BGS Hosted Metadata
Data from the EISCAT UHF and VHF between 2001- 2021, integrated at 10 minutes and 1 hour between 50-200km
We have produced 20-year archives of electron density measurements, at 1 hour and 10-minute integration times, by reanalysing measurements from the EISCAT UHF and VHF radars between 2001-2021. We are specifically looking at altitudes 50-200 km to capture the variability in the Mesosphere Lower Thermosphere Ionosphere (MLT-I) region. We have also separately included power profile data, providing measurements of the raw electron density which can be added (with careful assumptions) to improve data resolution at the lower altitudes.
Funding was provided by NERC project NE/V018426/1 (MesoS2D)
Simple
- Date (Creation)
- 2024-11-08
- Date (Revision)
- 2024-11-08
- Date (Publication)
- 2024-11-08
- Date (released)
- 2024-11-08
- Edition
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1.0
- Unique resource identifier
- https://doi.org/10.5285/7d907fd0-8f08-45a6-ab91-89f6f0221b10
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01942
- Codespace
- Unique resource identifier
- NE/V018426/1
- Codespace
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award
- Other citation details
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Please cite this item as: Reidy, J., Kavanagh, A., & Wild, M. (2025). Data from the EISCAT UHF and VHF between 2001- 2021, integrated at 10 minutes and 1 hour between 50-200km (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/7d907fd0-8f08-45a6-ab91-89f6f0221b10
- 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 Reidy, Jade Author British Antarctic Survey Kavanagh, Andrew Author Rutherford Appleton Laboratory, UK Wild, Matthew
Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Incoherent Scatter Radar (ISR) data
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ionsosphere
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mesosphere
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- Place
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Tromso Norway
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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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Data supplied under Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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None
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url
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- Cross reference
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doi
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- doi
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doi
- Association Type
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- Unique resource identifier
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doi
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doi
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url
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url
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- Larger work citation
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url
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- dependency
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url
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- Cross reference
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url
- Association Type
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- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Climatology, meteorology, atmosphere
)
- Begin date
- 2001-01-01
- End date
- 2021-12-31
Vertical extent
- Minimum value
- 50.0
- Maximum value
- 200.0
Vertical CS
Vertical datum
- 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/x-hdf5
- Units of distribution
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bytes
- Transfer size
- 3006477107
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=7d907fd0-8f08-45a6-ab91-89f6f0221b10 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
We have applied the Grand Unified Incoherent Scatter Design and Analysis Package (GUISDAP) to analyse field aligned and >60 degree elevation experiment data (including scanning experiments) at 10 minute and 1 hour integration times. Different EISCAT experiments with a range of specified pulse codes have been used. GUISDAP fits theoretical incoherent scatter spectra to the log profiles derived from the autocorrelation function of the received radar signal. This produces standard Incoherent Scatter Radar parameters, such as electron density. This is carried out for each altitude step.
We require the integration time to be more than 40 minutes to be included in the 1-hour archive and more than 7 minutes to be included in the 10-minute archive (some experiments do not start/end on the hour for a multitude of reasons including scheduling so for subsequent analysis).
We have used the suggested 'magic constant'/calibration scale factor listed in the calibration tables ( https://eiscat.se/scientist/data/tromso-calibration-tables/). Where these were not available, we went back through the schedule list and manually collected the relevant calibration numbers ( https://portal.eiscat.se/schedule/). Where more than one magic constant were available we preferentially use
foF2, then plasma line, then foE, except for the lower altitude experiments where we used foE.
The power profile or 'raw' electron density data (Nr) comes directly from GUISDAP, these are essentially back-scatter power profiles measured by the radars at zero lag (the EISCAT data are stored as lag profiles (Virtanen et al. 2008) derived from the auto correlation function of the fitted spectra). To identify the altitude where the raw electron density is approximately equal to the fitted electron density, we found the maximum altitude where Ti/Te = 1 (this is an assumption, demonstrated in Figure 9 of Semeter & Kamalabadi (2005)). To find this altitude we smoothed the Ti/Te altitude profiles using a Savizky-Golay filter (Savitzky & Golay 1964), to identify the point where it deviated from 1 +/- 0.1. Where there were more than one power profile per integration period, we have taken a mean of Nr at each altitude below the threshold identified above.
Data collection:
The data from this archive were taken by the UHF (ultra-high frequency) and VHF (very-high frequency) radars, situated in Ramfjordmoen, near Tromso (detailed description in Rishbeth & Williams, 1985)
The UHF consists of a fully steerable, 32 metre parabolic dish and operates at frequencies close to 930 MHz, with a peak power of 2 MW.
The 3 MW VHF radar is a 40 by 120 metre parabolic trough with an elevation range of 15-90deg and an operating frequency of 224 MHz.
The data were analysed using the GUISDAP 9 package, downloaded from: https://gitlab.com/eiscat/guisdap9
Data quality:
Missing values have are represented as NaNs.
Metadata
- File identifier
- 7d907fd0-8f08-45a6-ab91-89f6f0221b10 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
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dataset
- Date stamp
- 2024-11-08
- 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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