|Title||Status of the existing monitoring and forecasts for GNSS systems|
|Author||Nikitina, L; Danskin, D W; Ghoddousi-Fard, R; Prikryl, P|
|Source||Geological Survey of Canada, Open File 7941, 2015, 46 pages, https://doi.org/10.4095/296982 (Open Access)|
|Publisher||Natural Resources Canada|
|Subjects||geophysics; remote sensing; satellites; satellite imagery; navigation systems; magnetic disturbances; magnetic storms; magnetic field; geomagnetism; geomagnetic fields; geomagnetic variations;
ionosphere; ionospheric currents; global positioning system|
|Illustrations||histograms; graphs; diagrams; photographs|
Natural Resources Canada Library - Ottawa (Earth Sciences)
|Program||Northern Canada Geohazards Project, Public Safety Geoscience|
|Released||2015 11 18|
This report is a review of the monitoring and forecasts services for global navigation satellite systems (GNSS) that were publically available on the internet at the end of 2014.
GNSS signals can be affected by ionospheric scintillation and distribution of electron density in the ionosphere caused by space weather disturbances. The intent of this document is to give description of available services and models, which may be
useful in evaluating space weather effects on GNSS. In addition, some models which are available to evaluate the electron density distribution are summarized. A brief background is presented to explain the terminology, methodology and context of the
Based on the review of the existing models we can conclude that
- some models include the long-term variation of the solar activity (like 27 - days variation and 11years solar cycle variation);
- some empirical statistical models
include the solar activity using Sunspot number and F10.7;
- the authors of some TEC models discuss the possibility of including the geomagnetic indices into ionospheric forecast;
- probabilistic models of scintillation could provide an
estimation of the probability of scintillation in the ionosphere based on anticipated/forecasted ionospheric conditions;
- the existing TEC models that include diurnal and seasonal time variation cannot describe disturbances of the ionosphere and
their impact on the GPS systems during space weather events because they are based on typical values assumed in climatology.
The document concludes by considering what services existed at the end of 2014 that may be used to determine if GNSS
signals may be subject to an irregular ionosphere and potential disruption.
|Summary||(Plain Language Summary, not published)|
This report is a review of the monitoring and forecasts services for global navigation satellite systems (GNSS). GNSS signals can be affected by
ionospheric scintillation and distribution of electron density in the ionosphere caused by space weather disturbances. The goal of this document is to provide description of available services and models, which may be useful in evaluating space
weather effects on GNSS.