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GPS based TEC measurements for a period August 2008– December 2009 near the northern crest of Indian equatorial ionospheric anomaly region

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In recent years, measurements of total electron content (TEC) have gained importance with increasing demand for the GPS-based navigation applications in trans-ionospheric communications. To study the variation in ionospheric TEC, we used the data obtained from GPS Ionospheric Scintillation and TEC monitoring (GISTM) system which is in operation at SVNIT, Surat, India (21.16°N, 72.78°E) located at the northern crest of equatorial anomaly region. The data collected (for the low sunspot activity period from August 2008–December 2009) were used to study the diurnal, monthly, seasonal semi-annual and annual variations of TEC at Surat. It was observed that the diurnal variation at the region reaches its maximum value between 13:00 and 16:00 IST. The monthly average diurnal variations showed that the TEC maximizes during the equinox months followed by the winter months, and are lowest during the summer months. The ionospheric range delay to TEC for the primary GPS signal is 0.162 m per TECU. The diurnal variation in TEC shows a minimum to maximum variation of about 5 to 50 TECU (in current low sunspot activity periods). These TEC values correspond to range delay variations of about 1 to 9 m at Surat. These variations in the range delay will certainly increase in high sunspot activity periods. Detected TEC variations are also closely related to space weather characterizing quantities such as solar wind and geomagnetic activity indices.

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References

  • Aarons J 1982 Global morphology of ionospheric scintillations; Proceedings of IEEE 70 360–378.

    Article  Google Scholar 

  • Bailey G J, Su Y Z and Oyama K-I 2000 Yearly variations in the low latitude topside ionosphere; Ann. Geophys. 18 789–798.

    Article  Google Scholar 

  • Balan N, Otsuka Y and Fukao S 1997 New aspects in the annual variation of the ionosphere observed by the MU radar; Geophys. Res. Lett. 24 2287–2290.

    Article  Google Scholar 

  • Balan N, Otsuka Y, Fukao S, Abdu M A and Bailey G J 2000 Annual variations of the ionosphere: A review based on MU radar observations; Adv. Space Res. 25(1) 153–162.

    Article  Google Scholar 

  • Basu S and Basu Su 1981 Equatorial scintillations – a review; J. Atmos. Terr. Phys. 43 473–479.

    Article  Google Scholar 

  • Burch J L 2001 The fury of space; Scientific American, April 2001, pp. 72–80.

  • Coco D S, Cockers Dahlke S R and Clynch J R 1991 Variability of GPS satellite instrumental group delay biases; IEEE Trans. Aerosp. Electron. Syst. 27(6) 931–938.

    Article  Google Scholar 

  • Dabas R, Sharma N, Pillaia M G K and Gwal A 2006 Day-to-day variability of equatorial and low latitude F region ionosphere in the Indian zone; J. Atmos. Sol.-Terr. Phys. 68 1269–1277.

    Article  Google Scholar 

  • Dasgupta A and Basu A 1973 Investigation of ionospheric electron content in the equatorial region as obtained by orbiting beacon satellites; Ann. Geophys. 29 409–419.

    Google Scholar 

  • Davies K 1980 Recent progress in satellite radio beacon studies with particular emphasis on the ATS-6 Radio beacon experiment; Space Sci. Rev. 25 357–430.

    Article  Google Scholar 

  • Davies K, Donnelly R F, Grubb R N and Rama Rao P V S 1979 ATS-6 satellite radio beacon measurements at Ootacamund, India; Radio Sci. 14 85–95.

    Article  Google Scholar 

  • Field P R, Rishbeth H, Moffett R J, Idenden D W, Millward G H and Aylward A D 1998 Modelling composition changes in F-layer storms; J. Atmos. Sol.–Terr. Phys. 60 523–543.

    Article  Google Scholar 

  • Forbes J M, Palo S E and Zhang X 2000 Variability of the ionosphere; J. Atmos. Sol.-Terr. Phys. 62 685–693.

    Article  Google Scholar 

  • Fuller-Rowell T J, Codrescu M and Wilkinson P 2000 Quantitative modelling of the ionospheric response to geomagnetic activity; Ann. Geophys. 18 766–781.

    Article  Google Scholar 

  • Iyer K N, Deshpande M R and Rastogi R G 1976 The equatorial anomaly in ionospheric total electron content and the equatorial electrojet current strength; Proc. Indian Acad. Sci. 84 129–138.

    Google Scholar 

  • Jakowski N, Heise S and Wehrenpfennig A 2001 TEC monitoring by GPS – A possible contribution to space weather monitoring; Phys. Chern. Earth (C) 26 609–613.

