GPS satellite measurements: ionospheric slab thickness and total electron content

Goodwin, G.L.; Silby, J. H.; Lynn, K. J. W.; Breed, A. M.; Essex, E. A.

doi:10.1016/0021-9169(95)00093-h

Cited by 34 publications

(25 citation statements)

References 3 publications

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“…The seasonal feature of Wuhan H m is also similar to the general trend for the slab thickness to decrease from summer to equinox to winter as reported by Goodwin et al (1995), Jayachandran et al (2004) and Wu et al (1998).…”

Section: Seasonal and Solar Activity Variations Of Wuhan H Msupporting

confidence: 87%

A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2

2006

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Abstract. The diurnal, seasonal, and solar activity variations of the ionogram derived scale height around the ionospheric F-layer peak (H m) are statistically analyzed at Wuhan (114.4 • E, 30.6 • N) and the yearly variations of H m are also investigated for Wuhan and 12 other stations where H m data are available. H m, as a measure of the slope of the topside electron number density profiles, is calculated from the bottomside electron density profiles derived from vertical sounding ionograms using the UMLCAR SAO-Explorer. Results indicate that the value of median H m increases with increasing solar flux. H m is highest in summer and lowest in winter during the daytime, while it exhibits a much smaller seasonal variation at night. A common feature presented at these 13 stations is that H m undergoes a yearly annual variation with a maximum in summer during the daytime. The annual variation becomes much weaker or disappears from late night to pre-sunrise. In addition, a moderate positive correlation is found between H m with hmF2 and a strong correlation between the bottomside thickness parameter B0 and H m. The latter provides a new and convenient way for empirical modeling the topside ionospheric shape only from the established B0 parameter set.

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Section: Seasonal and Solar Activity Variations Of Wuhan H Msupporting

confidence: 87%

A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2

2006

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“…TEC is defined as the total electron content (electron/m 2 ) of a vertical column of 1-m 2 cross-section (Goodwin et al, 1995). This definition of TEC is actually the definition of the vertical TEC (VTEC) through the piercing point with the obliquity factor (Lin, 2001;Brunini et al, 2004;Cabrera et al, 2005).…”

Section: Gps Tec Datamentioning

confidence: 99%

Comparison of GPS TEC measurements with IRI TEC prediction at the equatorial latitude station, Chumphon, Thailand

et al. 2011

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We have analyzed the total electron content (TEC) derived from dual-frequency GPS receivers (GPS TEC) at the Chumpon station, Thailand, during the period [2004][2005][2006]. The diurnal, monthly, and seasonal variation in the measured TEC is compared with the TEC derived from the IRI-2007 model as well as the TEC obtained from the International GNSS service (IGS). To date, TEC data at equatorial latitudes are limited. The Chumphon station (10.72• N, 99.37• E) is located at the equatorial latitude and the dip latitude of 3• N. The TEC from the IRI-2007 model is based on the actual F 2 plasma frequency ( f o F 2 ) measurement. The results of our study show that the TEC derived from the IRI-2007 model agrees with the GPS TEC data mostly in the morning hours, but that it generally underestimates the GPS TEC. The maximum differences are about 15 TECU during the daytime and 5 TECU during the nighttime. The underestimation is more evident at daytime than at nighttime. The noon-bite out phenomena are clearly seen for the IRI-2007 TEC, but not on the IGS TEC and GPS TEC. The general underestimation of the IRI-2007 model can be explained from the exclusion of the plasmasphere, whereas the large difference during noon bite-outs is caused by the difference in the slab thickness in the ionosphere between the IRI-2007 model and the actual measurement. When compared with the TEC from the IGS model, the TEC measurements at Chumpon appear to be quite similar.

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“…N m F 2 is the peak electron density in the F 2 -region (electron/m 3 ), computed using the expression (Goodwin et al, 1995).…”

Section: Observations and Methodsmentioning

confidence: 99%

“…Measurements of the ionospheric total electron content (TEC) are useful for determining the delay of a radio signal transmitted from a global positioning system (GPS) satellite to a ground receiver (Goodwin et al, 1995). In this study, the diurnal, seasonal, and solar activity variations of the ionospheric slab thickness (τ ) are investigated by using the GPS signals in the equatorial ionization anomaly (EIA) region.…”

Section: Introductionmentioning

confidence: 99%

Variation of ionospheric slab thickness observations at Chumphon equatorial magnetic location

et al. 2011

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This study presents the diurnal and seasonal variations of slab thickness at the equatorial magnetic latitudes in Thailand during [2004][2005][2006], corresponding to the declining part of low solar activity. The GPS-derived total electron content (TEC) and the maximum electron density of the F-region (N m F 2 ) are used to compute the slab thickness (τ ) at the Chumphon station (10.72• N, 99.37• E), located near the magnetic equator. The results show that large peaks of slab thickness exist during the pre-sunrise hours in all three seasons at Chumphon when compared with other latitudes. The maximum value of slab thickness occurs when the peak electron density in the F 2 region is at the lowest level. During daytime, the slab thickness ranges from 200 kilometers to 580 kilometers for all seasons. During nighttime, the maximum value of slab thickness is 1250 kilometers in the summer of 2004. Moreover, the diurnal variation shows two minima that appear around 0900 LT and 1900 LT, during the post-sunrise and sunset hours. The seasonal variations show that the average slab thickness daily value is greater during summer and winter than those during equinox. Our study finds that the slab thickness at Chumphon located near the equatorial latitude is much larger than those found at low, mid, and high latitudes. The difference in slab thickness between the equatorial latitude and other zones is explained by the lack of plasma flow from the plasmasphere to the F 2 region at the magnetic equator.

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GPS satellite measurements: ionospheric slab thickness and total electron content

Cited by 34 publications

References 3 publications

A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2

A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2

Comparison of GPS TEC measurements with IRI TEC prediction at the equatorial latitude station, Chumphon, Thailand

Variation of ionospheric slab thickness observations at Chumphon equatorial magnetic location

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GPS satellite measurements: ionospheric slab thickness and total electron content

Cited by 34 publications

References 3 publications

A study of the ionogram derived effective scale height around the ionospheric &lt;I&gt;hm&lt;/I&gt;F2

A study of the ionogram derived effective scale height around the ionospheric &lt;I&gt;hm&lt;/I&gt;F2

Comparison of GPS TEC measurements with IRI TEC prediction at the equatorial latitude station, Chumphon, Thailand

Variation of ionospheric slab thickness observations at Chumphon equatorial magnetic location

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A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2

A study of the ionogram derived effective scale height around the ionospheric <I>hm</I>F2