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GPS phase fluctuations observed along the American sector during low irregularity activity months of 1997–2000

Abstract

The Global Positioning System (GPS) provides an alternative way to investigate ionospheric irregularities and their effects on the radio wave propagation. The method is based on fluctuations of the total electron content (TEC) resulted from the ionospheric plasma irregularities. Previous studies have showed the correlation between the radiowave intensity (including GPS signals) and ionospheric irregularities during magnetic storm periods. In this study, phase fluctuations derived from GPS signals are used to address aspects of the ionospheric storm events during the low irregularity activity months. We analyze data from seven GPS stations located in Central- and South-America during eight magnetic storms occurred from 1997 to 2000. It is found that, in general no significant feature in the phase fluctuation is observed during the low irregularity activity months, except during the 26 August 1998 and the 15 July 2000 storms. A detailed study shows that the GPS phase fluctuations develop when the Dst index begins to decrease significantly. This phenomenon cannot be compared directly to previous observations and model results due to the fundamental difference in the background levels of irregularity activity. To better understand the generation of ionospheric irregularities during the storm period of the low irregularity activity months, the temporal relationship between the magnetic Dst index, equatorial anomaly TEC, and the GPS phase fluctuations are examined and discussed.

References

  1. Aarons, J., The role of the ring current in the generation or inhibition of equatorial F layer irregularities during magnetic storms, Radio Sci., 26, 1131–1149, 1991.

  2. Aarons, J., The longitudinal morphology of equatorial F-layer irregularities relevant to their occurrence, Space Sci. Rev., 63, 209–243, 1993.

  3. Aarons, J., M. Mendillo, and R. Yantosca, GPS phase fluctuations in the equatorial region during the MISETA 1994 campaign, J. Geophys. Res., 101, 26,851–26,862, 1996.

  4. Aarons, J., M. Mendillo, and R. Yantosca, GPS phase fluctuations in the equatorial region during sunspot minimum, Radio Sci., 32, 1535–1550, 1997.

  5. Basu, Su., E. MacKenzie, and S. Basu, Ionospheric constraints on VHF/UHF communication links during solar maximum and minimum periods, Radio Sci., 23, 363–378, 1988.

  6. Batista, I. S., M. A. Abdu, and J. A. Bittencourt, Equatorial F region vertical plasma drifts: Seasonal and longitudinal asymmetries in the American sector, J. Geophys. Res., 91, 12,055–12,064, 1986.

  7. Batista, I. S., E. R. D. Paula, M. A. Abdu, and N. B. Trivedi, Ionospheric effects of the March 13, 1989, Magnetic storm at low and equatorial latitudes, J. Geophys. Res., 96, 13,943–13,952, 1991.

  8. Beach, T. L. and P. M. Kintner, Simultaneous global positioning system observations of equatorial scintillations and total electron content fluctuations, J. Geophys. Res., 104, 22,553–22,565, 1999.

  9. Blanc, M. and A. D. Richmond, The ionospheric disturbance dynamo, J. Geophys. Res., 85, 1669–1686, 1980.

  10. Dabas, R. S., D. R. Lakshmi, and B. M. Reddy, Effect of geomagnetic disturbances on the VHF nighttime scintillation activity at equatorial and low latitudes, Radio Sci., 24, 563–573, 1988.

  11. Fejer, B. G., E. R. D. Paula, I. S. Batista, E. Bonelli, and R. F. Woodman, Equatorial F region vertical plasma drifts during solar maxima, J. Geophys. Res., 94, 12,049–12,054, 1989.

  12. Gonzales, C. A., M. C. Kelley, R. A. Behnke, J. F. Vickrey, R. Wand, and J. Holt, On the latitudinal variations of the ionospheric electric field during magnetospheric disturbances, J. Geophys. Res., 88, 9135–9144, 1983.

  13. Ho, C. M., A. J. Mannucci, U. J. Lindqwister, X. Pi, and B. T. Tsurutani, Global ionosphere perturbations monitored by the worldwide GPS network, Geophys. Res. Lett., 23, 3219–3222, 1996.

  14. Jakowski, N., E. Putz, and P. Spalla, Ionospheric storm characteristics deduced from satellite radio beacon observations at three European stations, Ann. Geophys., 8, 343–352, 1990.

  15. Jakowski, N., S. Schluter, and E. Sardon, Total electron content of the ionosphere during the geomagnetic storm on 10 January 1997, J. Atmos. Solar-Terr. Phys., 61, 299–307, 1999.

  16. Jones, K. L. and H. Rishbeth, The origin of storm increases of mid-latitude F-layer electron concentration, J. Atmos. Terr. Phys., 33, 391–401, 1971.

  17. Kelley, M. C., The Earth’s Ionosphere, 487 pp., Academic Press, San Diego, 1989.

  18. Kelley, M. C., B. G. Fejer, and C. A. Gonzales, An explanation for anomalous ionospheric electric fields associated with a northward turning of the interplanetary magnetic field, Geophys. Res. Lett., 6, 301–304, 1979.

  19. Leick, A., GPS Satellite Surveying, 560 pp., John Wiley & Sons, New York, 1995.

  20. Liu, J. Y., H. F. Tsai, and T. K. Jung, Total electron content obtained by using the global positioning system, Terr. Atmos. Oceanic Sci., 7, 111–121, 1996.

  21. Liu, J. Y., H. F. Tsai, C. C. Wu, C. L. Tseng, L. C. Tsai, W. H. Tsai, K. Liou, and J. K. Chao, The effect of geomagnetic storm on ionospheric total electron content at equatorial anomaly region, Adv. Space Res., 24, 1491–1494, 1999.

  22. Maruyama, T., A diagnostic model for equatorial spread F: 1. Model description and application to electric field and neutral wind effects, J. Geophys. Res., 93, 14,611–14,622, 1988.

  23. Maruyama, T. and N. Matuura, Longitudinal variability of annual changes in activity of equatorial spread F and plasma bubbles, J. Geophys. Res., 89, 10,903–10,912, 1984.

  24. Mendillo, M., B. Lin, and J. Aarons, The application of GPS observations to equatorial aeronomy, Radio Sci., 35, 885–904, 2000.

  25. Mullen, J. P., Sensitivity of equatorial scintillation to magnetic activity, J. Atmos. Terr. Phys., 35, 1187–1194, 1973.

  26. Pi, X., A. J. Mannucci, U. J. Lindqwister, and C. M. Ho, Monitoring of global ionospheric irregularities using the worldwide GPS network, Geophys. Res. Lett., 24, 2283–2286, 1997.

  27. Sardón, E., A. Rius, and N. Zarraoa, Estimation of the transmitter and receiver differential biases and the ionospheric total electron content from Global Positioning System observations, Radio Sci., 29, 577–586, 1994.

  28. Sastri, J. H., K. B. Ramesh, and D. Karunakaran, On the nature of substorm-related transient electric field disturbances in the equatorial ionosphere, Planet. Space Sci., 40, 95–103, 1992.

  29. Tsai, H. F. and J. Y. Liu, Ionospheric total electron content response to solar eclipses, J. Geophys. Res., 104, 12,657–12,668, 1999.

  30. Wanninger, L., Effects of the equatorial ionosphere on GPS, GPS World (July), 48–54, 1993.

  31. Zarraoa, N. and E. Sardón, Test of GPS for permanent ionospheric TEC monitoring at high latitudes, Ann. Geophys., 14, 11–19, 1996.

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Correspondence to S. J. Shan.

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Keywords

  • Total Electron Content
  • Magnetic Storm
  • Ionospheric Irregularity
  • Equatorial Anomaly
  • Anomaly Total Electron Content