caa a22 4500 477064043 CHVBK 20180405111407.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00192070 doi (NATIONALLICENCE)springer-10.1007/BF00192070 Nonlinear time series analysis of the ionospheric measurements [Elektronische Daten] [A. Karpenko, N. Manaenkova] The applications of the tools of nonlinear time-series analysis to measurements obtained by digital ionosonde "PARUS,” created at IZMIRAN, is considered. Small-scale structure of the electron density Ne at F-region of ionosphere is examined by exploring observables of reflected high-frequency radio wave. Time series corresponding to given transmitter frequency f and virtual height h and conforming to usual, not perturbed, day ionogram are examined. Using the standard correlation algorithm, we have determined that for an embedding dimension n = 15, computed correlation dimension D2(n) reaches its saturation, D2 ≃ 4. Reliability of the estimation of the correlation dimension was confirmed by applying to our sets of measurements J. Theiler's modification of standard algorithm. The test of time difference, smoothing procedure, calculation of the largest Liapounov exponent, and analysis of the surrogate data were employed in our study of data sets. Although our sets of measurements contain a significant "random noise”, nonlinear time-series analysis clear up, that the dynamics of unperturbed ionosphere, generating this time series, exhibits low-dimensional behavior. Springer-Verlag, 1996 Ionosphere irregularities nationallicence Radiowave propagation nationallicence Ionosonde nationallicence Ionogram nationallicence Attractor Fractal dimension nationallicence Correlation algorithm Liapounov exponent nationallicence Karpenko A. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, IZMIRAN, 142092, Troitsk, Moscow Region, Russia aut Manaenkova N. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, IZMIRAN, 142092, Troitsk, Moscow Region, Russia aut Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 124-129 0016-7835 85:1<124 1996 85 531 https://doi.org/10.1007/BF00192070 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00192070 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karpenko A. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, IZMIRAN, 142092, Troitsk, Moscow Region, Russia aut NATIONALLICENCE 700 1- Manaenkova N. Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, IZMIRAN, 142092, Troitsk, Moscow Region, Russia aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 124-129 0016-7835 85:1<124 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer