Total electron content of the ionosphere at two stations in East Africa during the 24–25 October 2011 geomagnetic storm

D’ujanga, Florence Mutonyi; Baki, P.; Olwendo, Joseph; Twinamasiko, B.F.

doi:10.1016/j.asr.2012.09.040

Cited by 38 publications

(19 citation statements)

References 21 publications

(45 reference statements)

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“…An increase of h m F 2 and F region thickness together with a preservation of f o F 2 means an increase of the total electron content. However, there were large TEC depletions at equatorial latitudes probably due to eastward penetration electric fields [ D'ujanga et al ., ]. From Figure it also can be observed that Hm increased an average of 30 kilometers with respect to a quiet day from 21:50 to 07:45 UT on 25 October 2011.…”

Section: Effects On the Earth's Environmentmentioning

confidence: 77%

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Space weather effects on Earth's environment associated to the 24–25 October 2011 geomagnetic storm

et al. 2013

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[1] Space weather studies have increased due to human society dependence on spaceborne and terrestrial infrastructure vulnerable to its effects. In this paper, we present an interdisciplinary study of the effects of solar activity on the Earth's environment; specifically, we focus on the effects on the ionosphere and the geomagnetic field. A timeline of effects occurring on the Earth produced by one of the first relevant events of the present solar cycle (24-25 October 2011) is given. We have analyzed the solar wind shockwave from satellite data, the storm-time development, the ionospheric effects at global and local scales using the National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General Circulation Model fed with geomagnetic field-aligned current data from the Active Magnetosphere and Planetary Electrodynamics Response Experiment, and ground ionosonde data from both hemispheres, at Ebre Observatory and Port Stanley locations. We have compared observed geomagnetic variations at high latitudes with those modeled by the National Center for Atmospheric Research Thermosphere-Ionosphere-Electrodynamics General Circulation Model. We have analyzed rapid geomagnetic variations (e.g., solar flare effect, storm commencement, Pi2) also on both hemispheres, at Ebre Observatory and Livingston Island locations. Finally, we have estimated geoelectric field and geomagnetically induced currents in the northeast of Spain (Catalonia) produced by this geomagnetic disturbance.

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Section: Effects On the Earth's Environmentmentioning

confidence: 77%

“…They are probably related to large‐scale travelling ionospheric disturbances generated at high latitudes during the geomagnetic storm. Significant fluctuations in TEC at equatorial latitudes were also observed [ D'ujanga et al ., ].…”

Section: Effects On the Earth's Environmentmentioning

confidence: 99%

Space weather effects on Earth's environment associated to the 24–25 October 2011 geomagnetic storm

et al. 2013

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“…In 2011, there have been nine geomagnetic storms, whereas, in 2015, there are 13 storms as given in Table . Some of these storms are well documented in the literature such as 24–26 October 2011 (Akala et al, ; Blanch et al, ; D'ujanga et al, ) and St. Patrick Day storm (Astafyeva et al, ; Nava et al, ; Nayak et al, ; Wu et al, ).…”

Section: Description Of Data and Comparison Methodsmentioning

confidence: 97%

“…In 2011, there have been nine geomagnetic storms, whereas, in 2015, there are 13 storms as given in Table 2. Some of these storms are well documented in the literature such as 24-26 October 2011 (Akala et al, 2013;Blanch et al, 2013;D'ujanga et al, 2013) For each available ionosonde and for each data sample date and time, IRI-2016 is run. The foF2 values are obtained for every option of CCIR or URSI foF2/NmF2; STORM option ON or OFF.…”

Section: Description Of Data and Comparison Methodsmentioning

confidence: 99%

Comparison of IRI‐2016 F2 Layer Model Parameters with Ionosonde Measurements

2019

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International Reference Ionosphere (IRI) is the international standard ionospheric climatic model. Since the original formation of the international task force in 1970s, the IRI model has been continuously improved by ingesting developments in research in ionosphere. The most current version, namely, IRI‐2016, is offered with International Radio Consultative Committee (CCIR) and International Union of Radio Science (URSI) model choices with “STORM” option for the F2 layer critical plasma frequency (foF2) and BSE‐1979, AMTB‐2013, and SHU‐2015 options for maximum ionization height, hmF2. Since these two parameters are the determining values for the other model outputs, the evaluation of the options offered by IRI‐2016 is critical for various applications. In this study, all foF2 and hmF2 model options offered online at http://irimodel.org are computed for winter and summer solstice and equinox seasons of 2011 and 2015 at the locations of all available ionosondes and for all measurement intervals. The ionosondes are grouped into northern and southern midlatitude, northern and southern high‐latitude and equatorial regions. Individual, regional and global model output foF2 and hmF2 values are compared with those of ionosondes in both root‐mean‐square (RMS) and normalized RMS (NRMS) senses. For foF2, “STORM ON” can be used any time and in any region. Equatorial and high‐latitude regions have larger RMS values due to the sparse ionosondes. In northern midlatitude and high‐latitude regions URSI, in all other regions CCIR is the better option. For hmF2, SHU‐2015 and BSE‐1979 options provide a better fit for all regions, seasons, and years.

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“…Significant Total Electron Content (TEC) perturbations affect systems that use Earth-space environment such as satellite telephones, satellite televisions, and remote sensing of the Earth using satellites. Many researchers have studied low latitude TEC under different conditions such as disturbed (Habarulema et al, 2013b;D'ujanga et al, 2013), low solar activity (Liu et al, 2012;Galav et al, 2010), ascending phase of solar activity (Olwendo et al, 2012a,b;D'ujanga et al, 2013) and during high solar activities (Klausner et al, 2009). Despite these various investigations over the low latitude regions, not much has been reported on the degree of TEC perturbations especially over the Ugandan region.…”

Section: Introductionmentioning

confidence: 96%

Statistical analysis of TEC perturbations over a low latitude region during 2009–2013 ascending solar activity phase

Andima

Jurua

Amabayo

et al. 2015

Advances in Space Research

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Total electron content of the ionosphere at two stations in East Africa during the 24–25 October 2011 geomagnetic storm

Cited by 38 publications

References 21 publications

Space weather effects on Earth's environment associated to the 24–25 October 2011 geomagnetic storm

Space weather effects on Earth's environment associated to the 24–25 October 2011 geomagnetic storm

Comparison of IRI‐2016 F2 Layer Model Parameters with Ionosonde Measurements

Statistical analysis of TEC perturbations over a low latitude region during 2009–2013 ascending solar activity phase

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