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Transionospheric Radiolink - Quality Assessment of Ionospheric Correction


Near real-time vertical Total Electron Content (TEC) map for, provided by Ionosphere Monitoring and Prediction Center (IMPC), DLR.

The service "Transionospheric Radioling - Quality Assessment of Ionospheric Correction" aims to provide information on whether standard corrections to GNSS signal are applicable, including for the TEC Core products a-posteriori and estimated parameters and near real-time alarms to indicate the level of degradation of ionospheric correction models with respect to the actual state of the ionosphere. This latter assessment shall be established by considering the update rate for the different service users among the following:

  • Users of GNSS Single frequency services with average accuracy, no integrity (e.g. typical GNSS mass market user)
  • Users of GNSS Single frequency services with average accuracy, using integrity (e.g. EGNOS user)
  • Users or multi-frequency GNSS systems with very high accuracy (e.g. GNSS geodetic users, RTK).

This service is implemented through a combination of products, tools and alerts which can be found through the following tabs along with expert support provided by the teams constituting the SWE Network. Should you require further guidance in the use of this service, or have specific questions about any aspects of the service presented here, don't hesitate to contact the Helpdesk.

The service is implemented through the following set of assets:

  • Ionosphere Monitoring and Prediction Center (IMPC) provided by the German Aerospace Center (DLR);
  • Real-Time Ionosphere Monitor (RTIM) provided by the Norwegian Mapping Authority (NMA);
  • European Ionosonde Service (EIS) provided by National Observatory of Athens (NOA);
  • Ionospheric Scintillation Monitoring (ISM) developed by Collecte Localisation Satellites (CLS) and IEEA;
  • Swarm Utilisation Analysis (SUA) provided by GFZ German Research Centre for Geosciences;
  • ESA/ESOC Ionosphere Monitoring Facility, IONMON.

This service page is curated by the ESC Ionospheric Weather.  For further information, please contact SSCC Help-desk

Overview

Many applications use ionospheric correction models to estimate the ionospheric dependencies. The accurracy of this estimation depends on the actual state of the ionosphere. Degradation of the accurracy occurs during perturbed conditions, e.g. ionospheric storms or scintillations. Therefore, this service provides TEC core products a-posteriori and estimated parameters and near real-time alarms to indicate the level of degradation of ionospheric correction models with respect to the actual state of the ionosphere.

Application

This service will allow users using ionospheric correction models in their applications, to judge the performace at any time. This includes the following types of users:

  • Users of GNSS Single frequency services with average accuracy, no integrity (e.g. typical GNSS mass market user)
  • Users of GNSS Single frequency services with average accuracy, using integrity (e.g. EGNOS user)
  • Users or multi-frequency GNSS systems with very high accuracy (e.g. GNSS geodetic users, RTK)
This services addresses mainly applications using standard corrections to GNSS signals.

Key Products

Near Real Time TEC maps

  • IMPC - Near Real Time TEC maps are provided with global coverage and for the European region. They are provided with 5 minutes latency and 15 minutes temporal resolution. Both products differ in the applied background model. A dedicated European TEC background model allows a higher quality TEC product for the European region. Each TEC map is provided along with a TEC error map.
  • RTIM - Near Real Time TEC maps are high resolution TEC maps for the high-latitude region around the Scandinavian countries (50°N – 80°N, 10°W – 40°E). Since the data coverage is high, no TEC background model is necessary. The temporal resolution is 5 minutes and the spatial resolution is 1° x 1° in latitude and longitude. The quality of the RTIM - TEC maps is presented by the Grid Ionospheric Vertical Error (GIVE) values. The GIVE is an upper bound on 99% of the TEC error.
  • ISM - Near Real Time TEC maps have a global coverage. Their temporal resolution is 1 hour.
  • EIS - Near Real Time TEC maps are derived from ionosonde measurements. Four different maps are produced for the European region each 15 min of the hour: the map of the integrated electron density from 90km to hmF2 (bottomside TEC), the map of the integrated electron density from hmF2 to the transition height (topside TEC), the map of the integrated electron density from the transition height to 20,000km (Plasmaspheric TEC) and the map of the integrated electron density from 90km to20,000 km (TEC). The mapped area extends from -10 °W to 40 °E in longitude and from 34 °N to 60 °N in latitude, and the spatial resolution of the maps is 1°x1°. The product is based on the 3D electron density grids that are calculated using TaD model (Belehaki et al., 2012; Kutiev et al., 2012) in DIAS system. The maps are made available with a latency of 30 min in both ASCII and PNG formats.

TEC and local electron densitiy from Swarm satellites

Valuable data for validation is provided by SUA in form of TEC measurements along the line of sight between Swarm satellites and GNSS satellites. Swarm satellites also deliver the local electron density along the flight paths' of the satellites.

Scintillation measurements

Degradation of ionospheric models and performance of GNSS applications often suffer degradation during ionospheric scintillations. Local scintillation measurements and maps of scintillation parameters are provided in near real-time as follows:

  • S4 and σΦ maps for northern Europe provided by RTIM are based on GNSS measurements from a network of high rate (≥50 Hz) GNSS receivers.
  • S4 and σΦ measurements based on several GNSS high rate (50 Hz) receivers in Europe operated by DLR. The data includes the necessary receiver-satellite-link specific amplitude and phase information.
  • ISM provides global nowcast S4 and σΦ maps based on numerous GNSS receivers (1 Hz) and a few high rate GNSS receivers (50 Hz). Furthermore, it provides forecast of S4 and σΦ maps up to 6 hours ahead. The forecasts are most reliant near the equator and less reliant in polar regions.

