Equatorial F2-layer peak height and correlation with vertical ion drift and M(3000)F2

Obrou, O. K.; Bilitza, D.; Adeniyi, J.O.; Radicella, S. M.

doi:10.1016/s0273-1177(03)00024-3

Cited by 56 publications

(51 citation statements)

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“…This means that drastically opposite behaviors seen at Korhogo and Ouagadougou reveals some differences that are probably consistent with their magnetic northern hemisphere and southern hemisphere locations. In addition, the differences of our results from Obrou et al (2003) may partly come from the longitudinal structure of h m F 2 . The observations given above are in accord with the findings reported by Bilitza et al (2004b) using data collected at the two stations, Korhogo and Ouagadougou during low, moderate and high solar activity years of 1995 and 1985, 1998 and 1993, and 2000 and 1991, respectively; to examine variability of f o F 2 at the two stations.…”

Section: Discussioncontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 73%

“…The correlation of equatorial vertical drift with ionospheric F 2 -layer parameter has not been given serious consideration except those of Obrou et al (2003). The differences between Obrou et al (2003) correlation relationship between h m F 2 and vertical plasma drift and the current study will be shown later. Using a relatively simple and approximate theoretical model calculation of an upward drift of the equatorial ionospheric plasma, based on the analytic solutions of the continuity equation for daytime solar maximum conditions, have examined interrelationship between equatorial ionospheric F 2 -region parameters.…”

Section: Introductionmentioning

confidence: 73%

“…It is of note that the former authors, Obrou et al (2003) used ionosonde data recorded at Korhogo, • N, 5.4…”

Section: Discussionmentioning

confidence: 99%

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Equatorial vertical plasma drifts and the measured and IRI model-predicted F 2-layer parameters above Ouagadougou during solar minimum

Oyekola¹

2012

Earth Planet Sp

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In this paper, hourly median value of ionosonde measurements: peak height F 2 -layer (h m F 2 ), F 2 -layer critical frequency ( f o F 2 ) and propagation factor M(3000)F 2 made at near-equatorial dip latitude, Ouagadougou, Burkina Faso (12• N, 1.5 • W; dip: 1.5• N) and relevant F 2 -layer parameters: thickness parameter (B o ), electron temperature (T e ), ion temperature (T i ), total electron content (TEC) and electron density (N e ) (at the fixed altitude of 300 km) provided by the International Reference Ionosphere (IRI) model for the longitude of Ouagadougou are contrasted with the IRI vertical drift model to explore in detail the monthly climatological behavior of equatorial ionosphere and the effects of equatorial electrodynamics on the diurnal structure of F 2 -layer parameters. The analysis period covers four months representative of solstitial and equinoctial seasonal periods during solar minimum year of 1987 for geomagnetically quiet-day. It is demonstrated that the month-by-month morphological patterns between vertical E × B drifts and F 2 -layer parameters range from worst to reasonably good and are largely seasonally dependent. A cross-correlation analysis conducted between equatorial drift and F 2 -layer characteristics yield statistically significant correlations for equatorial vertical drift and IRI-B o , IRI-T e and IRI-TEC, whereas little or no acceptable correlation is obtained with observational evidence. Examination of the association between measured f o F 2 , h m F 2 and M(3000)F 2 illustrates consistent much more smaller correlation coefficients with no systematic linkage.

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Section: Discussioncontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 73%

“…It is of note that the former authors, Obrou et al (2003) used ionosonde data recorded at Korhogo, • N, 5.4…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Equatorial vertical plasma drifts and the measured and IRI model-predicted F 2-layer parameters above Ouagadougou during solar minimum

Oyekola¹

2012

Earth Planet Sp

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“…In the equatorial ionosphere, there were many studies applying ionosonde and digisonde data to validate the F2-layer parameters of IRI model (Adeniyi and Adimula, 1995;Adeniyi and Radicella, 1998a, b;Reinisch and Huang, 1998;Adeniyi et al, 2003;Obrou et al, 2003;Abdu et al, 2004;Batista and Abdu, 2004;Lee andReinisch, 2006, 2012;Lee et al, 2008). The F2-layer parameters are the F2-layer peak electron density (NmF2), its height (hmF2), and the bottom-side profile parameters (B0 and B1).…”

Section: Introductionmentioning

confidence: 99%

Observed and predicted characteristics of equatorial F1 layer during solar minimum

Lee

2014

Ann. Geophys.

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Abstract. This study aims to assess the predictability of IRI-2012 on the equatorial F1 layer during solar minimum. The observed characteristics of F1 layer by the Jicamarca digisonde are compared with the model outputs. The results show that the time range for F1-layer appearance of observation is longer than that of IRI-2012, by at least 1 h in the early morning and later afternoon. In IRI-2012, there are three options for the occurrence probability of F1 layer: IRI-95, Scotto-97 no L, and Scotto-97 with L options. The first option predicts the probability well, but the last two underestimate the probability. The peak density of F1 layer (NmF1) of observation is very close to that of IRI-2012. For the F1 peak height (hmF1), the modeled values are smaller than the observed ones. The observed seasonal variation of hmF1 is not found in the modeled results. Nevertheless, the observed diurnal variation of hmF1 is similar to the modeled results with the B0 choices of Bil-2000 and ABT-2009. Regarding the shape parameter, the values of D1 (the shape parameter of F1 layer in observation) are much greater than the values of C1 (the shape parameter of F1 layer in IRI-2012). The D1 values are 3-6 times the C1 values. The diurnal variation of D1 is similar to that of C1, but the seasonal variation of D1 is not.

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Modeling Chinese ionospheric layer parameters based on EOF analysis

Wan

Xiong

et al. 2015

Space Weather

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Using 24-ionosonde observations in and around China during the 20th solar cycle, an assimilative model is constructed to map the ionospheric layer parameters (f o F 2 , h m F 2 , M(3000)F 2 , and f o E) over China based on empirical orthogonal function (EOF) analysis. First, we decompose the background maps from the International Reference Ionosphere model 2007 (IRI-07) into different EOF modes. The obtained EOF modes consist of two factors: the EOF patterns and the corresponding EOF amplitudes. These two factors individually reflect the spatial distributions (e.g., the latitudinal dependence such as the equatorial ionization anomaly structure and the longitude structure with east-west difference) and temporal variations on different time scales (e.g., solar cycle, annual, semiannual, and diurnal variations) of the layer parameters. Then, the EOF patterns and long-term observations of ionosondes are assimilated to get the observed EOF amplitudes, which are further used to construct the Chinese Ionospheric Maps (CIMs) of the layer parameters. In contrast with the IRI-07 model, the mapped CIMs successfully capture the inherent temporal and spatial variations of the ionospheric layer parameters. Finally, comparison of the modeled (EOF and IRI-07 model) and observed values reveals that the EOF model reproduces the observation with smaller root-mean-square errors and higher linear correlation coefficients. In addition, IRI discrepancy at the low latitude especially for f o F 2 is effectively removed by EOF model.

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Equatorial F2-layer peak height and correlation with vertical ion drift and M(3000)F2

Cited by 56 publications

References 2 publications

Equatorial vertical plasma drifts and the measured and IRI model-predicted F 2-layer parameters above Ouagadougou during solar minimum

Equatorial vertical plasma drifts and the measured and IRI model-predicted F 2-layer parameters above Ouagadougou during solar minimum

Observed and predicted characteristics of equatorial F1 layer during solar minimum

Modeling Chinese ionospheric layer parameters based on EOF analysis

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