47
Publications
244
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0
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Astronomie
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Astrophysique
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Cosmologie
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Sciences planétaires
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Publications
47 publication(s) trouvée(s)
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
Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions
Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems …
Article scientifique
An Idealized Method of Simulating Residual Ionospheric Errors in Radio Occultation
Abstract An idealized model is used to simulate radio occultation bending angles and residual ionospheric errors. The test results of …
Article scientifique
The AGN Nature of LINER Nuclear Sources
Low-ionization nuclear emission-line regions (LINERs) are specially interesting objects since not only they represent the most numerous local Active Galactic …
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
Legal Challenges Relating to the Commercial Use of Outer Space, with Specific Reference to Space Tourism
Since the launch of the first artificial satellite, Sputnik 1 in 1957, the outer space arena has evolved to include …
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
Wave-particle energy exchange directly observed in a kinetic Alfvén-branch wave
Alfvén waves are fundamental plasma wave modes that permeate the universe. At small kinetic scales, they provide a critical mechanism …
Article scientifique
Cosmic metaphysics: Being versus Becoming in cosmology and astrophysics
This article offers a critical discussion on the question of the existence of the Universe, starting with creation myths of …
Article scientifique
PMSE long term observations using SuperDARN SANAE HF radar measurements
It is known that the presence of nanometre-scale ice particles and neutral air turbulence in the Polar summer mesosphere modify …
Article scientifique
Rupestrian World Heritage Sites: Instability Investigation and Sustainable Mitigation
Rupestrian settlements were among the first man-made works in the history of humanity. The most relevant masterpieces of such human …
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 …
Article scientifique
Climatology of thermospheric neutral winds over Oukaïmeden Observatory in Morocco
Abstract. In order to explore coupling between the thermosphere and ionosphere and to address the lack of data relating to …
Article scientifique
Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum
Abstract. In this work, we investigated the veracity of an ion continuity equation in controlling equatorial ionization anomaly (EIA) morphology …
Article scientifique
Scintillation measurements at Bahir Dar during the high solar activity phase of solar cycle 24
Abstract. Small-scale ionospheric disturbances may cause severe radio scintillations of signals transmitted from global navigation satellite systems (GNSSs). Consequently, small-scale …