Comparison of ionospheric equivalent slab thickness with bottomside digisonde profile over Wuhan

Chuo, Y. J.; Lee, Chien Chih; Chen, Wei Sheng

doi:10.1016/j.jastp.2010.02.003

Cited by 18 publications

(11 citation statements)

References 27 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: 90%

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: 90%

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 every season, the diurnal variation in northern hemisphere is comparatively greater than that in southern hemisphere. Some studies have reported that, in summer, the value of the slab thickness in daytime is greater than that in nighttime (Stankov and Warnant., 2009;Chuo et al, 2010). But in our results this phenomenon is not clear (Fig.…”

Section: Results and Analysiscontrasting

confidence: 75%

“…At mid-latitudes the post-sunset peaks appear in the winter and equinox and disappear in the summer. The diurnal and seasonal variations of the slab thickness have been reported and analyzed in detail (Stankov and Warnant, 2009;Chuo et al, 2010). Several studies indicate that in the northern hemisphere the slab thickness in daytime is generally greater than that in nighttime in summer.…”

Section: Results and Analysismentioning

confidence: 99%

“…It was recognized that the slab thickness shows diurnal, day-to-day, seasonal, spatial, solar, and geomagnetic activity variations. In several papers, the slab thickness and its variation have been reported to have a considerable dependence on the location of stations, for instance, the TEC from the GOES satellite (Mansilla, et al, 2005;Jayachandran et al, 2004) or GPS satellite (Chuo et al, 2010;Stankov and Warnant, 2009) and NmF2 from the ground-based ionosonde. The understanding of the behavior of the slab thickness still has some uncertainties due to insufficient observation data.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the ionospheric equivalent slab thickness based on ground-based GPS/TEC and GPS/COSMIC RO measurements

Guo

Zhang

2011

Journal of Atmospheric and Solar-Terrestrial Physics

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“…EST provides an alternative way to interpret H. Once we have EST, we could estimate H and further the electron density profile. Thus, the spatial, temporal, and solar activity features of EST have been studied worldwide [Breed et al, 1997;Chuo et al, 2010;Dabas et al, 1993;Davies and Liu, 1991;Duarte-Silva et al, 2015;Goodwin et al, 1995aGoodwin et al, , 1995bGulyaeva, 2007;Gulyaeva et al, 2004;Jin et al, 2007;Kenpankho et al, 2011;Kouris et al, 2008;Stankov and Warnant, 2009]. Moreover, geomagnetic storms are also found to influence EST [e.g., Àlàgbé, 2012;Chuo et al, 2010;Gulyaeva, 2007].…”

Section: Introductionmentioning

confidence: 99%

A global picture of ionospheric slab thickness derived from GIM TEC and COSMIC radio occultation observations

et al. 2016

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The ionospheric equivalent slab thickness (EST), defined as the ratio of total electron content (TEC) to F2 layer peak electron density (NmF2), describes the thickness of the ionospheric profile. In this study, we retrieve EST from TEC data obtained from Global Ionospheric Map (GIM) and NmF2 retrieved from Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) ionospheric radio occultation data. The diurnal, seasonal, and solar activity variations of global EST are analyzed as the excellent spatial coverage of GIM and COSMIC data. During solstices, daytime EST in the summer hemisphere is larger than that in the winter hemisphere, except in some high‐latitude regions, and the reverse is true for the nighttime EST. The peaks of EST often appear at 0400 local time. The presunrise enhancement in EST appears in all seasons, while the postsunset enhancement in EST is not readily observed in equinox. Both enhancements are attributed to the more remarkable electron density decay of NmF2 compared to that of TEC. The dependence of EST on solar activity is related to the inconsistent solar activity dependences of electron density at different altitudes. Furthermore, it is interesting that EST is enhanced from 0° to 120°E in longitude and 30° to 75°S in latitude during nighttime, just to the east of Weddell Sea Anomaly, during equinox and the Southern Hemisphere summer. This phenomenon is supposed to be related to the effects of geomagnetic declination‐related plasma vertical drifts.

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Comparison of ionospheric equivalent slab thickness with bottomside digisonde profile over Wuhan

Cited by 18 publications

References 27 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

Analysis of the ionospheric equivalent slab thickness based on ground-based GPS/TEC and GPS/COSMIC RO measurements

A global picture of ionospheric slab thickness derived from GIM TEC and COSMIC radio occultation observations

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