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Ion Acceleration by Parallel Propagating Nonlinear Alfvén Wave Pac...

By: T. K. Suzuki; T. Hada; T. Umeda; Y. Nariyuki

Description: Faculty of Human Development, University of Toyama, 3190, Toyama City, Toyama 930-8555, Japan. The numerical simulation of the nonlinear evolution of the parallel propagating Alfvén waves in a radially expanding plasma is performed by using a kinetic-fluid model (the Vlasov–MHD model). In our study, both the nonlinear evolution of the Alfvén waves and the radial evolution of the velocity distribution function (VDF) are treated simultaneously. On the othe...

Araneda, J. A., Marsch, E., and Vinas, A. F.: Proton Core Heating and Beam Formation via Parametrically Unstable Alfven-Cyclotron Waves, Phys. Rev. Lett., 100, 125003, doi:10.1103/PhysRevLett.100.125003, 2008.; Bale, S. D., Kasper, J. C., Howes, G. G., Quataert, E., Salem, C., and Sundkvist, D.: Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind, Phys. Rev. Le...

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Inversion of Sar Data in Active Volcanic Areas by Optimization Tec...

By: G. Puglisi; F. Guglielmino; G. Nunnari

Description: Department of Electrical, Electronic and System Engineering, University of Catania, Italy. The inversion problem concerns the identification of parameters of a volcanic source causing observable changes in ground deformation data recorded in volcanic areas. In particular, this paper deals with the inversion of ground deformation measured by using SAR (Synthetic Aperture Radar) interferometry and an inversion approach formulated in terms of an optimizati...

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Voyager 2 Observation of the Multifractal Spectrum in the Heliosph...

By: A. Wawrzaszek; W. M. MacEk

Description: Space Research Centre, Polish Academy of Science, Bartycka 18A, 00-716 Warsaw, Poland. We look in detail at the multifractal scaling of the fluctuations in the interplanetary magnetic field strength as measured onboard Voyager 2 in the entire heliosphere and even in the heliosheath. More specifically, we analyse the spectra observed by Voyager 2 in a wide range of solar activity cycles during the years 1980–2009 at various heliospheric latitudes and dis...

Belcher, J. W. and Davis, L., J.: Large-amplitude Alfvén waves in the interplanetary medium, 2, J. Geophys. Res., 76, 3534–3563, doi:10.1029/JA076i016p03534, 1971.; Borovsky, J. E.: Contribution of strong discontinuities to the power spectrum of the solar wind, Phys. Rev. Lett., 105, 111102, doi:10.1103/PhysRevLett.105.111102, 2010.; Bruno, R. and Carbone, V...

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Enhancing Predictability by Increasing Nonlinearity in Enso and Lo...

By: Z. Ye; W. W. Hsieh

Description: Department of Earth and Ocean Sciences, University of British Columbia Vancouver, BC V6T 1Z4, Canada. The presence of nonlinear terms in the governing equations of a dynamical system usually leads to the loss of predictability, e.g. in numerical weather prediction. However, for the El Niño-Southern Oscillation (ENSO) phenomenon, in an intermediate coupled equatorial Pacific model run under the 1961–1975 and the 1981–1995 climatologies, the latter climato...

An, S.-I. and Wang, B.: Interdecadal change of the structure of the ENSO mode and its impact on the ENSO frequency, J. Climate, 13, 2044–2055, 2000.; An, S.-I.: Interdecadal changes in the El~Niño La-Niña asymmetry, Geophys. Res. Lett., 31, L23210, doi:10.1029/2004GL021699, 2004.; An, S.-I. and Jin, F.-F.: Nonlinearity and asymmetry of ENSO, J. Climate, 17, 2399–2412, 2004.; Bishop, C. M.: Neural Networks for Pattern Recognition, Clarendon Press, 482~pp., 1995.; Chen, D....

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Statistical Characteristics of Irreversible Predictability Time in...