    Google Scholar 

  • Kane R P 1980 Irregular variations in the global distribution of total electron content; Radio Sci. 15 837–842.

    Article  Google Scholar 

  • Langley R 1996 Propagation of the GPS signals; In: GPS for geodesy (eds) Kleusberg A and Teunissen P (Berlin Heidelberg New York: Springer), pp. 103–140.

    Chapter  Google Scholar 

  • Langley R, Fedrizzi M, Paula E, Santos M and Komjathy A 2002 Mapping the low latitude ionosphere with GPS; GPS World 13(2) 41–46.

    Google Scholar 

  • Laštovička J 2006 Forcing of the ionosphere by waves from below; J. Atmos. Sol.-Terr. Phys. 68 479–497.

    Article  Google Scholar 

  • Leick A 1995 GPS Satellite Surveying (New York: John Wiley), 560p.

    Google Scholar 

  • Liu J Y, Tsa H F and Jung T K 1996 Total electron content obtained by using the global positioning system; Terr. Atmos. Ocean Sci. (China) 7 107–117.

    Google Scholar 

  • Mannucci A J, Wilson B D and Edwards C D 1993 A new method for monitoring the earth’s ionospheric total electron content using the GPS global network; Proc. ION GPS-93, Institule of Navigation, pp. 1323–1332.

  • Millward G H, Moffett R J, Quegan S and Fuller-Rowell T J 1996 Ionospheric F2 layer seasonal and semiannual variations; J. Geophys. Res. 101 5149–5156.

    Article  Google Scholar 

  • Rama Rao P V S, Srirama Rao M and Satyam M 1977 Diurnal and seasonal trends in TEC values observed at Waltair; Indian J. Radio & Space Physics 6 233–235.

    Google Scholar 

  • Rama Rao P V S, Gopikrishnan S, Niranjan K, Prasad D S V V D and Uma G 2006 On the validity of the ionospheric pierce point (IPP) altitude of 350 km in the Indian equatorial and low latitude sector; Ann. Geophys. 24 2159–2168.

    Article  Google Scholar 

  • Rastogi R G and Sharma R P 1971 Ionospheric electron content at Ahmedabad (near the crest of equatorial anomaly) by using beacon satellite transmissions during half a solar cycle; Planet. Space Sci. 19 1505–1517.

    Article  Google Scholar 

  • Rastogi R G, Iyer K N and Bhattacharyya J C 1975 Total electron content of the ionosphere over the magnetic equator; Curr. Sci. 44 531–533.

    Google Scholar 

  • Rishbeth H and Mendillo M 2001 Patterns of F2-layer variability; J. Atmos. Sol.-Terr. Phys. 63 1661–1680.

    Article  Google Scholar 

  • Rishbeth H and Setty C S G K 1961 The F-layer at sunrise; J. Atmos. Terr. Phys. 21 263–276.

    Article  Google Scholar 

  • Sardon E, Rius A and Zarraoa N 1994 Estimation of the transmitter and the receiver differential biases and the ionospheric total electron content from Global Positioning System observations; Radio Sci. 29(3) 577–586.

    Article  Google Scholar 

  • Su Y Z, Bailey G J and Oyama K-I 1998 Annual and seasonal variations in the low-latitude topside ionosphere; Ann. Geophys. 16 974–985.

    Article  Google Scholar 

  • Titheridge J E 1974 Changes in atmospheric composition inferred from ionospheric production rates; J. Atmos. Terr. Phys. 36 1249–1254.

    Article  Google Scholar 

  • Van Dierendonck A J, Fenton P and Klobuchar J 1996 Commercial ionospheric scintillation monitoring receiver development and test results; Proc. Institute of Navigation’s 52nd Annual Technical Meeting, Cambridge, MA, pp. 573–582.

  • Watanabe S, Oyama K-I and Abdu M A 1995 Computer simulation of electron and ion densities and temperatures in the equatorial F region and comparison with Hinotori results; J. Geophys. Res. 100(A8) 14,581–14,590.

    Article  Google Scholar 

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  1. SV National Institute of Technology, Ichhanath, Surat, Gujarat 395 007, India

    S P KARIA & K N PATHAK

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  1. S P KARIA
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  2. K N PATHAK
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Correspondence to S P KARIA.

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KARIA, S.P., PATHAK, K.N. GPS based TEC measurements for a period August 2008– December 2009 near the northern crest of Indian equatorial ionospheric anomaly region. J Earth Syst Sci 120, 851–858 (2011). https://doi.org/10.1007/s12040-011-0114-1

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