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, Zhi; Yuan, Hong

doi:10.5194/angeo-33-1311-2015

Cited by 12 publications

(8 citation statements)

References 30 publications

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Section: Resultssupporting

confidence: 92%

“…In addition, the annual maximum appeared in October 12LT, reaching 437.6km, and the annual minimum appeared in April 5LT, reaching 105.2km. Moreover, the τ shows great variability during the night-time, especially during the pre-sunrise and post-sunset period, which is consistent with previous studies [7,22]. Figure 4 compared the distribution of mean and standard deviation of τ in the year of high solar activity and low solar activity, based on the same grid division.…”

Section: Resultssupporting

confidence: 86%

“…In the view of satellite-to-ground radio communications, τ is a useful parameter in that it includes information on both the topside and bottomside ionosphere. The τ is, thus, very helpful in understanding the nature of variations of the upper atmosphere and is, therefore, capable of addressing many useful ionospheric parameters, such as Chapman scale height H, topside 'half-peak density height' h0.5top, and temperature changes in the ionosphere/thermosphere systems [2][3][4][5][6][7]. In addition, according to the definition of τ, it connects VTEC and NmF2, belonging to different fields of remote sensing, which can be used to deduce NmF2 from the TEC, and vice versa [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

Zhang

Feng³

et al. 2021

Remote Sensing

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The ionospheric equivalent slab thickness (τ) is defined as the ratio of the total electron content (TEC) to the F2-layer peak electron density (NmF2), and it is a significant parameter representative of the ionosphere. In this paper, a comprehensive statistical analysis of the diurnal, seasonal, solar, and magnetic activity variations in the τ at Guam (144.86°E, 13.62°N, 5.54°N dip lat), which is located near the magnetic equator, is presented using the GPS-TEC and ionosonde NmF2 data during the years 2012–2017. It is found that, for geomagnetically quiet days, the τ reaches its maximum value in the noontime, and the peak value in winter and at the equinox are larger than that in summer. Moreover, there is a post-sunset peak observed in the winter and equinox, and the τ during the post-midnight period is smallest in equinox. The mainly diurnal and seasonal variation of τ can be explained within the framework of relative variation of TEC and NmF2 during different seasonal local time. The dependence of τ on the solar activity shows positive correlation during the daytime, and the opposite situation applies for the nighttime. Specifically, the disturbance index (DI), which can visually assess the relationship between instantaneous τ values and the median, is introduced in the paper to quantitatively describe the overall pattern of the geomagnetic storm effect on the τ variation. The results show that the geomagnetic storm seems to have positive effect on the τ during most of the storm-time period at Guam. An example, on the 1 June 2013, is also presented to analyze the physical mechanism. During the positive storms, the penetration electric field, along with storm time equator-ward neutral wind, tends to increase upward drift and uplift F region, causing the large increase in TEC, accompanied by a relatively small increase in NmF2. On the other hand, an enhanced equatorward wind tends to push more plasma, at low latitudes, into the topside ionosphere in the equatorial region, resulting in the TEC not undergoing severe depletion, as with NmF2, during the negative storms. The results would complement the analysis of τ behavior during quiet and disturbed conditions at equatorial latitudes in East Asia.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

Zhang

Feng³

et al. 2021

Remote Sensing

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“…The ionospheric equivalent slab thickness τ is defined as a ratio of the vertical total electron content to the F2 layer peak electron density ( [54][55][56], and others):…”

Section: Slab Thicknessmentioning

confidence: 99%

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

et al. 2020

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Recommendations of the International Reference Ionosphere (IRI) Workshop 2017 in Taoyuan City, Taiwan and International GNSS Service (IGS) Workshop 2018 in Wuhan, China included establishment of an ionosphere mapping service that would fuse measurements from two independent sensor networks: IGS permanent GNSS receivers providing the vertical total electron content (VTEC) measurements and ionosondes of the Global Ionosphere Radio Observatory (GIRO) that compute the bottomside vertical profiles of the ionospheric plasma density. Using available GAMBIT software at GIRO, we introduced new VTEC products to its data roster: previously unavailable global average (climate) maps of VTEC and slab thickness based on climatological capabilities of IRI. Incorporation of the VTEC and maps into the GAMBIT Explorer environment provided data analysts with nearly 10-year history of the reference average VTEC records and opened access to the GAMBIT toolkit for evaluation and validation of the computations. This result is the first step towards establishing an infrastructure and the data workflow to provide GAMBIT users with the low latency and consistent quality and usability of the ionospheric weather-climate specifications. Combination of IGS-provided VTEC and GIRO-provided peak density of F2 layer NmF2 allows ground-based evaluation of the equivalent slab thickness , a derived property of the near-Earth plasma that characterizes the skewness of its vertical profile up to the GNSS spacecraft altitudes.

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“…The study of ionospheric slab thickness is essential due to the fact that it provides information on the shape of the electron density profile, the neutral and ionospheric temperature gradient as well as the ionospheric composition and dynamics [11,1,3].…”

Section: Introductionmentioning

confidence: 99%

Diurnal and Seasonal Variations of Equivalent Slab thickness over Low and Mid Latitude Regions

Owolabi¹,

Ariyibi²,

Lilian³

et al. 2019

JAP

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The equivalent slab-thickness is very important in the study of the complex dynamics of the ionosphere as a result of its ability to determine the skewness of the ionospheric electron density profile. This study involves the day to day and monthly variations of . Ionosonde (FoF2) and Total electron content (TEC) data at the low latitude station of Sao Luis (Glat 2.60° S, Glong 315.80° E and Mlat 6.05° N and Mlong 28.40° E), Brazil and mid latitude station of Chilton (Glat 51.50° N, Glong 359.40° E and Mlat 53.35° N and Mlong 84.34° E), United Kingdom from January 2013 to December 2015 were used in the study of . For Sao Luis station, the diurnal pattern for the different days are characterized by day time (08:00 – 16:00 UT) high values and nighttime (20:00 – 04:00 UT) low values; however, Chilton shows signatures, such as day time low values and nighttime high values. Also, the daytime values (~600 km) of for the low latitude station (Sao Luis) is more than double the mid latitude station (Chilton) maximum value (~235 km) over the years considered. The monthly variation of also indicate a seasonal variation with highest daytime values (400 km) during winter months and lowest (below 300 km) during summer months for the low latitude station (Sao Luis). However, the nighttime values are of the same order (about 200 km) for the low latitude station (Sao Luis). Also, highest daytime values (above 250 km) are observed during summer months and the nighttime values are below 200 km over the years for the mid latitude station (Chilton).

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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

Cited by 12 publications

References 30 publications

Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

Diurnal and Seasonal Variations of Equivalent Slab thickness over Low and Mid Latitude Regions

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