Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
권호 표지
DOI QR코드

DOI QR Code

Seasonal Characteristics of the Longitudinal Wavenumber-4 Structure in the Equatorial Ionospheric Anomaly

  • Kim, E. (Department of Astronomy and Space Science, Chungnam National University) ;
  • Jee, G. (Korea Polar Research Institute, KORDI) ;
  • Kim, Y.H. (Department of Astronomy and Space Science, Chungnam National University)
  • Published : 2008.12.15
Download PDF
⟨ Previous Next ⟩

Abstract

Using the global total electron contents (TEC) measured by the TOPEX satellite from Aug. 1992 to Oct. 2005, we investigate the variations of the longitudinal wavenumber-4 (LW-4) structure in the equatorial anomaly (EA) crests with season, local time, and solar activity. Our study shows that the LW-4 structure in the EA crests ($5{\sim}20^{\circ}$ MLAT in both hemispheres) has clear four peaks at fixed longitude sectors during the daytime for both equinoxes and June solstice. In spite of being called a wavelike structure, however, the magnitudes and spatial intervals of the four peaks are far from being the same or regular. After sunset, the four-peak structure begins to move eastward with gradual weakening in its amplitude during equinoxes and this weakening proceeds much faster during June solstice. Interestingly, the longitudinal variations during December solstice do not show clear four-peak structure. All these features of the LW-4 structure are almost the same for both low and high solar activity conditions although the ion densities are greatly enhanced from low to high solar activities. With the irrelevancy of the magnetic activity in the LW-4, this implies that the large changes of the upper atmospheric ion densities, one of the important factors for ion-neutral interactions, have little effect on the formation of the LW-4 structure. On the other hand, we found that the monthly variation of the LW-4 is remarkably similar to that of the zonal component of wavenumber-3 diurnal tides at low latitudes, which implies that the lower atmospheric tidal forcing, transferred to the upper atmosphere, seems to have a dominant role in producing the LW-4 structure in the EA crests via the E-region dynamo.

