BGS Hosted Metadata
Dominant spatial and temporal patterns of horizontal ionospheric plasma velocity variation covering the northern polar region, for the period 1997.0 to 2009.0
We present a reanalysis of SuperDARN plasma velocity measurements, using the method of data-interpolating Empirical Orthogonal Functions (EOFs). The northern polar region's radar-measured line of sight Doppler velocities are binned in an equal-area grid (areas of approximately 110,000km2) in quasi-dipole latitude and quasi-dipole magnetic local time (MLT). Within this spatial grid, which extends to 30 degrees colatitude, the plasma velocity is given in terms of cardinal north and east vector components (in the quasi-dipole coordinate frame), with the median of every SuperDARN measurement in the spatial bin taken every 5 minutes. These sparse binned data are infilled to provide a measurement at every spatial and temporal location via EOF analysis, ultimately comprising a series of monthly reanalyses, from 1997.0 to 2009.0. This resource provides a convenient method of using SuperDARN data without its usual extreme sparseness, for studies of ionospheric electrodynamics during solar cycle 23. The reanalyses are provided in monthly sets of orthogonal modes of variability (spatial and temporal patterns), along with the timestamps of each epoch, and the spatial coordinate information of all bin locations. We also provide the temporal mean of the data in each spatial bin, which is removed prior to the EOF analysis.
Funding was provided by the NERC grant NE/N01099X/1.
***** PLEASE BE ADVISED TO USE VERSION 2.0 DATA *****
This version (1.0) has an error in radar data processing that the new version corrects. This is available via the 'Related Data Set Metadata' link below
Simple
- Date (Creation)
- 2019-06-17
- Date (Revision)
- 2019-06-17
- Date (Publication)
- 2019-06-17
- Date (released)
- 2019-06-17
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/8db4c41b-e549-45dd-bc85-386e6e0e6e07
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01159
- Codespace
- Unique resource identifier
- NE/N01099X/1
- Codespace
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award
- Other citation details
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Please cite this item as: Shore, R., & Freeman, M. (2020). Dominant spatial and temporal patterns of horizontal ionospheric plasma velocity variation covering the northern polar region, for the period 1997.0 to 2009.0 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/8db4c41b-e549-45dd-bc85-386e6e0e6e07
- 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 Shore, Robert Author British Antarctic Survey Freeman, Mervyn Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Data Interpolating Empirical Orthogonal Functions
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Ionosphere electrodynamics
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Plasma velocity
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Polar electric field
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SuperDARN reanalysis
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- Place
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Northern polar region of the Earths ionosphere Arctic
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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
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/
- Use constraints
- Other restrictions
- Other constraints
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This data is governed by the NERC data policy and supplied under Open Government Licence v.3
- Use constraints
- Other restrictions
- Other constraints
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The data has been superseded by version 2. Version 1 is available on request only.
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Unique resource identifier
- doi
- Codespace
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doi
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Climatology, meteorology, atmosphere
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- Begin date
- 1997-01-01
- End date
- 2008-12-31
- 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
- Distributor format
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Name Version application/netcdf
- Units of distribution
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bytes
- Transfer size
- 276824064
- 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=8db4c41b-e549-45dd-bc85-386e6e0e6e07 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The data were gathered using the northern hemisphere radars of the SuperDARN global array, and the fitted Doppler velocities were processed from the original autocorrelation functions using version 4.0 of the radar software toolkit (RSTv4.0) and within that toolkit, fitting routine 'fitacfv2.5'.
The method will be described in full in a paper ('A high-resolution model of the ionospheric convection from eigenanalysis of SuperDARN plasma velocities'), presently in prep.
Data collection:
See lineage/methodology for SuperDARN data processing programs. Note that the programs used to process this data are works in progress and will be published in the supporting information of the referenced paper.
Data quality:
The SuperDARN data were processed to remove ground scatter, and to eliminate measurements with too low power (lower than 3dB), or which had a poor-quality flag (identified in RSTv4.0). When binning the data, range gates below 11 and above 150 (where those values correspond to multiple of 45 km range distance from the radar array location) were not used, since these gave inaccurate locational estimates.
Resolution: The bins are of equal area , each 110,000 km2, chosen to maximize the invariant latitudinal resolution while satisfying that there is at least one station contributing to each bin.
Metadata
- File identifier
- 8db4c41b-e549-45dd-bc85-386e6e0e6e07 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2019-06-17
- 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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