Zama T. Katamzi-Joseph
South African National Space Agency
StormIonospherePlasmasphereLatitudeGeologyGeodesyDoppler effectGNSS applicationsSpace weatherMeteorologyMagnetometerSubstormTotal electron contentGeomagnetic stormTECIonosondeSatelliteEarth's magnetic fieldScale (ratio)Environmental scienceClimatologyDepth soundingGeophysicsSunsetAtmospheric sciences
15Publications
4H-index
49Citations
Publications 15
Newest
#1John Bosco Habarulema (South African National Space Agency)H-Index: 16
#2Daniel Okoh (African Institute of Science and Technology)H-Index: 10
Last. Gopi SeemalaH-Index: 2
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Abstract We present a comparison of the ionosphere and plasmasphere total electron content over nearly geomagnetic conjugate locations Pruhonice ( 50.0 ∘ N, 14.6 ∘ E; 45.7 ∘ N geomagnetic), Czech Republic and Hermanus ( 34.4 ∘ S, 19.2 ∘ E; 42.3 ∘ S geomagnetic), South Africa during the low solar activity period of 2009-2010. The bottomside ionosphere, topside ionosphere and plasmaspheric contributions to the total electron content (TEC) derived from the Global Positioning System (GPS) observatio...
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#1Tsige Y. Atilaw (Rhodes University)H-Index: 1
#2Judy A. E. Stephenson (UKZN: University of KwaZulu-Natal)H-Index: 5
Last. Zama T. Katamzi-Joseph (Rhodes University)H-Index: 4
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Abstract A medium-scale travelling ionospheric disturbance (MSTID) was observed concomitantly by SANAE and Halley SuperDARN HF radars during the period 02–06 UT 17 March 2013. The event occurred during a geomagnetically quiet time where no substorm or storm activities were observed. Both radars (at similar geomagnetic latitudes of 61.80S (SANAE) and 62.10S (Halley)) are well placed for observing the sporadic E (Es) region associated with the ionospheric trough around midnight during quiet geomag...
1 CitationsSource
#1John Bosco Habarulema (South African National Space Agency)H-Index: 16
#2Zama T. Katamzi-Joseph (South African National Space Agency)H-Index: 4
Last. Pierre J. Cilliers (South African National Space Agency)H-Index: 18
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This paper focuses on unique aspects of the ionospheric response at conjugate locations over Europe and South Africa during the 7–8 September 2017 geomagnetic storm including the role of the bottomside and topside ionosphere and plasmasphere in influencing electron density changes. Analysis of total electron content (TEC) on 7 September 2017 shows that for a pair of geomagnetically conjugate locations, positive storm effect was observed reaching about 65% when benchmarked on the monthly median T...
6 CitationsSource
#1Nigussie M. Giday (South African National Space Agency)H-Index: 4
#2Zama T. Katamzi-Joseph (South African National Space Agency)H-Index: 4
Last. Russell Stoneback (UTD: University of Texas at Dallas)H-Index: 12
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Abstract Equatorial plasma bubbles (EPBs) are common features of the equatorial and low-latitude ionosphere and are known to cause radio wave scintillation which leads to the degradation of communication and navigation systems. Although these structures have been studied for decades, a full understanding of their evolution and dynamics remains important for space weather mitigation purposes. In this study, we present cases of EPBs occurrences around April and July 2012 geomagnetic storm periods ...
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#2Nicolas BergeotH-Index: 2
Last. Zama T. Katamzi-JosephH-Index: 4
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#1John Bosco Habarulema (South African National Space Agency)H-Index: 16
#2Gabrielle Lefebvre (UM: University of Michigan)H-Index: 1
Last. Endawoke Yizengaw (The Aerospace Corporation)H-Index: 23
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1 CitationsSource
#1Anna BelehakiH-Index: 22
#2Ivan GalkinH-Index: 23
Last. Stefan UngerH-Index: 1
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Travelling Ionospheric Disturbances (TIDs) are ionospheric manifestations of internal atmospheric gravity waves (AGW) in the neutral atmosphere driven by near-Earth space dynamics and by lower atmosphere phenomena. They constitute a threat for operational systems such as precise navigation (e.g., EGNOS and NRTK) and high frequency geolocation as they can impose disturbances with amplitudes of up to ∼20% of the ambient electron density, and Doppler frequency shifts of the order of 0.5 Hz on HF si...
2 CitationsSource
#1Zama T. Katamzi-Joseph (Rhodes University)H-Index: 4
#2Anasuya Aruliah (UCL: University College London)H-Index: 16
Last. Michael Kosch (Lancaster University)H-Index: 25
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Abstract This study reports on observations of large-scale atmospheric gravity waves/traveling ionospheric disturbances (AGWs/TIDs) using Global Positioning System (GPS) total electron content (TEC) and Fabry–Perot Interferometer’s (FPI’s) intensity of oxygen red line emission at 630 nm measurements over Svalbard on the night of 6 January 2014. TEC large-scale TIDs have primary periods ranging between 29 and 65 min and propagate at a mean horizontal velocity of ∼ 749–761 m/s with azimuth of ∼ 34...
1 CitationsSource
#1Jean Claude Uwamahoro (South African National Space Agency)H-Index: 5
#2Nigussie M. Giday (South African National Space Agency)H-Index: 4
Last. Gopi SeemalaH-Index: 2
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5 CitationsSource
#1Tereza SindelarovaH-Index: 6
#2Zbysek MosnaH-Index: 8
Last. Zama T. Katamzi-Joseph (South African National Space Agency)H-Index: 4
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Abstract The ionospheric response to the solar eclipses of 20 March 2015 above the Czech Republic, 9 March 2016 above Taiwan, and 26 February 2017 above South Africa was studied. A distinct bipolar pulse was observed in ionospheric Doppler shift measurements above the Czech Republic (Central Europe) and above Taiwan (Eastern Asia). It is a local phenomenon clearly related with changes of electron density in the ionosphere induced by the passage of the Moon shadow above the measurement sites. The...
1 CitationsSource