32 publication(s) trouvée(s)
Article scientifique
Modulation of cosmic-ray ground-level enhancements by solar-wind stream interfaces: a case study
Ground-level enhancements (GLEs) provide crucial insights into the acceleration and transport of solar energetic particles (SEPs). We present a comprehensive …
Article scientifique
Cloudiness retrieved from All-Sky camera and MSG satellite over Reunion Island and Antananarivo Madagascar
To gain a deeper understanding of cloud variability over the Southwest Indian Ocean (SWIO) region, various measurement techniques can be …
Article scientifique
Investigating the role of gravity waves in mesosphere and lower-thermosphere (MLT) inversions at low latitudes
The mesosphere and lower-thermosphere (MLT) transitional region, encompassing a height range of 60–100 km, is a distinct and highly turbulent …
Article scientifique
Low-frequency solar radio type II bursts and their association with space weather events during the ascending phase of solar cycle 25
Type II solar radio bursts are signatures of the coronal shocks and, therefore, particle acceleration events in the solar atmosphere …
Article scientifique
Ionospheric upwelling and the level of associated noise at solar minimum
We have studied the ionospheric upwelling with a magnitude of above 10 13 m −2 s −1 using the data …
Article scientifique
Modeling total electron content derived from radio occultation measurements by COSMIC satellites over the African region
Abstract. This study developed a model of total electron content (TEC) over the African region. The TEC data were obtained …
Article scientifique
Comparison of quiet-time ionospheric total electron content from the IRI-2016 model and from gridded and station-level GPS observations
Abstract. Earth's ionosphere is an important medium of radio wave propagation in modern times. However, the effective use of the …
Article scientifique
Traits of sub-kilometre F-region irregularities as seen with the Swarm satellites
Abstract. During the night, in the F-region, equatorial ionospheric irregularities manifest as plasma depletions observed by satellites, and they may …
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 …
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