My GeoNetwork catalogue
SWACI - Total Electron Content (TEC) Longitudinal Gradients
SWACI is a research project of DLR supported by the State Government of Mecklenburg-Vorpommern. Radio signals, transmitted by modern communication and navigation systems may be heavily disturbed by space weather hazards. Thus, severe temporal and spatial changes of the electron density in the ionosphere may significantly degrade the signal quality of various radio systems which even may lead to a complete loss of the signal. By providing specific space weather information, in particular now- and forecast of the ionospheric state, the accuracy and reliability of impacted communication and navigation systems shall be improved.
The total electron content (TEC) is defined as the integral of the electron density along the ray path between satellite and receiver. Thus, TEC provides the number of electrons per square meter. The most frequently used unit is 1TECU = 1x1016 electrons / m2.
TEC is derived from dual frequency code and carrier phase measurements provided by Global Navigation Satellite Systems (GNSS). SWACI uses GPS measurements from various European GNSS networks such as the International GNSS Service (IGS), European Reference Frame (EUREF), Norwegian Mapping Authority (NMA), and ascos distributed by the Federal Agency of Cartography and Geodesy (BKG) Frankfurt. The global TEC maps are mainly created by using data provided by the International GNSS Service Real-Time Pilot Project (IGS-RTPP).
To generate TEC maps of vertical TEC, the slant measurements have to be transformed to the vertical. In a first approximation the ionospheric range error in GNSS is proportional to TEC.
These TEC maps are used to derive latitudinal and zonal gradients, rate of change of TEC (5 min increments), 27 days medians, hourly forecasts of TEC, and corresponding error estimates.
Spatial resolution (latitude x longitude): 2 °x 2° (Europe), 2.5° x 5° (globally)
INSPIRE
Identification
- File identifier
- 66f3823d-129b-459f-bacc-d1c04b7fcc35 XML
- Hierarchy level
- Series
Online resource
- Protocol
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WWW:LINK-1.0-http--link
Resource identifier
- Metadata language
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eng
- Spatial representation type
- Grid
Encoding
Projection
- code
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WGS 84 (EPSG:4326)
Classification of data and services
- Topic category
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- Climatology, meteorology, atmosphere
Classification of data and services
Coupled resource
Coupled resource
Classification of data and services
Coupled resource
Coupled resource
Keywords
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GEMET - INSPIRE themes, version 1.0
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Atmospheric conditions
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Other keywords
- Keywords
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urn:eop:DLR:EOWEB:Longitudinal-TEC-Gradients
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SWACI
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total electron content
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Ionosphere
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TEC
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Longitudinal-TEC-Gradients
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Geographic coverage
))
Temporal reference
Temporal extent
- Begin
- 2005-01-24T00:00:00
- End
- 2008-01-30T00:00:00
Temporal extent
- Date (Creation)
- 2015-03-11T00:00:00
Conformity
Conformity
Conformity
Conformity
Conformity
Conformity
- Explanation
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See the referenced specification
Restrictions on access and use
- Use limitation
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Conditional
- Access constraints
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Limited for public use
SWACI License
Responsible organization (s)
Contact for the resource
- Organisation name
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German Aerospace Center (DLR)
- Organisation name
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German Aerospace Center (DLR)
Responsible organization (s)
Contact for the resource
- Organisation name
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German Aerospace Center (DLR)
- Organisation name
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German Aerospace Center (DLR)
Metadata information
Contact for the metadata
- Organisation name
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German Aerospace Center (DLR)
- Date stamp
- 2024-06-20T14:12:12
- Metadata language
- English
- Character set
- UTF8
SDS
Conformance class 1: invocable
Access Point URL
Endpoint URL
Technical specification
Conformance class 2: interoperable
Access constraints
Limitation
Use constraints
Limitation
Responsible custodian
Contact for the resource
Overviews
Spatial extent
Provided by
