Comparison of Winds and Temperatures Derived from FPIs at Mid- and Low-Latitudes to HWM- and MSIS-derived Parameters

Mathematics – Logic

Scientific paper

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[2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [3369] Atmospheric Processes / Thermospheric Dynamics

Scientific paper

Two new imaging Fabry-Perot Interferometers (FPIs) have been deployed to measure neutral winds and temperatures from observations of the 630.0-nm thermospheric emission. The FPIs provide accurate estimates of the horizontal neutral wind and temperatures in the early evening when the emission is brightest, with accuracies deteriorating after that time. These two FPIs were initially tested for approximately one year at a field site located near the University of Illinois at Urbana-Champaign. They were then deployed to northeastern Brazil, where they have been operating since September 2009. We present case studies from these two deployments demonstrating the capabilities of these instruments. Additionally, we present monthly averaged data of the winds and temperatures as functions of local time and compare these averages to the results obtained from two versions of the horizontal wind model (HWM93, HWM07) and the most recent version of the Mass-Spectrometer-Incoherent-Scatter model (NRLMSISE-00). These comparisons are used to study the accuracy of the climatological models, especially during the recent deep solar minimum corresponding to the FPI measurements obtained from Brazil.

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