Analysis of a grid ionospheric vertical delay and its bounding errors over West African sub-Saharan region. Abe, O. E., Otero Villamide, X., Paparini, C., Radicella, S. M., & Nava, B. 154:67–74.
Analysis of a grid ionospheric vertical delay and its bounding errors over West African sub-Saharan region [link]Paper  doi  abstract   bibtex   
Investigating the effects of the Equatorial Ionization Anomaly (EIA) ionosphere and space weather on Global Navigation Satellite Systems (GNSS) is very crucial, and a key to successful implementation of a GNSS augmentation system (SBAS) over the equatorial and low-latitude regions. A possible ionospheric vertical delay (GIVD, Grid Ionospheric Vertical Delay) broadcast at a Ionospheric Grid Point (IGP) and its confidence bounds errors (GIVE, Grid Ionospheric Vertical Error) are analyzed and compared with the ionospheric vertical delay estimated at a nearby user location over the West African Sub-Saharan region. Since African sub-Saharan ionosphere falls within the EIA region, which is always characterized by a disturbance in form of irregularities after sunset, and the disturbance is even more during the geomagnetically quiet conditions unlike middle latitudes, the need to have a reliable ionospheric threat model to cater for the nighttime ionospheric plasma irregularities for the future SBAS user is essential. The study was done during the most quiet and disturbed geomagnetic conditions on October 2013. A specific low latitude EGNOS-like algorithm, based on single thin layer model, was engaged to simulate SBAS message in the study. Our preliminary results indicate that, the estimated GIVE detects and protects a potential SBAS user against sampled ionospheric plasma irregularities over the region with a steep increment in GIVE to non-monitored after local sunset to post midnight. This corresponds to the onset of the usual ionospheric plasma irregularities in the region. The results further confirm that the effects of the geomagnetic storms on the ionosphere are not consistent in affecting GNSS applications over the region. Finally, this paper suggests further work to be investigated in order to improve the threat integrity model activity, and thereby enhance the availability of the future SBAS over African sub-Saharan region.
@article{abe_analysis_2017,
	title = {Analysis of a grid ionospheric vertical delay and its bounding errors over West African sub-Saharan region},
	volume = {154},
	issn = {1364-6826},
	url = {http://www.sciencedirect.com/science/article/pii/S1364682616304692},
	doi = {10.1016/j.jastp.2016.12.015},
	abstract = {Investigating the effects of the Equatorial Ionization Anomaly ({EIA}) ionosphere and space weather on Global Navigation Satellite Systems ({GNSS}) is very crucial, and a key to successful implementation of a {GNSS} augmentation system ({SBAS}) over the equatorial and low-latitude regions. A possible ionospheric vertical delay ({GIVD}, Grid Ionospheric Vertical Delay) broadcast at a Ionospheric Grid Point ({IGP}) and its confidence bounds errors ({GIVE}, Grid Ionospheric Vertical Error) are analyzed and compared with the ionospheric vertical delay estimated at a nearby user location over the West African Sub-Saharan region. Since African sub-Saharan ionosphere falls within the {EIA} region, which is always characterized by a disturbance in form of irregularities after sunset, and the disturbance is even more during the geomagnetically quiet conditions unlike middle latitudes, the need to have a reliable ionospheric threat model to cater for the nighttime ionospheric plasma irregularities for the future {SBAS} user is essential. The study was done during the most quiet and disturbed geomagnetic conditions on October 2013. A specific low latitude {EGNOS}-like algorithm, based on single thin layer model, was engaged to simulate {SBAS} message in the study. Our preliminary results indicate that, the estimated {GIVE} detects and protects a potential {SBAS} user against sampled ionospheric plasma irregularities over the region with a steep increment in {GIVE} to non-monitored after local sunset to post midnight. This corresponds to the onset of the usual ionospheric plasma irregularities in the region. The results further confirm that the effects of the geomagnetic storms on the ionosphere are not consistent in affecting {GNSS} applications over the region. Finally, this paper suggests further work to be investigated in order to improve the threat integrity model activity, and thereby enhance the availability of the future {SBAS} over African sub-Saharan region.},
	pages = {67--74},
	journaltitle = {Journal of Atmospheric and Solar-Terrestrial Physics},
	shortjournal = {Journal of Atmospheric and Solar-Terrestrial Physics},
	author = {Abe, O. E. and Otero Villamide, X. and Paparini, C. and Radicella, S. M. and Nava, B.},
	urldate = {2020-01-27},
	date = {2017-02-01},
	langid = {english},
	keywords = {{EIA} Ionosphere, {GIVD}, {GIVE}, {IGP}, Plasma irregularities, {SBAS}, West African sub-Saharan region}
}

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