EIS - URSI parameters

URSI parameters are derived from ionosonde observations. They help interpreting the ionospheric conditions. URSI parameters are currently provided by the EIS service.

Ionospheric Disturbances

For most users, the degree of perturbation of the ionosphere is of high interest. Currently, this service provides Rate Of change of TEC Index (ROTI) observations. ROTI is related to scintillations. Key products are

  • ROTI maps are provided by IMPC for Europe and by RTIM for FennoScandinavia.
  • Within the RESOSS application, ROTI at the ground is provided. This product shows ROTI for a specified ground receiver location, which is easier to apply for users.
  • Additionally, the SUA activity provides ROT along the flight paths' of the three Swarm satellites.

Solar and geomagnetic indices and measurements

Solar and geomagnetic indices and measurements provide indicators for the source of ionospheric perturbations and performance degradation of ionospheric models.

Contact

For further information, please contact SSCC Help-desk

The following products are associated with this service:

Ionosphere, Nowcast and Archives

Vertical Total Electron Content Map
  • TEC map (Europe), current
     IMPC
  • TEC map (Global), current
     IMPC
  • VTEC maps (northern Europe)
     RTIM
  • Near real-time TEC maps for the European region
     EIS
  • IONMON TEC maps
     IONMON
  • TEC and Err(TEC) nowcast modelled maps
     ISM
  • TEC and Err(TEC) nowcast modelled values at a given location
     ISM
  • Swarm Total Electron Content (TEC)
     SUA
3D Electron Density Grids
  • Swarm electron density (Ne)
     SUA
  • Automated Multi Dataset Analysis (AMDA)
     AMDA
URSI Ionospheric Parameters
  • Nowcast European maps of foF2
     EIS
Scintillation Indices and Parameters
  • S4 maps (northern Europe)
     RTIM
  • σφ maps (northern Europe)
     RTIM
  • Local scintillation indices S4 & σφ Kiruna
     IMPC
  • Local scintillation indices S4 & σφ Neustrelitz
     IMPC
  • Local scintillation indices S4 & σφ Svalbard
     IMPC
  • Local scintillation indices S4 & σφ Tenerife
     IMPC
  • Local scintillation indices S4 & σφ Toulouse
     IMPC
  • S4 and Err(S4) nowcast modelled maps
     ISM
  • SigmaPhi and Err(SigmaPhi) nowcast modelled maps
     ISM
  • S4 and Err(S4) nowcast modelled values at a given location
     ISM
  • SigmaPhi and Err(SigmaPhi) nowcast modelled values at a given location
     ISM

Geomagnetic Indices, Nowcast and Archives

Local External Magnetic Field on Ground
  • Magnetogrammes from North(west) Europe and Greenland
     TGO
  • Real-time and historic geomagnetic activity plots and data files for geomagnetic surveying (total field)
     RESOSS
  • Real-time and historic geomagnetic activity plots and data files for directional drilling (total field, declination and inclination)
     RESOSS
Local Geomagnetic Induced Geoelectric Field
  • Maps for power and pipeline operators
     FMI
  • Table of modelled GIC
     FMI
  • Pipe-to-soil voltage (PSV)
     FMI

Solar Indices, Nowcast and Archives

Solar Flares
  • UGraz/KSO Latest Solar flare detections
  • UGraz/KSO Solar flare detection archive
  • SIDC Solar flare forecast archive
  • SIDC Latest daily space weather bulletin
  • SIDC Daily space weather bulletin archive
Smoothed Sunspot Number (SSN, R12)
  • SIDC/SILSO International sunspot number
  • SIDC/SILSO International sunspot number
  • SSN archive on SEDAT
     SEDAT
Solar Microwave Index (F10.7)
  • SIDC Latest 10.7cm Solar radio flux (F10.7) forecast
  • SIDC 10.7cm Solar radio flux (F10.7) forecast archive
  • Automated Multi Dataset Analysis (AMDA)
     AMDA
  • F10.7 -10.7 -cm radio flux proxy, archive
     SGIArv
Solar X-ray Flux
  • GOES/SEM X-Ray Sensor datasets on SEDAT
     SEDAT
  • Proba2/LYRA Rescaled latest data
  • Proba2/LYRA Rescaled data archive
Solar EUV Integrated Flux
  • Proba2/LYRA Data archive
  • Proba2/LYRA Rescaled data archive
Solar UV Flux

Tools associated with this service:

SWE Data is a web application that provides access to a wide range of Space Weather related data sources covering the areas of the spacecraft, ionospheric, and ground effects. SWE Data allows the user to access all data contained in the repository providing analysis and visualisation tools from these disparate sources.

Following alerts are associated with this service.

Ionospheric Disturbance Detection

Alerts for ionospheric disturbances in the European sector

 EIS

This section provides links to web pages or resources that are not part of the SSA Space Weather Network or esa.int domain.  These sites are not under ESA control and therefore ESA is not responsible for any of the information or links that you may find there. 

Other European Ionosphere Services

Reference documents