BGS Hosted Metadata
Auroral Boundary Derived from IMAGE Satellite Mission Data (May 2000 - Oct 2002)
Auroral oval boundary locations derived from IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) satellite FUV (Far Ultra Violet imager) data covering the period from May 2000 until October 2002. Three sets of boundary data were derived separately from the WIC (Wideband Imaging Camera) and SI12/SI13 (Spectrographic Imager 121.8/135.6 nm) detectors.
For each image, the position of each pixel in AACGM (Altitude Adjusted Corrected Geomagnetic) coordinates was established. Each image was then divided into 24 segments covering 1 hour of magnetic local time (MLT). For each MLT segment, an intensity profile was constructed by finding the average intensity across bins of 1 degree magnetic latitude in the range of 50 to 90 degrees (AACGM).
Two functions were fit to each intensity profile: a function with one Gaussian component and a quadratic background, and a function with two Gaussian components and a quadratic background. The function with a single Gaussian component should provide a reasonable model when the auroral emission forms in a continuous oval. When the oval shows bifurcation, the function with two Gaussian components may provide a better model of the auroral emission. Of the two functions fit to each intensity profile, we determine the one with the lower reduced chi-square goodness-of-fit statistic to be the better model for that profile. For the version 1.1 boundary location data, the fitting process was performed over 200 iterations to achieve each fit.
The auroral boundaries were then determined to be the position of the peak of the poleward Gaussian curve, plus its FWHM (full-width half-maximum) value of the Gaussian, to the peak of the equatorward Gaussian, minus its FWHM. In the case of the single Gaussian fit, the same curve is used for both boundaries.
A number of criteria were applied to discard poorly located auroral boundaries arising from either poor fitting or incomplete data.
A further correction can be applied to the data, to estimate the location of the Earth's magnetic field's OCB (open-close boundary). These corrections have been tabulated in a separate file; if this correction is required the adjustments should be made to the poleward boundary value.
Simple
- Date (Creation)
- 2017-08-29
- Date (Revision)
- 2017-08-29
- Date (Publication)
- 2017-08-29
- Date (released)
- 2017-08-29
- Edition
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None
- Unique resource identifier
- https://doi.org/10.5285/75aa66c1-47b4-4344-ab5d-52ff2913a61e
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/00990
- Codespace
- Other citation details
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Please cite this item as: Chisham, G. (2017). Auroral Boundary Derived from IMAGE Satellite Mission Data (May 2000 - Oct 2002) (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/75aa66c1-47b4-4344-ab5d-52ff2913a61e
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role British Antarctic Survey Chisham, Gareth
Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- This dataset is supplied under the Open Government Licence v3.0: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Larger work citation
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Boundaries
- Climatology, meteorology, atmosphere
- Environment
- Geoscientific information
- Location
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- Supplemental Information
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It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Units of distribution
-
bytes
- Transfer size
- 1
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=75aa66c1-47b4-4344-ab5d-52ff2913a61e Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The data are derived from data taken with the IMAGE satellite. The research accompanies work with SuperDARN radars and ionospheric research at the British Antarctic Survey.
Data quality:
This data is presented as the best available.
Metadata
- File identifier
- 75aa66c1-47b4-4344-ab5d-52ff2913a61e XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2017-08-29
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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