Performance of the IRI-2016 at the Brazilian low-latitude ionosphere over the South America Magnetic Anomaly during solar minimum

Moro, Juliano; Xu, Jiyao; Nardin, C. M. De; Resende, L. C. A.; Silva, R. P.; Chen, Sony Su; Picanço, Giórgio Arlan da Silva; Liu, Zhengkuan; Li, Hui; Yan, Chunxiao; Wang, Chi; Schuch, Nelson Jorge

doi:10.5194/angeo-2019-126

Cited by 2 publications

(3 citation statements)

References 25 publications

(29 reference statements)

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“…Uncertainties in h m F 2 estimates can reach several tens of kilometers making it is impossible to decide which model is better. Similar researches made by Zhao et al (2017) and Moro et al (2019) show that SHU-2015 option when using IRI-2016 to model h m F 2 over the Chinese and Brazilian regions is preferred. On the other hand, this conclusion is in sharp contrast with the results of an investigation carried out by Oyekola (2019).…”

Section: Resultssupporting

confidence: 66%

Ionosphere over Ukrainian Antarctic Akademik Vernadsky station under minima of solar and magnetic activities, and daily insolation: case study for June 2019

Bogomaz¹,

Shulha²,

Kotov³

et al. 2020

UAJ

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We present ionospheric observational results obtained over Ukrainian Antarctic Akademik Vernadsky station. Ionospheric parameters (peak electron density and height, electron density and electron and ion temperatures in the topside) during the period near the local winter solstice in the Southern Hemisphere (June 28-29, 2019) are considered. The main objective is to show distinctive features of variations in ionospheric parameters during a prolonged period with very low solar and magnetic activities, and minimal daily insolation. Methods. F2 layer peak electron density and height were calculated from ionograms obtained with ionosonde installed at the station with subsequent profile inversion. Defense Meteorological Satellite Program (DMSP) and Swarm data acquired over the station are used as well. Diurnal variations of electron density, and electron and ion temperatures at the altitude of the satellites' orbits were calculated using a set of sub-models of the International Reference Ionosphere-2016 (IRI-2016) model. Results. We found a very good agreement between the observed and model variations of F2 layer peak electron density. Significant (by ~2 times) nighttime enhancement of electron density was observed on June 29. Electron density models show the similar increase of the density at the same time interval but this enhancement is much more smoothed comparing with the observations. Peak height values obtained using ionosonde are very close to ones calculated with the IRI-2016 sub-models. Satellite data are in a good consistency with the IRI model predictions, especially for electron density obtained by Swarm satellite. Conclusions. Multi-instrumental observations revealed a number of unique features of the ionosphere over Antarctic Peninsula under minima of solar and magnetic activities, and daily insolation.

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Section: Resultssupporting

confidence: 66%

Ionosphere over Ukrainian Antarctic Akademik Vernadsky station under minima of solar and magnetic activities, and daily insolation: case study for June 2019

Bogomaz¹,

Shulha²,

Kotov³

et al. 2020

UAJ

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“…Zhao et al (2017) suggested SHU2015 over China, followed by BSE1979, regardless of the season and solar activity condition; after observing the worst performance by AMTB2013. The performance of the IRI-model over a low-latitude South American Ionospheric station was presented by Moro et al (2019). The authors suggested the use of the SHU2015 option during solar minimum.…”

Section: Current Studymentioning

confidence: 99%

“…The performance of the IRI‐model over a low‐latitude South American Ionospheric station was presented by Moro et al. (2019). The authors suggested the use of the SHU2015 option during solar minimum.…”

Section: Introductionmentioning

confidence: 99%

Modelling M(3000)F2 at an African Equatorial Location for Better IRI‐Model Prediction

2022

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The F2‐layer propagation factor M(3000)F2 is important to ionospheric studies owning to its use in high High frequency radio communication/ionospheric modeling. This study focused on reducing the shortcomings in the use of M(3000)F2 IRI‐model for obtaining hmF2, especially in the African equatorial region, by obtaining an empirical “constructed model” (M(3000)F2CM) using the Korhogo (geomag. lat. 1.26°S, long. 67.38°E, dip. −0.67°S) data (M(3000)F2KOR). The data spans 8 years (1993–2000) under magnetically quiet conditions (Ap < 20 nT). The Regression method technique was used in obtaining the M(3000)F2CM. The regression coefficient (R2) for the M(3000)F2KOR versus F10.7 relationship was stronger during the solstices. The associated diurnal equations obtained for all seasons from the regression plot of the M(3000)F2KOR‐F10.7 relationship were used to obtained the constructed model equation given by M(3000)F2CM(m)i = ai(m) ∗ (F10.7) + bi(m), which allows the prediction of diurnal, seasonal and solar cycle variation of the M(3000)F2 parameter. M(3000)F2CM predicted well when tested at different solar activities. Generally, M(3000)F2CM performed reasonably well in comparison with the IRI model (M(3000)F2IRI) when validated with Ouagadougou (lat. 0.59°S, long. 71.46°E) observed data ‐ M(3000)F2OUA. The percentage deviation of M(3000)F2CM versus M(3000)F2OUA during high solar activity and low solar activity ranges from −10.8–5.3/−7.6–15.8 for solstices/equinoxes; whereas percentage deviation of M(3000)F2IRI versus M(3000)F2OUA spans −15.5–9.2 and −9.7–17.7 in similar order of seasons. The characteristic diurnal post‐sunset drop in M(3000)F2, a prominent feature of the equatorial ionosphere is well captured by the empirical model. These results suggest that the new model has a measure of potential for its use in the equatorial African region.

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Performance of the IRI-2016 at the Brazilian low-latitude ionosphere over the South America Magnetic Anomaly during solar minimum

Cited by 2 publications

References 25 publications

Ionosphere over Ukrainian Antarctic Akademik Vernadsky station under minima of solar and magnetic activities, and daily insolation: case study for June 2019

Ionosphere over Ukrainian Antarctic Akademik Vernadsky station under minima of solar and magnetic activities, and daily insolation: case study for June 2019

Modelling M(3000)F2 at an African Equatorial Location for Better IRI‐Model Prediction

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