The global morphology of the plasmaspheric electron content during Northern winter 2009 based on GPS/COSMIC observation and GSM TIP model results

Клименко, М. В.; Клименко, В. В.; Zakharenkova, Irina; Cherniak, Iurii

doi:10.1016/j.asr.2014.06.027

Cited by 56 publications

(52 citation statements)

References 37 publications

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“…In addition, the poor performance of the IRI‐Plas model within the equatorial region may also be attributed to the inaccurate prediction of the plasmaspheric contribution to TEC in the region. The plasmaspheric contributions to the GPS‐TEC have been reported to vary spatially and temporally [ Satya Srinivas et al ., ; Balan et al ., ; Klimenko et al ., ]. For example, plasmaspheric contribution to TEC has been reported by Satya Srinivas et al .…”

Section: Discussionmentioning

confidence: 97%

“…[] to reach up to 30% at the equatorial latitudes during the daytime, while Klimenko et al . [] reported a nighttime maximum contribution of 85% and a daytime contribution of 40% at the equator during the winter in the year 2009 (a period of extreme solar minimum condition). Balan et al .…”

Section: Discussionmentioning

confidence: 99%

“…[] reported a contribution of about 12% during the daytime and 60% during the nighttime over Japan. The plasmaspheric contribution to TEC has also been found to decrease with increase in latitude and altitude [e.g., Lunt et al ., ; Klimenko et al ., ]. For example, Yizengaw et al .…”

Section: Discussionmentioning

confidence: 99%

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Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

et al. 2016

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A reliable ionospheric specification by empirical models is important to mitigate the effects of the ionosphere on the operations of satellite‐based positioning and navigation systems. This study evaluates the capability of the International Reference Ionosphere (IRI) and IRI extended to the plasmasphere (IRI‐Plas) models in predicting the total electron content (TEC) over stations located in the southern hemisphere of the African equatorial and low‐latitude region. TEC derived from Global Positioning System (GPS) measurements were compared with TEC predicted by both the IRI‐Plas 2015 model and the three topside options of the IRI 2012 model (i.e., NeQuick (NeQ), IRI 2001 corrected factor (IRI‐01 Corr), and the IRI 2001(IRI‐01)). Generally, the diurnal and the seasonal structures of modeled TEC follow quite well with the observed TEC in all the stations, although with some upward and downward offsets observed during the daytime and nighttime. The prediction errors of both models exhibit latitudinal variation and these showed seasonal trends. The values generally decrease with increase in latitude. The TEC data‐model divergence of both models is most significant at stations in the equatorial region during the daytime and nighttime. Conversely, both models demonstrate most pronounced convergence during the nighttime at stations outside the equatorial region. The IRI‐Plas model, in general, performed better in months and seasons when the three options of the IRI model underestimate TEC. Factors such as the height limitation of the IRI model, the inaccurate predictions of the bottomside and topside electron density profiles were used to explain the data‐model discrepancies.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

et al. 2016

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“…This assumption is based on the arguments that TEC and foF2 are highly correlated (Liu et al, 1996) and the electron density at plasmasphere is several orders of magnitude lower than the F-region electron density (Gallagher et al, 2000). However, recent studies demonstrate that (1) N m F 2 and TEC behavior can be significantly different during a geomagnetic storm especially at a recovery phase (Cherniak et al, 2014), (2) the contribution of the topside ionosphere and plasmasphere to TEC results in a shift to earlier hours and weakening of the Midlatitude Summer Evening Anomaly in TEC as compared to one in N m F 2 (Klimenko et al, 2015b), and (3) sometimes the regions above the F2 layer peak height provide the largest contribution to TEC (Afraimovich et al, 2011;Klimenko et al, 2015c). This effect is even more pronounced during nighttime at the solar activity minimum, where the plasmaspheric contribution to TEC can exceed the ionospheric one (Lunt et al, 1999a, b;Cherniak et al, 2012;Klimenko et al, 2015c).…”

