5 W) have generally reported the detection of a midnight temperature maximum (MTM). Examination of Arequipa temperature observations for the period of 1997 to 2001 as compared with the NRL MSIS-00 empirical model also reveals the occasional appearance of a secondary temperature peak with an amplitude of 15 to 25 K in contrast to the MTM amplitude of typically 75 to 150 K. This feature is seen near 20-21 LT for perhaps 15 to 25% of the ~400 nights of winter and equinoctial observations between 1997 and 2001. There was no strong solar cycle phase dependence noted for these results. Detection was possible only when the Fabry-Perot observations in all directions were averaged to decrease the measurement error from a typical value of 40-50 K to 15-20 K. Modelling using the Whole Atmosphere Model demonstrates the detection of a similar peak near 20-21 LT in the nighttime thermal variation. The development of this peak occurs as the result of the thermal forcing by the tidal waves propagating upward from the lower thermosphere for which the multiple tidal harmonics interact with the diurnal variation of the thermospheric ion drag to produce the MTM and also sporadically, this secondary temperature peak.

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