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Earth, Planets and Space

, Volume 58, Issue 1, pp 33–36 | Cite as

A global distribution of sporadic E events revealed by means of CHAMP-GPS occultations

  • M. Garcia-FernandezEmail author
  • T. Tsuda
Open Access
Article

Abstract

With the advent of the GPS/MET mission, the atmospheric sciences were given a new tool to enhance studies related to global and seasonal variations of different atmospheric parameters. In particular, it has proof valuable for the study of the ionospheric irregularities in the E layer, which before were performed basically on a local basis by ground based instruments. Using similar techniques applied to GPS/MET data to process the 50 Hz sampling rate GPS data to study the E layer electron density distribution, this work shows the global and seasonal distributions of the ionospheric irregularities of electron density, during high solar activity, by using the CHAMP satellite GPS data from January 1st 2002 to May 31st 2004. As pointed out by several theories on the E layer and previous studies with ground based data, the results presented here show that these irregularities have strong geographical and seasonal dependence, with enhancements in the auroral regions, in mid-latitudes and during the summer season.

Key words

Ionospheric irregularities E layer occultation CHAMP 

References

  1. Ahmad, B. and G. L. Tyler, The two-dimensional resolution kernel associated with retrieval of ionospheric and atmospheric refractivity profiles by Abelian inversion of radio occultation phase data, Radio Science, 33(1), 129–142, January–February 1998.CrossRefGoogle Scholar
  2. Hajj, G. A. and L. J. Romans, Ionosphere electron density profiles obtained with the Global Positioning System: Results from the GPS/MET experiment, Radio Science, 33, 175–190, 1998.CrossRefGoogle Scholar
  3. Hardy, K. R., G. A. Hajj, E. R. Kursinski, and R. Ibanez-Meier, Accuracies of atmospheric profiles obtained from GPS occultations, Proceedings of the ION GPS-93 Conference, 1545–1556, 1993.Google Scholar
  4. Hocke, K. and T. Tsuda, Gravity waves and Ionospheric irregularities over tropical convection zones observed by GPS/MET Radio Occultation, Geophys. Res. Lett., 28(14), 2815–2818, July 2001a.CrossRefGoogle Scholar
  5. Hocke, K. and T. Tsuda, Using GPS satellites to study plasma irregularities, GPS World, 34–36, July, 2001b.Google Scholar
  6. Hocke, K., K. Igarashi, M. Nakamura, P. Wilkinson, J. Wu, A. Pavelyev, and J. Wickert, Global Sounding of sporadic E layers by the GPS/MET radio occultation experiment, J. Atmos. Solar-Terr. Phys., 63, 1973–1980, 2001.CrossRefGoogle Scholar
  7. Hocke, K. and K. Igarashi, Structure of the Earth’s lower ionosphere observed by GPS/MET radio occultation, J. Geophys. Res., 107(A5), 2002.Google Scholar
  8. Mathews, J. D., Sporadic E: current views and recent progress, J. Atmos. Solar-Terr. Phys., 60, 413–435, 1998.CrossRefGoogle Scholar
  9. Schreiner, W. S., S. V. Sokolovskiy, C. Rocken, and D. C. Hunt, Analysis and validation of GPS/MET radio occultation data in the ionosphere, Radio Science, 34, 949–966, 1999.CrossRefGoogle Scholar
  10. Whitehead, J. D., The formation of the sporadic-E layer in the temperate zones, J. Atmos. Terr. Phys., 29, 49–58, 1961.CrossRefGoogle Scholar
  11. J. D. Whitehead, Recent work on mid-latitude and equatorial sporadic-E, J. Atmos. Terr. Phys., 51, 401–424, 1989.CrossRefGoogle Scholar

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2006

Authors and Affiliations

  1. 1.Research Institute for Sustainable HumanosphereKyoto UniversityJapan

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