Ionospheric response to a moderate geomagnetic storm on 14 April 2022 and a partial solar eclipse 30 April 2022

Idosa, Chali; Seba, Ephrem Beshir

doi:10.1007/s12648-023-02813-w

Cited by 5 publications

(5 citation statements)

References 67 publications

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“…During PSE2022, we could observe a clear VTEC decrease (−28%, −2.8 TECu) over RCSD (33.65 • S, 71.61 • W) (see Table 1 and Figure 6). Our results were consistent with the ionospheric behavior (DVTEC = −3 TECu) over Santiago (33.44 • S, 70.67 • W) reported in [51], for the same eclipse. The ionosphere behavior of the anomaly could be observed at the CHYT and LSCH because these GPS stations are located under the southern EIA crest (see Figures 1, 4 and 5 and Table 1).…”

Section: Ionospheric Tec Behaviorsupporting

confidence: 92%

“…After the P1 time of the PSE2022, we could observe positive values of DVTEC over the six GPS stations between 13% and 34% with respect to the background ionosphere. Our findings related to the improvements in the ionospheric TEC at the six stations during the day of the 2022 eclipse were in agreement with the graphs shown by Idosa and Beshir [51]. Therefore, although geomagnetic forcing impacted the ionosphere [63], causing a positive increase in TEC during levels of geomagnetic activity, we could clearly see the ionospheric depletion during both eclipses.…”

Section: Ionospheric Tec Behaviorsupporting

confidence: 91%

“…They concluded that the TEC response to the analyzed storm was greater than that of the PSE2022-induced effects on the ionosphere. Then, Idosa and Beshir [51] did not present TEC maps or the ionospheric effects of the 2022 partial eclipse on the EIA.…”

Section: Introductionmentioning

confidence: 97%

“…In a recent study, Idosa and Beshir [51] reported the TEC variations during the PSE2022 using three GPS stations localized in Santiago (33.44 59.00 • W). On the day of the eclipse, prior to the event, it was possible to observe that DVTEC at the three GPS stations reached values greater than 30%.…”

Section: Introductionmentioning

confidence: 99%

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IonosphericTotal Electron Content Changes during the 15 February 2018 and 30 April 2022 Solar Eclipses over South America and Antarctica

Valdés-Abreu,

Díaz,

Bravo

et al. 2023

Remote Sensing

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This is one of the first papers to study the ionospheric effects of two solar eclipses that occurred in South America and Antarctica under geomagnetic activity in different seasons (summer and autumn) and their impact on the equatorial ionization anomaly (EIA). The changes in total electron content (TEC) during the 15 February 2018 and 30 April 2022 partial solar eclipses will be analyzed. The study is based on more than 390 GPS stations, Swarm-A, and DMSP F18 satellite measurements, such as TEC, electron density, and electron temperature. The ionospheric behaviors over the two-fifth days on both sides of each eclipse were used as a reference for estimating TEC changes. Regional TEC maps were created for the analysis. Background TEC levels were significantly higher during the 2022 eclipse than during the 2018 eclipse because ionospheric levels depend on solar index parameters. On the days of the 2018 and 2022 eclipses, the ionospheric enhancement was noticeable due to levels of geomagnetic activity. Although geomagnetic forcing impacted the ionosphere, both eclipses had evident depletions under the penumbra, wherein differential vertical TEC (DVTEC) reached values <−40%. The duration of the ionospheric effects persisted after 24 UT. Also, while a noticeable TEC depletion (DVTEC ∼−50%) of the southern EIA crest was observed during the 2018 eclipse (hemisphere summer), an evident TEC enhancement (DVTEC > 30%) at the same crest was seen during the eclipse of 2022 (hemisphere autumn). Swarm-A and DMSP F18 satellite measurements and analysis of other solar eclipses in the sector under quiet conditions supported the ionospheric behavior.

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Section: Ionospheric Tec Behaviorsupporting

confidence: 92%

Section: Ionospheric Tec Behaviorsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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IonosphericTotal Electron Content Changes during the 15 February 2018 and 30 April 2022 Solar Eclipses over South America and Antarctica

Valdés-Abreu,

Díaz,

Bravo

et al. 2023

Remote Sensing

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“…In the past, various studies have been conducted on the impact of solar eclipses on ionospheric TEC over different locations of the Earth (e.g., Dear et al., 2020; Eisenbeis & Occhipinti, 2021; Evans, 1965; Ghimire et al., 2022; Idosa Uga & Beshir Seba, 2023; Le et al., 2020; Reddy, 2012; Ryba & Taylor, 1991; Sharma et al., 2010; Silwal et al., 2021, and references therewith). Eisenbeis and Occhipinti (2021) used data of ∼110 GNSS stations to study ionospheric irregularity during the 2 July 2019 solar eclipse.…”

Section: Introductionmentioning

confidence: 99%

Variation in Total Electron Content Over Ethiopia During the Solar Eclipse Events

Uga,

Gautam,

Edward

et al. 2024

Radio Science

Self Cite

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This work studies variations of ionospheric total electron content (TEC) during four distinct solar eclipse events over the Ethiopia region. Dual‐frequency global positioning system (GPS) data obtained from UNAVCO over Addis Ababa (9.036°N, 38.76°E) and Bahir Dar (11.6°N, 37.34°E) stations are used to examine the ionospheric variability during two annular solar eclipses on 15 January 2010 and 1 September 2016, a partial solar eclipse on 4 January 2011, and a hybrid solar eclipse (the eclipse path starts out as annular but later changes to total) on 3 November 2013. The results show a significant decrease in TEC values during the occurrence of the solar eclipses. Specifically, the TEC values are reduced to −20% and −10% during the annular eclipse on 15 January 2010, −33% and −38% during the partial solar eclipse on 4 January 2011, −26% and −24% during the annular solar eclipse on 1 September 2016, over the Addis Ababa and Bahir Dar stations, respectively. There is only minimal change in TEC of −8% and −9% at Addis Ababa and Bahir stations, respectively, during the 3 November 2013 solar eclipse even if the obstruction rate is high over the study area. Furthermore, the study shows that the spatial gradient of TEC reduction varies at different locations, which is attributed to the distinct amount of reduction in solar radiation reaching the Earth's surface, resulting in reduced photo‐ionization. Overall, this study provides insightful information about the behavior of the ionospheric TEC during solar eclipses over Ethiopia and emphasizes the use of dual‐frequency GPS data in tracking the variations of the TEC.

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Electronic circuit and image encryption for a new 3D nonuniformly conservative system

Abdul-Kareem,

Al-Azzawi

2024

Indian J Phys

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Ionospheric response to a moderate geomagnetic storm on 14 April 2022 and a partial solar eclipse 30 April 2022

Cited by 5 publications

References 67 publications

IonosphericTotal Electron Content Changes during the 15 February 2018 and 30 April 2022 Solar Eclipses over South America and Antarctica

IonosphericTotal Electron Content Changes during the 15 February 2018 and 30 April 2022 Solar Eclipses over South America and Antarctica

Variation in Total Electron Content Over Ethiopia During the Solar Eclipse Events

Electronic circuit and image encryption for a new 3D nonuniformly conservative system

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