Keywords

References

  1. Codrescu, M. V., Beierle, L. K., Fuller-Rowell, T. J., Palo, S. E., & Zhang, X. 2001, Radio Sciences, 36, 325 https://doi.org/10.1029/1999RS002407
  2. Codrescu, M. V., Palo, S. E., Zhang, X., Fuller-Rowell, T. J., & Poppe, C. 1999, J. of Atmospheric and Solar-Terrestrial Physics, 61, 281 https://doi.org/10.1016/S1364-6826(98)00132-1
  3. England, S. L., Immel, T. J., Sagawa, E., Henderson, S. B., Hagan,M. E., Mende, S. B., Frey, H. U., Swenson, C. M., & Paxton, L. J. 2006a, JGR, 111, doi:10.1029/2006JA011795
  4. England, S. L.,Maus, S., Immel, T. J., & Mende, S. B. 2006b, GRL, 33, doi:10.1029/2006GL027465
  5. Fejer, B. G., de Paula, E. R., Gonzalez, S. A., & Woodman, R. F. 1991, JGR, 96, 13901 https://doi.org/10.1029/91JA01171
  6. Forbes, J. M., Revelle, D., Zhang, X., & Markin, R. E. 1996, JGR, 103, 7293 https://doi.org/10.1029/98JB00025
  7. Forbes, J. M., Russell, J., Miyahara, S., Zhang, X., Palo, S., Mlynczak,M., Mertens, C. J., & Hagan, M. E. 2006, JGR, 111, doi:10J029/2005JA011492
  8. Fu, L. L., Christensen, E. J., & Yamarone Jr., C. A. 1994, JGR, 99, 24369 https://doi.org/10.1029/94JC01761
  9. Hartman,W. A. & Heelis, R. A. 2007, JGR, 112, doi:10J029/2006JA011773
  10. Ho, C. M., Wilson, B. D., Mannucci, A. J., Lindqwister, U. J., & Yuan, D. N. 1997, Radio Sciences, 32, 1499 https://doi.org/10.1029/97RS00580
  11. Horvath, I. 2006, JGR, 111, doi:10J029/2006JA011679
  12. Immel, T. J., Sagawa, E., England, S. L., Henderson, S. B., Hagan,M. E., Mende, S. B., Fery, H. U., Swenson, C. M., & Paxton, L. J. 2006, GRL, 33, doi:10J029/2006GL026161
  13. Jee, G., Schunk, R. W., & Scherliess, L. 2004, JGR, 109, doi:10J029/2003JA010058
  14. Jee, G., Schunk, R. W., & Scherliess, L. 2005, J. of Atmospheric and SolarJerrestrial Physics, 67, 365 https://doi.org/10.1016/j.jastp.2004.08.005
  15. Kil, H., Oh, S.-J., Kelley, M. C., Paxton, L. J., England, S. L., Talaat, E., Min, K.-W., & Su, S.-Y. 2007, GRL, 34, doi:10J029/2007GL030018
  16. Kil, H., Talaat, E. R., Oh, S.-J., Paxton, L. J., England, S. L., & Su, S.-Y., 2008, JGR, 113
  17. Lin, C. H.,Wang,W., Hagan,M. E.,Hsiao, C. C., Immel, T. J., Hsu, M. L., Liu, J. Y., Paxton, L. J., Fang, T. W., & Liu, C. H. 2007, GRL, 34, doi:10J029/2007GL029265
  18. Lynn, K. J. W., Sjarifudin, M., Harris, T. J., & Le Huy, M. 2004, Annales. Geophysicae, 22, 2837 https://doi.org/10.5194/angeo-22-2837-2004
  19. Oberheide, J. & Forbes, J. M. 2008, GRL, 35, doi:10J029/2007GL032397
  20. Oberheide, J., Wu, Q., Killeen, T. L., Hagan, M. E., & Roble, R. G. 2006, JGR, 111, doi:10J029/ 2005JA011491
  21. Oh, S.-J. 2007, Ph.D. dissertation, Seoul National University
  22. Richmond, A. D. 1995, Journal of Geomagnetism and Geoelectricity, 47, 191 https://doi.org/10.5636/jgg.47.191
  23. Sagawa, E., Immel, T. J., Frey, H. U., & Mende, S. B. 2005, JGR, 110, doi:10J029/2004JA010848
  24. Scherliess, L. & Fejer, B. G. 1999, JGR, 104, 6829 https://doi.org/10.1029/1999JA900025
  25. Scherliess, L., Thompson, D. C., & Schunk, R. W. 2008, JGR, 113, doi:10J029/2007JA012480
  26. Vladimer, J. A., Jastrezebski, P., Lee, M. C., Doherty, P. H., Decker, D. T., & Anderson, D. N. 1999, Radio Sciences, 34, 1239 https://doi.org/10.1029/1999RS900060
  27. Zhang, X., Forbes, J. M., Hagan, M. E., Russell III, J. M., Palo, S. E., Mertens, C. J., & Mlynczak, M. G. 2006, JGR, 111, doi:10J029/2005JA011504
  28. Zhu, L., Schunk, R. W., Jee, G., Scherliess, L., Sojka, J. J., & Thompson, D. C. 2006, Radio Sciences, 41, doi:10J029/2005RS003336

Cited by

  1. Assessment of GPS global ionosphere maps (GIM) by comparison between CODE GIM and TOPEX/Jason TEC data: Ionospheric perspective vol.115, pp.A10, 2010, https://doi.org/10.1029/2010JA015432
  2. The First Measurement of Seasonal Trends in the Equatorial Ionospheric Anomaly Trough at the CHUK GNSS Site During the Solar Maximum in 2014 vol.33, pp.4, 2016, https://doi.org/10.5140/JASS.2016.33.4.287
  3. Climatology of plasmaspheric total electron content obtained from Jason 1 satellite 2017, https://doi.org/10.1002/2016JA023444
  4. Seasonal and solar activity variations of the Weddell Sea Anomaly observed in the TOPEX total electron content measurements vol.114, pp.A4, 2009, https://doi.org/10.1029/2008JA013801