By: L. M. Ivanov; P. C. Chu

Description: Naval Ocean Analysis and Prediction Laboratory Department of Oceanography, Naval Postgraduate School Monterey, California, USA. Probabilistic aspects of regional ocean model predictability is analyzed using the probability density function (PDF) of the irreversible predictability time (IPT) (called Τ-PDF) computed from an unconstrained ensemble of stochastic perturbations in initial conditions, winds, and open boundary conditions. Two-attractors (a chaot...

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On Wave Turbulence in Mhd : Volume 8, Issue 3 (30/11/-0001)

By: A. C. Newell; S. V. Nazarenko; S. Galtier

Description: Mathematics Institute, University of Warwick, Coventry, CV4 7AL, UK. We describe the fundamental differences between weak (wave) turbulence in incompressible and weakly compressible MHD at the level of three-wave interactions. The main difference is in the structure of the resonant manifolds and the mechanisms of redistribution of spectral densities along the applied magnetic field B0. Similar to pure acoustic wa...

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Interaction Dynamics of Electrostatic Solitary Waves : Volume 6, I...

By: H. Matsumoto; Y. Omura; V. L. Krasovsky

Description: Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, Moscow 117810, Russia. Interaction of nonlinear electrostatic pulses associated with electron phase density holes moving in a collisionless plasma is studied. An elementary event of the interaction is analyzed on the basis of the energy balance in the system consisting of two electrostatic solitary waves. It is established that an intrinsic property of the system is a specific i...

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Long Waves Over a Bi-viscous Seabed: Transverse Patterns : Volume ...

By: D. Bercovici; J. M. Becker

Description: Department of Geology and Geophysics, University of Hawaii at Manoa, Honolulu, HI, USA. The coupled interaction of long standing hydrodynamic waves with a deformable non-Newtonian seabed is examined using a two-layer model for which the upper layer fluid is inviscid and the lower layer is bi-viscous. The two-dimensional response of the system to forcing by a predominantly longitudinal (cross-shore) standing wave perturbed by a small trans...

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Nonlinear Analysis of Magnitude and Interevent Time Interval Seque...

By: T. Matcharashvili; T. Chelidze; Z. Javakhishvili

Description: Institute of Geophysics, Georgian A. Sci. I, Alexidze str. 380093 Tbilisi, Georgia. It is well known that lithospheric seismic processes are characterized by self-similarity or scale invariance in terms of earthquake-size, time, space and space-time distributions, although precise details of underlying dynamics are not clear. In this study we apply nonlinear dynamics theory tools, such as a correlation dimension, "surrogate" data analysis and positive L...

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Brief Communication: 2-d Numerical Modeling of the Transformation ...

By: X. Shao; Y. Xiao; S. F. Yang; X. M. Xu; W. X. Chen

Description: National Inland Waterway Regulation Engineering Research Center, Chongqing Jiaotong University, Chongqing, 400074, China. This paper investigates the controls on the transformation mechanism among different channel patterns. A 2-D depth-averaged numerical model is applied to produce the evolution of channel patterns with complex interactions among water flow, sediment transport, and bank erosion. Changes of the variables as discharge, sediment supply, a...

Ackers, P. and Charlton, F. G.: The geometry of small meandering streams, Inst. Civ. Eng. Proc., Suppl., xii, 28–317, 1970.; Ashmore, P. E.: Laboratory modeling of gravel braided stream morphology, Earth Surf. Proc., 7, 201–225, 1982.; Ashmore, P. E.: How do gravel-bed rivers braid?, Can. J. Earth Sci., 28, 326–341, 1991.; Beam, R. M. and Warming, R. F.: Factored, a-stable, linear multistep methods: an alternative to the method of lines for multidimensions, ACM Signum Ne...

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Flux-gradient Relationship for Turbulent Dispersion Over Complex T...

By: G. Tinarelli; D. Anfossi; F. Trombetti; U. Giostra; F. Tampieri; E. Ferrero

Description: Istituto FISBAT/CNR, Via Gobetti 101, 40129 Bologna, Italy. The transfer of a passive tracer in inhomogeneous turbulent flow is investigated. Starting from Lumley's constitutive equation, we derived an expression for the ratio between the effective eddy diffusivity K and eddy diffusivity K as a function of three length scales characterizing the local turbulence structure, flux variations and turbulence inhomogeneities. The theoretical pre...

