Differences in magnetic storm and quiet ionospheric deterministic chaotic behavior: GPS total electron content analyses

摘要: [1] In the present study we have investigated whether deterministic chaotic behavior is exhibited by GPS total electron content (TEC) fluctuations at midlatitude ionosphere, under various geophysical conditions, using nonlinear aspects. Local slopes of logarithms correlation sum for time series TEC representing winter storm and quiet periods exhibit a clear plateau, indicating fractal dimension attractor system (5.86 ± 0.09 4.15 0.03 time, 35°N). The observed positive values Lyapunov exponent (for times 35.1°N, are 0.1695 × 10−2 s−1 0.1167 s−1, respectively) another important criterion chaoticity during above periods. To further confirm this, employed surrogate data test. On basis significance difference original surrogates aspects, test rejects null hypothesis that represent linear stochastic process. Also, compared disturbed periods, different seasons latitudes. For all seasons, greater than those latitude sector, 35°–41°N. aspects presented here imply geomagnetic disturbances influence stability/instability conditions ionosphere due to superposition active degrees freedom generated an external driver (solar wind), could alter inherent dynamics system, if coupling powerful.