Differences in daytime and nighttime ionospheric deterministic chaotic behavior: GPS total electron content analyses

Details Differences in daytime and nighttime ionospheric deterministic chaotic behavior: GPS total electron content analyses Differences in daytime and nighttime ionospheric deterministic chaotic behavior: GPS total electron content analyses

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11107310u&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A7, CiteID A07310

Physics

Plasma Physics

5

Space Plasma Physics: Chaos (4420), Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Storms (7949), Ionosphere: Midlatitude Ionosphere

Scientific paper

A study on the differences in deterministic chaotic behavior of midlatitude ionosphere during local daytime and nighttime, using GPS total electron content (TEC), under various geophysical conditions, is conducted. The noninteger value of correlation dimension, the positive value of Lyapunov exponent, the power spectra in broadband, etc., and the implementation of surrogate data test strongly indicate the chaoticity of the underlying dynamics of ionosphere. The values of correlation dimension obtained for daytime and nighttime TEC of a major storm period in winter measured at 35.1°N are 3.25 +/- 0.03 and 2.35 +/- 0.05, respectively, which indicate the fractal dimension of the attractor. The values of Lyapunov exponent are estimated as 0.1387 × 10-2 s-1 and 0.0979 × 10-2 s-1 for the above time series during daytime and nighttime, respectively. It is observed that at the lower sector (32.1-38.1°N), Lyapunov exponents of daytime are higher than those of nighttime, during a major storm period. The values of nonlinear prediction error during nighttime are higher than those of daytime for all the latitudes, except at 32.1°N, where the trend is opposite. During winter quiet times, the values of Lyapunov exponent of nighttime at the lower sector (32.1-38.1°N) have higher values than those of daytime, where as at the upper section (41.1-44.1°N), both have the same values. During equinoctial quiet times also, the above trend exists, by exhibiting higher values of Lyapunov exponent for nighttime compared to those of daytime, especially at the upper latitude sector (38.1-44.1°N) of the present study. The values of nonlinear prediction error, during quiet times in winter and equinox, generally show higher values at daytimes, compared to those at nighttimes. However, during summer, the opposite trend is observed, with higher values of the above parameter at daytime compared to those at nighttime, except at 32.1°N. This is a case study in a broad sense and the results presented here are based on the observations made for each event. The possible causes of chaotic aspects of ionosphere, based on the values of above quantifiers under various geophysical conditions, are discussed.

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