Section: Introductionmentioning

confidence: 97%

“…However, recent studies demonstrate that (1) N m F 2 and TEC behavior can be significantly different during a geomagnetic storm especially at a recovery phase (Cherniak et al, 2014), (2) the contribution of the topside ionosphere and plasmasphere to TEC results in a shift to earlier hours and weakening of the Midlatitude Summer Evening Anomaly in TEC as compared to one in N m F 2 (Klimenko et al, 2015b), and (3) sometimes the regions above the F2 layer peak height provide the largest contribution to TEC (Afraimovich et al, 2011;Klimenko et al, 2015c). This effect is even more pronounced during nighttime at the solar activity minimum, where the plasmaspheric contribution to TEC can exceed the ionospheric one (Lunt et al, 1999a, b;Cherniak et al, 2012;Klimenko et al, 2015c). In fact, the TEC variability depends on the lower and topside ionosphere as well as the plasmasphere (Balan et al, 2002;Gulyaeva and Gallagher, 2007;Yizengaw et al, 2008;Cherniak et al, 2012;Lee et al, 2013;Zakharenkova et al, 2013;Klimenko et al, 2015b, c;Lei et al, 2015).…”

Section: Introductionmentioning

confidence: 97%

Similarity and differences in morphology and mechanisms of the <i>fo</i>F2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011

Клименко

Zakharenkova

et al. 2017

Ann. Geophys.

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Abstract. This study presents an analysis of the groundbased observations and model simulations of ionospheric electron density disturbances at three longitudinal sectors (eastern European, Siberian and American) during geomagnetic storms that occurred on 26-30 September 2011. We use the Global Self-consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP) to reveal the main mechanisms influencing the storm-time behavior of the total electron content (TEC) and the ionospheric F2 peak critical frequency (foF2) during different phases of geomagnetic storms. During the storm's main phase the long-lasting positive disturbances in TEC and foF2 at sunlit mid-latitudes are mainly explained by the storm-time equatorward neutral wind. The effects of eastward electric field can only explain the positive ionospheric storm in the first few hours of the initial storm phase. During the main phase the ionosphere was more changeable than the plasmasphere. The positive disturbances in the electron content at the plasmaspheric heights (800-20 000 km) at high latitudes can appear simultaneously with the negative disturbances in TEC and foF2. The daytime positive disturbances in foF2 and TEC occurred at middle and low latitudes and at the Equator due to n(O) / n(N 2 ) enhancement during later stage of the main phase and during the recovery phase of the geomagnetic storm. The plasma tube diffusional depletion and negative disturbances in electron and neutral temperature were the main formation mechanisms of the simultaneous formation of the positive disturbances in foF2 and negative disturbances in TEC at low latitudes during the storm's recovery phase.

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Ionospheric and plasmaspheric electron contents inferred from radio occultations and global ionospheric maps

et al. 2015

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We introduce a methodology to extract the separate contributions of the ionosphere and the plasmasphere to the vertical total electron content, without relying on a fixed altitude to perform that separation. The method combines two previously developed and tested techniques, namely, the retrieval of electron density profiles from radio occultations using an improved Abel inversion technique and a two-component model for the topside ionosphere plus protonosphere. Taking measurements of the total electron content from global ionospheric maps and radio occultations from the Constellation Observing System for Meteorology, Ionosphere, and Climate/FORMOSAT-3 constellation, the ionospheric and plasmaspheric electron contents are calculated for a sample of observations covering 2007, a period of low solar and geomagnetic activity. The results obtained are shown to be consistent with previous studies for the last solar minimum period and with model calculations, confirming the reversal of the winter anomaly, the hemispheric asymmetry of the semiannual anomaly, and the existence in the plasmasphere of an annual anomaly in the South American sector of longitudes. The analysis of the respective fractional contributions from the ionosphere and the plasmasphere to the total electron content shows quantitatively that during the night the plasmasphere makes the largest contribution, peaking just before sunrise and during winter. On the other hand, the fractional contribution from the ionosphere reaches a maximum value around noon, which is nearly independent of season and geomagnetic latitude.

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The global morphology of the plasmaspheric electron content during Northern winter 2009 based on GPS/COSMIC observation and GSM TIP model results

Cited by 56 publications

References 37 publications

Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

Similarity and differences in morphology and mechanisms of the <i>fo</i>F2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011

Ionospheric and plasmaspheric electron contents inferred from radio occultations and global ionospheric maps

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The global morphology of the plasmaspheric electron content during Northern winter 2009 based on GPS/COSMIC observation and GSM TIP model results

Cited by 56 publications

References 37 publications

Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

Assessment of IRI and IRI‐Plas models over the African equatorial and low‐latitude region

Similarity and differences in morphology and mechanisms of the &lt;i&gt;fo&lt;/i&gt;F2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011

Ionospheric and plasmaspheric electron contents inferred from radio occultations and global ionospheric maps

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Similarity and differences in morphology and mechanisms of the <i>fo</i>F2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011