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Browsing by Author "Okoh, Daniel"

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Absence of High Frequency Echoes From Ionosondes During the 23–25 April 2023 Geomagnetic Storm; What Happened?

Habarulema, John Bosco; Zhang, Yongliang; Matamba, Tshimangadzo; Buresova, Dalia; Lu, Gang; Katamzi‐Joseph, Zama; Fagundes, Paulo Roberto; Okoh, Daniel; Seemala, Gopi (2024-03)

We report an unusual event on absence of high frequency (HF) echoes in ionosonde observations from the ionospheric F2 region during the geomagnetic storm of 23–25 April 2023. This event was observed in both southern and ...
Assessment of the NeQuick-2 and IRI-Plas 2017 models using global and long-term GNSS measurements

Okoh, Daniel; Onwuneme, Sylvester; Seemala, Gopi K.; Jin, Shuanggen; Rabiu, Babatunde; Nava, Bruno; Uwamahoro, Jean (2018)

The global ionospheric models NeQuick and IRI-Plas have been widely used. However, their uncertainties are not clear at global scale and long term. In this paper, a climatologic assessment of the NeQuick and IRI-Plas models ...
Interhemispheric comparison of the ionosphere and plasmasphere total electron content using GPS, radio occultation and ionosonde observations

Habarulema, John Bosco; Okoh, Daniel; Bergeot, Nicolas; Buresˇova, Dalia; Matamba, Tshimangadzo; Tshisaphungo, Mpho; Katamzi-Joseph, Zama; Pinat, Elisa; Chevalier, Jean-Marie; Seemala, Gopi (2021)

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; ...
New results of ionospheric total electron content measurements from a low-cost global navigation satellite system receiver and comparisons with other data sources

Okoh, Daniel; Obafaye, Aderonke; Rabiu, Babatunde; Seemala, Gopi; Kashcheyev, Anton; Nava, Bruno (2021)

New results of ionospheric Total Electron Content (TEC) measurements obtained from a newly installed low-cost multi-frequency Global Navigation Satellite System (GNSS) U-BLOX receiver at Abuja-Nigeria (Geographic: 8.99 ...
Signatures of Equatorial Plasma Bubbles and Ionospheric Scintillations from Magnetometer and GNSS Observations in the Indian Longitudes during the Space Weather Events of Early September 2017

Vankadara, Ram Kumar; Panda, Sampad Kumar; Amory-Mazaudier, Christine; Fleury, Rolland; Devanaboyina, Venkata Ratnam; Pant, Tarun Kumar; Jamjareegulgarn, Punyawi; Haq, Mohd Anul; Okoh, Daniel; Seemala, Gopi K. (2022)

Scintillation due to ionospheric plasma irregularities remains a challenging task for the space science community as it can severely threaten the dynamic systems relying on space-based navigation services. In the present ...
Storm‐time modeling of the African regional ionospheric total electron content using artificial neural networks

Okoh, Daniel; Habarulema, John Bosco; Rabiu, Babatunde; Seemala, Gopi; Wisdom, Joshua Benjamin; Olwendo, Joseph; Obrou, Olivier; Matamba, Tshimangadzo Merline (2020)

This paper presents the development of a storm‐time total electron content (TEC) model over the African sector for the first time. The storm criterion used was |Dst|≥50 nT and Kp ≥ 4. We have utilized Global Positioning ...

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