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| Titel |
A new automatic method for estimating the peak auroral emission height from all-sky camera images |
| VerfasserIn |
D. K. Whiter, B. Gustavsson, N. Partamies, L. Sangalli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 2, no. 1 ; Nr. 2, no. 1 (2013-03-07), S.131-144 |
| Datensatznummer |
250017758
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| Publikation (Nr.) |
 copernicus.org/gi-2-131-2013.pdf |
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| Zusammenfassung |
| This paper presents a new fully automatic method for quickly finding the
average peak emission height of a single auroral structure from a pair of
all-sky camera images with overlapping fields of view. The peak emission
height of the aurora must be estimated in order to calculate several other
important parameters, such as horizontal spatial scales, optical flow
velocities, and ionospheric electric fields. In most cases the height is not
measured, but a value is assumed, often about 110 km. It is unclear how
accurate this assumption is. A future statistical study of the auroral height
in which the method presented here will be applied to many years of
observations will lead to more accurate assumptions of the height with
quantitative error estimates, and therefore more accurate estimates of
parameters derived using these assumed auroral heights. In the present work
the performance of the new method is compared to another recent automatic
method. It is found that the new method measures the peak emission height
regardless of the shape of the volume emission rate profile, unlike the other
recent method. However, the new method is less suitable than the other method
for analysis of very wide auroral arcs (>30 km) or for aurora in the
magnetic zenith of one of the images. |
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