Cosmic Research

, Volume 52, Issue 4, pp 251–259 | Cite as

Variations of ionospheric fluctuations of phase delay depending on solar activity: Data of the COSMIC experiment

Article

Abstract

We present the results of processing and analysis of more than 4500 events of radio occultation sounding of the Earth’s atmosphere observed in the course of the COSMIC experiment on the limb path ‘satellite-ionosphere-satellite’. Events observed in December 2011 (when a number of solar flares occurred) and in January 2012 (when a strong solar proton event took place) were analyzed. It is shown that small-scale variations of electron density increase in polar latitudes, equatorial region, and midlatitudes of the southern hemisphere in January 2012. In the same period, an increase of large-scale variations of electron density is observed during daylight hours in the equatorial region and in the southern hemisphere. No noticeable distinctions in comparison with days of quiet Sun were observed in December 2011.

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References

  1. 1.
    Anthes, R.A., Exploring Earth’s atmosphere with radio occultation: Contributions to weather, climate, and space weather, Atmospheric Measurement Techniques, 2011, vol. 4, no. 6, pp. 1077–1103.ADSCrossRefGoogle Scholar
  2. 2.
    Liu, J.Y., Lin, C.Y., Lin, C.H., et al., Artificial plasma cave in the low-latitude ionosphere results from the radio occultation inversion of the FORMOSAT-3/COS-MIC, J. Geophys. Res., Space Physics, 2010, vol. 115, A07319. doi: 10.1029/2009JA015079ADSGoogle Scholar
  3. 3.
    Hajj, G.A. and Romans, L.J., 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.ADSCrossRefGoogle Scholar
  4. 4.
    Vorob’ev, V.V., Gurvich, A.S., Kan, V., et al., Structure of the ionosphere according to radio occultation by GPS satellites Microlab-1: Preliminary results, Issled. Zemli Kosmosa, 1997, no. 4, pp. 74–83.Google Scholar
  5. 5.
    Gorbunov, M.E., Gurvich, A.S., and Shmakov, A.V., Back-propagation and radio-holographic methods for investigation of sporadic ionospheric E-layers from Microlab-1 data, International Journal of Remote Sensing, 2002, vol. 23, no. 4, pp. 675–685.ADSCrossRefGoogle Scholar
  6. 6.
    Pavelyev, A.G., Tsuda, T., Igarashi, K., et al., Wave structures in the electron density profile in the ionospheric D and E-layers observed by radio holography analysis of the GPS/MET radio occultation data, J. Atmos. Sol.-Terr. Phys., 2003, vol. 65, no. 1, pp. 59–70.ADSCrossRefGoogle Scholar
  7. 7.
    Yakovlev, O.I., Matyugov, S.S., Anufriev, V.A., and Cherkunova, G.P., Sporadic structures and small-scale irregularity in the nighttime polar ionosphere in the period of high solar activity according to the data of radio occultation measurements on satellite-to-satellite paths, Kosm. Issled., 2009, vol. 47, no. 4, p. 291. [Cosmic Research, pp. 259–267].Google Scholar
  8. 8.
    Sokolovskiy, S., Schreiner, W., Rocken, C., and Hunt, D., Detection of high-altitude ionospheric irregularities with GPS/MET, Geophys. Res. Lett., 2002, vol. 29, no. 3. doi: 10.1029/2001GLO13398Google Scholar
  9. 9.
    Vorob’ev, V.V. and Krasil’nikova, T.G., Estimation of accuracy of reconstruction of atmospheric refractive index from Doppler frequency shift measurements on frequencies used in the NAVSTAR system, Izv. Akad. Nauk SSSR. Fizika Atmosfery i Okeana, 1993, vol. 29, no. 5, pp. 626–632.Google Scholar
  10. 10.
    Syndergaard, S., On the ionosphere calibration in GPS radio occultation measurements, Radio Sci., 2000, vol. 35, no. 3, pp. 865–883.ADSCrossRefGoogle Scholar
  11. 11.
    Vorob’ev, V.V. and Kan, V., Background fluctuations at radio occultation of the ionosphere in the GPS-Microlab-1 experiment, Izv. Vyssh. Uchebn. Zaved., Radiofiz., 1999, vol. 42, no. 6, pp. 511–523.Google Scholar
  12. 12.
    Gorbunov, M.E., Ionospheric correction and statistical optimization of radio occultation data, Radio Sci., 2002, vol. 37, no. 5. doi: 10.1029/2000RS002370Google Scholar
  13. 13.
    Sokolovskiy, S.V., Tracking tropospheric radio occultation signals from low Earth orbit, Radio Sci., 2001, vol. 36, no. 3, pp. 483–498.ADSCrossRefGoogle Scholar
  14. 14.
    Kravtsov, Yu.A. and Orlov, Yu.I., Geometricheskaya optika neodnorodnykh sred (Geometrical Optics of Inhomogeneous Media), Moscow: Nauka, 1980.Google Scholar
  15. 15.
    Gorbunov, M.E., Perturbation methods in geometrical optics, Izv. Vyssh. Uchebn. Zaved., Radiofiz., 1995, vol. 38, no. 7, pp. 660–667.Google Scholar
  16. 16.
    Hedin, E., Extension of the MSIS thermosphere model into the middle and lower atmosphere, J. Geophys. Res., 1991, vol. 96, no. A2, pp. 1159–1172.ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  1. 1.Obukhov Institute of Physics of the AtmosphereRussian Academy of SciencesMoscowRussia

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