ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 1, pp. 75-84

Ionospheric parameters: FormoSat-3/COSMIC radio occultation data, ionosonde measurements, IRI and NeQuick model data

E.S. Andreeva1 , M.V. Lokotа1 
1 M.V. Lomonosov Moscow State University, Moscow, Russia
The results of comparisons of the IRI-2001, IRI-2007, NeQuick models with the radio occultation profiles for different geomagnetic conditions are reported. Our analysis showed that models NeQuick, IRI-2001, IRI-2007 rather well reproduce the maximum values of electron density and much worse electron density profiles. Values of VTEC, simulated by IRI and NeQuick models, in comparison with values calculated from radio occultation profiles are overestimated. The largest differences were detected in the region of the Equatorial anomaly. The best results were achieved in comparison with IRI-2007 model data.Verification results of FormoSat-3/COSMIC radio occultation data based on ionosonde measurements in different regions of the world during the period of 2006-2008 are presented. The discrepancy in the F2-layer critical frequencies from radio occultation profiles and ionosonde data increases with ionospheric storminess enhancement. Generally in comparison with radio occultation profiles ionosonds showed overestimated values. Large differences between the values of critical frequencies in Taiwan area both during disturbed and quiet geomagnetic conditions were observed.
Keywords: ionosphere, ionospheric models, radio occultation method, critical frequencies, electron density, totalelectron content
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References:

  1. Kunicyn V.E., E.D. Tereshhenko, E.S. Andreeva, Radiotomografija ionosfery (Radiotomography of ionosphere), Moscow: Fizmatlit, 2007.
  2. Jakovlev O.I., Kosmicheskaja radiofizika (Cosmic radiophysics), Moscow: Nauchnaja kniga, 1998.
  3. Bilitza D., B.W. Reinisch, International Reference Ionosphere 2007: Improvements and new parameters, Advances in Space Research, 2008, Vol. 42, pp. 599–609.
  4. Coïsson P., S.M. Radicella, R. Leitinger, B. Nava, Topside electron density in IRI and NeQuick: Features and limitations, Advances in Space Research, 2006, Vol. 37, pp. 937–942.
  5. Garcia-Fernandez M., M. Hernandez-Pajares, J.M. Juan, J. Sanz, Performance of the improved Abel transform to estimate electron density profiles from GPS occultation data, GPS Solution, 2005, Vol. 9, pp. 105–110.
  6. Hajj G.A., L.J. Remans, Ionospheric electron density profiles obtained with the Global Positioning System: Results from the GPS/MET experiment, Radio Sci., 1998, Vol. 33, No. 1, pp. 175–190.
  7. Jakowski N., K. Schlegel, C. Stolle1, M. Rietveld, Comparison of high latitude electron density profiles obtained with the GPS radio occultation technique and EISCAT measurements, Annales Geophysicae, 2004, Vol. 22, pp. 2015–2022.
  8. Jiuhou L., S. Syndergaard, A.G. Burns, C.S. Stanley, Comparison of COSMIC ionospheric measurements with ground based observations and model predictions: Preliminary results, J. Geophys. Res., 2007, Vol. 112, p. A07308, doi:10.1029/2006JA012240.
  9. Phinney R.A., Anderson D.L., The radio occultation method for studying planetary atmospheres, J. Geophys. Res., 1968, Vol. 73, No. 5, pp. 1819–1927.
  10. Radicella S.M., The NeQuick model genesis, uses and evolution, Annals of Geophysics, 2009, Vol. 52, No. 3/4, pp. 1049–1059.
  11. Tsai L.C., W.H. Tsai, Improvement of GPS/MET Ionospheric Profiling and Validation Using the Chung-Li Ionosonde Measurements and the IRI model, Terrestrial Atmospheric and Oceanic Science, 2004, Vol. 15, No. 4, pp. 589–607.