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Issues in Quantitative Analysis of Ultraviolet Imager (UV) Data: AirglowThe GGS Ultraviolet Imager (UVI) has proven to be especially valuable in correlative substorm, auroral morphology, and extended statistical studies of the auroral regions. Such studies are based on knowledge of the location, spatial, and temporal behavior of auroral emissions. More quantitative studies, based on absolute radiometric intensities from UVI images, require a more intimate knowledge of the instrument behavior and data processing requirements and are inherently more difficult than studies based on relative knowledge of the oval location. In this study, UVI airglow observations are analyzed and compared with model predictions to illustrate issues that arise in quantitative analysis of UVI images. These issues include instrument calibration, long term changes in sensitivity, and imager flat field response as well as proper background correction. Airglow emissions are chosen for this study because of their relatively straightforward modeling requirements and because of their implications for thermospheric compositional studies. The analysis issues discussed here, however, are identical to those faced in quantitative auroral studies.
Document ID
19990069911
Document Type
Reprint (Version printed in journal)
Authors
Germany, G. A. (Alabama Univ. Huntsville, AL United States)
Richards, P. G. (Alabama Univ. Huntsville, AL United States)
Spann, J. F. (NASA Marshall Space Flight Center Huntsville, AL United States)
Brittnacher, M. J. (Washington Univ. Seattle, WA United States)
Parks, G. K. (Washington Univ. Seattle, WA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Geophysics
Distribution Limits
Public
Copyright
Other