24 publication(s) trouvée(s)
Article scientifique
Investigation of the relationship between the spatial gradient of total electron content (TEC) between two nearby stations and the occurrence of ionospheric irregularities
Abstract. The relation between the occurrence of ionospheric irregularities and the spatial gradient of total electron content (TEC) derived from …
Article scientifique
Estimating satellite and receiver differential code bias using a relative Global Positioning System network
Abstract. Precise total electron content (TEC) is required to produce accurate spatial and temporal resolution of global ionosphere maps (GIMs). …
Article scientifique
Investigation of the behavior of the atmospheric dynamics during occurrences of the ozone hole's secondary effect in southern Brazil
Abstract. The Antarctic ozone hole (AOH) directly influences the Antarctic region, where its levels can reach values below 220 DU. …
Article scientifique
Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa
Abstract. The correlation between solar ultraviolet radiation (UV) and atmospheric ozone is well understood. Decreased stratospheric ozone levels which led …
Article scientifique
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event
Abstract. A study of the response of some ionospheric parameters and their relationship in describing the behaviour of ionospheric mechanisms …
Article scientifique
Modeling of GPS total electron content over the African low-latitude region using empirical orthogonal functions
Abstract. In this paper, an empirical total electron content (TEC) model and trends in the TEC over the African low-latitude …
Article scientifique
Evaluation of the NeQuick model performance under different geomagnetic conditions over South Africa during the ascending phase of the solar cycle (2009–2012)
Abstract. In order to provide a scientific base to the NeQuick characterisation under disturbed conditions, the comparison of its performance …
Article scientifique
Ionospheric and thermospheric response to the 27–28 February 2014 geomagnetic storm over north Africa
Abstract. The present work explores the ionospheric and thermospheric responses to the 27–28 February 2014 geomagnetic storm. For the first …
Article scientifique
Statistical analysis of the correlation between the equatorial electrojet and the occurrence of the equatorial ionisation anomaly over the East African sector
Abstract. This study presents statistical quantification of the correlation between the equatorial electrojet (EEJ) and the occurrence of the equatorial …
Article scientifique
New results on the mid-latitude midnight temperature maximum
Abstract. Fabry–Perot interferometer (FPI) measurements of thermospheric temperatures and winds show the detection and successful determination of the latitudinal distribution …
Article scientifique
Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015
Abstract. Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 …
Article scientifique
Studying the variability in the diurnal and seasonal variations in GPS total electron content over Nigeria
Abstract. The study of diurnal and seasonal variations in total electron content (TEC) over Nigeria has been prompted by the …
Article scientifique
Determinations of ionosphere and plasmasphere electron content for an African chain of GPS stations
Abstract. The confluence of recent instrumentation deployments in Africa with developments for the determination of plasmasphere electron content using Global …
Article scientifique
Errors in wind resource and energy yield assessments based on the Weibull distribution
Abstract. The methodology used in wind resource assessments often relies on modeling the wind-speed statistics using a Weibull distribution. In …
Article scientifique
Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet
Abstract. We examined the longitudinal variability of the equatorial electrojet (EEJ) and the occurrence of its counter electrojet (CEJ) using …
Article scientifique
Ionospheric response to magnetar flare: signature of SGR J1550–5418 on coherent ionospheric Doppler radar
Abstract. This paper presents observational evidence of frequent ionospheric perturbations caused by the magnetar flare of the source SGR J1550–5418, …
Article scientifique
New results on equatorial thermospheric winds and temperatures from Ethiopia, Africa
Abstract. Measurements of equatorial thermospheric winds, temperatures, and 630 nm relative intensities were obtained using an imaging Fabry–Perot interferometer (FPI), …
Article scientifique
MONITOR Ionospheric Network: two case studies on scintillation and electron content variability
Abstract. The ESA MONITOR network is composed of high-frequency-sampling global navigation satellite systems (GNSS) receivers deployed mainly at low and …
Article scientifique
Signature of ionospheric irregularities under different geophysical conditions on SBAS performance in the western African low-latitude region
Abstract. Rate of change of TEC (ROT) and its index (ROTI) are considered a good proxy to characterize the occurrence …
Article scientifique
Induction effects of geomagnetic disturbances in the geo-electric field variations at low latitudes
Abstract. In this study we examined the influences of geomagnetic activity on the Earth surface electric field variations at low …
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