F-region Pedersen conductivity deduced using the TIMED/GUVI limb retrievals

Article, Other literature type English OPEN
Kil , H. ; Demajistre , M. ; Paxton , L. J. ; Zhang , Y. (2006)
  • Publisher: European Geosciences Union
  • Journal: (issn: 1432-0576, eissn: 1432-0576)
  • Related identifiers: doi: 10.5194/angeo-24-1311-2006
  • Subject: Geophysics. Cosmic physics | Q | [ SDU.STU ] Sciences of the Universe [physics]/Earth Sciences | [ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean, Atmosphere | Science | Physics | QC1-999 | QC801-809

As a proxy of the Rayleigh-Taylor instability growth rate for equatorial plasma bubbles, we investigate the flux-tube integrated <I>F</I>-region Pedersen conductivity (&Sigma;<i><sub>P</sub><sup>F</sup></i>) using the electron density profiles (EDPs) provided by the Global Ultraviolet Imager (GUVI) on board the Thermosphere Ionosphere and Mesosphere Energetics and Dynamics (TIMED) satellite. The investigation is conducted using the EDPs obtained in the Atlantic sector at 19:00-22:00&nbsp;LT during 4&ndash;17&nbsp;August and 6-16&nbsp;December 2002. The seasonal difference of the strength and location of the equatorial ionization anomalies (EIAs) induces a significant difference in the deduced &Sigma;<i><sub>P</sub><sup>F</sup></i>. Much stronger EIAs are created at higher altitudes and latitudes in December rather than in August. At 19:00&ndash;20:00&nbsp;LT, the peak value of the &Sigma;<i><sub>P</sub><sup>F</sup></i> has 23 mhos at 1100 km apex height during 14&ndash;16&nbsp;December and 18mhos at 600 km during 15&ndash;17&nbsp;August. The &Sigma;<i><sub>P</sub><sup>F</sup></i> decreases as local time progresses. Therefore, &Sigma;<i><sub>P</sub><sup>F</sup></i> provides a preferred condition for the growth of bubbles to higher altitudes at 19:00-20:00&nbsp;LT than at later hours, in December rather than in August in the Atlantic sector.
  • References (16)
    16 references, page 1 of 2

    Abdu, M. A., Bittencourt, J. A., and Batista, I. S.: Magnetic declination control of the equatorial F-region dynamo electric field development and spread F, J. Geophys. Res., 86, 11 443-11 446, 1981.

    Abdu, M. A., Batista, I. S., and Sobral, J. H. A.: A new aspect of magnetic declination control of equatorial spread F and F-region dynamo, J. Geophys. Res., 97, 14 897-14 904, 1992.

    Christensen, A. B., Paxton, L. J., and Avery, S. et al.: Initial Observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED Satellite Mission, J. Geophys. Res., 108(A12), 1451, doi:10.1029/2003JA009918, 2003.

    DeMajistre, R., Paxton, L. J., Morrison, D., Yee, J.-H., Goncharenko, L., and Christensen, A.: Retrievals of nighttime electron density from TIMED Global Ultraviolet Imager (GUVI) measurements, J. Geophys. Res., 109, A05305, doi:10.1029/2003JA010296, 2004.

    Haerendel, G., Eccles, J. V., and Cakir, S.: Theory for modeling the equatorial evening ionosphere and the origin of the shear in the horizontal plasma flow, J. Geophys. Res., 97, 1209-1223, 1992.

    Kelley, M. C.: The Earth's Ionosphere, Academic Press, San Diego, California, 1989.

    Kil, H. and Heelis, R. A.: Global distribution of density irregularities in the equatorial ionosphere, J. Geophys. Res., 103, 407-417, 1998.

    Kil, H., DeMajistre, R., and Paxton, L. J.:F-region plasma distribution seen from TIMED/GUVI and its relation to the equatorial spread F activity, Geophys. Res. Lett., 31, L05810, doi:10.1029/2003GL018703, 2004a.

    Kil, H., Su, S.-Y., Paxton, L. J., Wolven, B. C., Zhang, Y., Morrison, D., and Yeh, H. C.: Coincident equatorial bubble detection by TIMED/GUVI and ROCSAT-1, Geophys. Res. Lett., 31, L03809, doi:10.1029/2003GL018696, 2004b.

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

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