Ionospheric slab thickness – Analysis, modelling and monitoring

Stankov, S. M.; Warnant, René

doi:10.1016/j.asr.2009.07.010

Cited by 48 publications

(59 citation statements)

References 36 publications

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“…Similar nature of variation was also reported earlier over Waltair, during a high solar activity period by Prasad et al (1987). The results obtained over Delhi are consistent with those obtained by Stankov and Warnant (2009) and Chuo et al (2010), in which a predawn enhancement in the slab-thickness and gradual disappearance from winter to summer at mid latitudes have been observed. The atmospheric neutral winds and enhanced eastward electric fields have significant and dominant influence on the peaks during these two periods (Chuo et al, 2010).…”

Section: Variation Of Equivalent Slab-thickness (τ )supporting

confidence: 81%

Study of TEC, slab-thickness and neutral temperature of the thermosphere in the Indian low latitude sector

et al. 2011

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Abstract. The ionospheric equivalent slab-thickness is an important parameter which measures the skewness of the electron density profile of the ionosphere. In this paper, the diurnal, seasonal, day-to-day and latitudinal variations of ionospheric parameters namely total electron content (TEC), the peak ionization density of F-layer (NmF2), equivalent slab-thickness (τ ) and neutral temperature (T n ) are presented. The simultaneous data of GPS-TEC and NmF2 from Trivandrum (8.47 • N, 76.91 • E), Waltair (17.7 • N, 83.3 • E) and Delhi (28.58 • N, 77.21 • E) are used to compute the slabthickness (τ = TEC/NmF2) of the low sunspot period, [2004][2005]. The day-time TEC values at Waltair are found to be greater than those at Trivandrum, while at Delhi the day-time TEC values are much lower compared to those at Trivandrum and Waltair. The trends of variation in the monthly mean diurnal variation of TEC and NmF2 are similar at Delhi, while they are different at Trivandrum and Waltair during the daytime. The slab-thickness (τ ) has shown a pre-sunrise peak around 05:00 LT at all the three stations, except during the summer months over Delhi. A consistent secondary peak in slab-thickness around noon hours has also been observed at Trivandrum and Waltair. During equinox and winter months a large night-time enhancement in the slab-thickness (comparable to the early morning peak in slab-thickness) is observed at Delhi. The latitudinal variation of slab-thickness has shown a decrease from the equatorial station, Trivandrum to the low-mid latitude station, Delhi. The neutral temperatures (T n ) computed from the slab-thickness (τ ) has shown a sharp increase around 05:00 LT over Trivandrum and Waltair. Whereas at Delhi, a double peaking around 05:00 and 23:00 LT is observed during winter and equinoctial months. The neutral temperatures computed are compare well with those of the MSIS-90 model derived temperatures.

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Section: Variation Of Equivalent Slab-thickness (τ )supporting

confidence: 81%

Study of TEC, slab-thickness and neutral temperature of the thermosphere in the Indian low latitude sector

et al. 2011

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“…In each season a daily variation in the northern hemisphere is rather more than in the southern hemisphere. It differs from results for summer in other papers, for example (Stankov and Warnant, 2009). Pre-dawn maximums of s are accurately visible during all seasons in subauroral areas.…”

Section: Results Of S(med) Comparison With Experimental Datacontrasting

confidence: 70%

Comparative analysis of two new empirical models IRI-Plas and NGM (the Neustrelitz Global Model)

Maltseva

Mozhaeva

Nikitenko

2015

Advances in Space Research

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“…It was revealed that the slab thickness varies with diurnal, seasonal, geomagnetic and solar activity. Stankov and Warnant (2009) described the climatological and storm-time behaviour of the slab thickness based on long-term observations at a European mid-latitude site (Dourbes), which further confirmed the expected diurnal, seasonal, and geomagnetic dependency. Guo et al (2011) reported the latitudinal variation in the slab thickness using global ionospheric maps (GIMs) and the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC).…”

Section: Introductionmentioning

confidence: 73%

“…Bhonsle et al, 1965;Titheridge, 1973;Huang, 1983). Based on most of the available and reliable observations of ionospheric TEC and NmF2, numerous analyses for recording the climatology of the slab thickness have been conducted over the past few decades (Jayachandran et al, 2004;Chuo, 2007;Jin et al, 2007;Stankov and Warnant, 2009;Guo et al, 2011;Kenpankho et al, 2011;Weng et al, 2012). Jayachandran et al (2004) investigated the variation in the slab thickness during the solar maximum and minimum phases of an intense solar cycle by using the hourly values of TEC and NmF2 at Hawaii (low latitude), Boulder (mid-latitude) and Goosebay (high latitude).…”

Section: Introductionmentioning

confidence: 99%

Climatology of the ionospheric slab thickness along the longitude of 120° E in China and its adjacent region during the solar minimum years of 2007–2009

Huang

Yuan

2015

Ann. Geophys.

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Abstract. The ionospheric slab thickness is defined as the ratio of the total electron content (TEC) to the ionospheric F2 layer peak electron density (NmF2). In this study, the slab thickness is determined by measuring the ionospheric TEC from dual-frequency Global Positioning System (GPS) data and the NmF2 from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC). A statistical analysis of the diurnal, seasonal and spatial variation in the ionospheric slab thickness is presented along the longitude of 120 • E in China and its adjacent region during the recent solar minimum phase (2007)(2008)(2009). The diurnal ratio, defined as the maximum slab thickness to the minimum slab thickness, and the night-to-day ratio, defined as the slab thickness during daytime to the slab thickness during night-time, are both analysed. The results show that the TEC of the northern crest is greater in winter than in summer, whereas NmF2 is greater in summer than in winter. A pronounced peak of slab thickness occurs during the postmidnight (00:00-04:00 LT) period, when the peak electron density is at the lowest level. A large diurnal ratio exists at the equatorial ionization anomaly, and a large night-to-day ratio occurs near the equatorial latitudes and mid-to high latitudes. It is found that the behaviours of the slab thickness and the F2 peak altitude are well correlated at the latitudes of 30-50 • N and during the period of 10:00-16:00 LT. This current study is useful for improvement of the regional model and accurate calculation of the signal delay of radio waves propagating through the ionosphere.

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Ionospheric slab thickness – Analysis, modelling and monitoring

Cited by 48 publications

References 36 publications

Study of TEC, slab-thickness and neutral temperature of the thermosphere in the Indian low latitude sector

Study of TEC, slab-thickness and neutral temperature of the thermosphere in the Indian low latitude sector

Comparative analysis of two new empirical models IRI-Plas and NGM (the Neustrelitz Global Model)

Climatology of the ionospheric slab thickness along the longitude of 120° E in China and its adjacent region during the solar minimum years of 2007–2009

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