Initial daytime and nighttime SOFDI observations of thermospheric winds from Fabry-Perot Doppler shift measurements of the 630-nm OI line-shape profile

Document Type

Article

Publication Date

9-12-2011

Abstract

In this paper we present both night and day thermospheric wind observations made with the Second-generation, Optimized, Fabry-Perot Doppler Imager (SOFDI), a novel triple-etalon Fabry-Perot interferometer (FPI) designed to make 24-h measurements of thermospheric winds from OI 630-nm emission. These results were obtained from the northeastern United States and from under the magnetic equator at Huancayo, Peru and demonstrate the current instrument capability for measurements of Doppler shifts for either night or day. We found the uncertainties in the measurements agree with expected values based upon forward modeling calculations; nighttime wind components having an uncertainty of ∼20-ms-1 at 30-min resolution and daytime wind components having an uncertainty of ∼70-m s-1 at 20-min resolution. The nighttime uncertainties are typically larger than those seen with traditional single-etalon FPIs, which occur at the cost of being able to achieve daytime measurements. The thermospheric wind measurements from Huancayo replicate recently reported CHAMP zonal winds and are in disagreement with current empirical wind climatologies. In addition, we discuss the incorporation of how multiple point heads in the SOFDI instrument will allow for unique studies of gravity wave activity in future measurements. © Author(s) 2011.

Identifier

80052430265 (Scopus)

Publication Title

Annales Geophysicae

External Full Text Location

https://doi.org/10.5194/angeo-29-1529-2011

e-ISSN

14320576

ISSN

09927689

First Page

1529

Last Page

1536

Issue

9

Volume

29

Grant

0734241

Fund Ref

National Science Foundation

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