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Gottwald Melborune (0–1) Test for Chaos in a Plasma : Volume 19, I...

By: S. Lahiri; D. R. Chowdhury; A. N. S. Iyengar

Description: Techno India, EM4/1, Sector V, Kolkata-700091, India. Plasma is a highly complex system exhibiting a rich variety of nonlinear dynamical phenomena. In the last two decades or so there has been a spurt of growth in exploring unconventional nonlinear dynamical methods of analysis, like chaos theory, multi fractal analysis, self organized criticality etc. of experimental data from different plasma systems. Investigation of fluctuating plasma parameters is...

Cheung, P. Y. and Wong, A. Y.: Chaotic behaviour and periodic doubling in plasmas, Phys. Rev. Lett., 59, 551–554, 1987.; Ding Weixing, Huang Wei, Wang Xiaodong, and C. X. Yu: Chaos in glow discharge plasma, Phys. Rev. Lett. 70, 170–173,1993.; Dinklage, A., Wilke, C., and Klinger, T.: Spatiotemporal response of stochastic resonance in an excitable discharge plasma, Phys. Plasmas, 6, 2968–2971, 1999.; Gottwald, G. A. and Melbourne, I.: A new test for chaos in a determinist...

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Equilibrium Temperature Distribution and Hadley Circulation in an ...

By: N. Tartaglione

Description: School of Science and Technology, University of Camerino, Camerino, Italy. The impact of the equilibrium temperature distribution, ΘE, on the Hadley circulation simulated by an axisymmetric model is studied. The ΘE distributions that drive the model are modulated here by two parameters, n and k, the former controlling the horizontal broadness and the latter controlling the vertical stratification of ΘE. In ...

Fang, M. and Tung, K. K.: Time-dependent nonlinear Hadley circulation, J. Atmos. Sci., 56, 1797–1807, 1999.; Farrell, B. F.: Equable Climate Dynamics, J. Atmos. Sci., 47, 2986–2995, 2.0.CO;2>doi:10.1175/1520-0469(1990)047<2986:ECD>2.0.CO;2, 1990.; Kim, H.-K. and Lee, S.: Hadley cell dynamics in a primitive equation model, Part II: Nonaxisymmetric flow, J. Atmos. Sci., 58, 2859–2871, 2001.; Lindzen, R. S. a...

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Mapping Local Singularities Using Magnetic Data to Investigate the...

By: Q. Cheng; T. Liu; Y. Yang; G. Chen

Description: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China. The spatial structural characteristics of geological anomaly, including singularity and self-similarity, can be analysed using fractal or multifractal modelling. Here we apply the multifractal methods to potential fields to demonstrate that singularities can characterise geological bodies, including rock density and magnetic suscepti...

Agterberg, F. P.: Multifractals and geostatistics, J. Geochem. Explor., 122, 113–122, doi:10.1016/j.gexplo.2012.04.001, 2012.; Benzi, R., Paladin, G., Parisi, G., and Vulpiani, A.: On the multifractal nature of fully developed turbulence and chaotic systems, J. Phys. A-Math. Gen., 17, 3521, doi:10.1088/0305-4470/17/18/021, 1984.; Chen, J. G., Xiao, F., and...

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The Effect of a Localized Geothermal Heat Source on Deep Water For...

By: E. Barsy; A. Várai; I. M. Jánosi; M. Vincze

Description: von Kármán Laboratory for Environmental Flows, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary. In a simplified two-dimensional model of a buoyancy-driven overturning circulation, we numerically study the response of the flow to a small localized heat source at the bottom. The flow is driven by differential thermal forcing applied along the top surface boundary. We evaluate the steady state solutions versus the temperature difference ...

Ganachaud, A. and Wunsch, C.: Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data, Nature, 408, 453–457, 2000.; van Aken, H. M.: The Oceanic Thermohaline Circulation: An Introduction, Atmospheric and Oceanographic Sciences Library, 39, 121–151, doi:10.1007/978-0-387-48039-8-7, 2007.; Arakawa, A. and Lamb, V.: Computational design of the basic dynamical processes of the ...

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Detecting Unstable Structures and Controlling Error Growth by Assi...

By: F. Uboldi; A. Trevisan

Description: no current affiliation. Oceanic and atmospheric prediction is based on cyclic analysis-forecast systems that assimilate new observations as they become available. In such observationally forced systems, errors amplify depending on their components along the unstable directions; these can be estimated by Breeding on the Data Assimilation System (BDAS). Assimilation in the Unstable Subspace (AUS) uses the available observations to estimate the amplitude ...

Brasseur, P., Ballabrera-Poy, J., and Verron, J.: Assimilation of altimetric data in the mid-latitude oceans using the Singular Evolutive Extended Kalman Filter with an eddy-resolving, primitive equation model, J. Mar. Syst., 22, 269-294, 1999.; Evensen, G.: Sampling strategies and square root analysis schemes for EnKF, Ocean Dynamics, 54, 539-560, 2004.; Bennett, A F.: Inverse methods in physical oceanography, Cambridge University Press, 1992.; Bennett, A F.: Inverse Mo...

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Horton Laws for Hydraulic-geometric Variables and Their Scaling Ex...

By: O. J. Mesa; V. K. Gupta

Description: Department of Civil, Environmental and Architectural Engineering and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA. An analytical theory is presented to predict Horton laws for five Hydraulic-Geometric (H-G) variables (stream discharge Q, width W, depth D, velocity U, slope S, and friction n'). The theory builds on the concept of dimensional analysis, ...

Jarvis, R. S. and Woldenberg, M. J.: River networks, vol. 80, Hutchinson Ross, New York, USA, 1984.; Barenblatt, G. I.: Scaling, self-similarity, and intermediate asymptotics, Cambridge Univ Pr, 1996.; Berry, M. and Bradley, P.: The application of network analysis to the study of branching patterns of large dendritic fields, Brain Res., 109, 111–132, 1976.; Borchert, R. and Slade, N. A.: Bifurcation ratios and the adaptive geometry of trees, Botanical Gazette, 142, 394–4...

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Rank-ordered Multifractal Analysis (Roma) of Probability Distribut...

By: T. Chang; C. C. Wu

Description: Institute of Geophysics and Planetary Physics, University of California at Los Angeles, Los Angeles, CA 90095, USA. Rank-Ordered Multifractal Analysis (ROMA) was introduced by Chang and Wu (2008) to describe the multifractal characteristic of intermittent events. The procedure provides a natural connection between the rank-ordered spectrum and the idea of one-parameter scaling for monofractals. This technique has successfully been applied to MHD turbule...

Bruno, R., Carbone. V, Veltri, P., Pietropaolo, E., and Bavassano, B.: Identifying intermittency events in the solar wind, Planetary Space Sci., 49, 1201–1210, 2001.; Bruno, R., Carbone, V., Sorriso-Valvo, L., and Bavassano, B.: Radial evolution of solar wind intermittency in the inner heliosphere, J. Geophys. Res., 108, 1130, doi:10.1029/2002JA009615, 2003.; Castaing, B., Gagne, Y., and Hopfinger, E. J.: Velocity probab...

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Distribution of Incremental Static Stress Caused by Earthquakes : ...

By: Y. Y. Kagan

Description: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90024-1567, USA. Theoretical calculations, simulations and measurements of rotation of earthquake focal mechanisms suggest that the stress in earthquake focal zones follows the Cauchy distribution which is one of the stable probability distributions (with the value of the exponent α equal to 1). We review the properties of the stable distributions and show th...

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Using Modern Time Series Analysis Techniques to Predict Enso Event...

By: M. Wimbush; J. I. Salisbury

Description: Echo Technology, PO. Box 527, Chepachet, RI, USA. We analyze the monthly 1866-2000 Southern Oscillation Index (SOI) data to determine:

1) whether the SOI data are sufficiently noise-free that useful predictions can be made from them, and

2) in particular, whether future ENSO events can be predicted from the SOI data. 

The "Hilbert-EMD" technique is used to aid the analysis. This new frequency-time algorithm...

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