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Theory of Localized Bipolar Wave-structures and Nonthermal Particl...

By: M. M. Oppenheim; D. L. Newman; M. V. Goldman

Description: Center for Integrated Plasma Studies, University of Colorado, Boulder, CO 80309-0390, USA. Bipolar wave structures and nonthermal particle distributions measured by the FAST satellite in regions of downward current are interpreted in terms of the nonlinear evolution of a two-stream instability. The instability results in holes, both in the electron distribution in phase space and in the electron density in real space. The wave potential energy, which tr...

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Multiple Scale Error Growth in a Convection-resolving Model : Volu...

By: A. Trevisan; F. Uboldi

Description: Independent researcher, Milano, Italy. The properties of the multiple scale instabilities present in a non-hydrostatic forecast model are investigated. The model simulates intense convection episodes occurring in Northern Italy. A breeding technique is used to construct ensembles of perturbations of the model trajectories aimed to represent the instabilities that are responsible for error growth at various time and space scales. It is found that for in...

National Centers for Environmental Prediction, http://www.emc.ncep.noaa.gov/index.php?branch=GFS, last access: 26 March 2014.; Previsioni meteorologiche GLOBO BOLAM MOLOCH CNR-ISAC, http://www.isac.cnr.it/dinamica/projects/forecasts/index, last access: 26 March 2014.; Baldauf, M., Seifert, A., Förstner, J., Majewski, D., and Raschendorfer, M....

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Features of Fluid Flows in Strongly Nonlinear Internal Solitary Wa...

By: T. Talipova; O. Kurkina; E. Churaev; A. Kurkin; S. Semin; E. Pelinovsky

Description: Nizhny Novgorod State Technical University n.a. R. Alekseev, Nizhny Novgorod, Russia. The characteristics of highly nonlinear solitary internal waves (solitons) are calculated within the fully nonlinear numerical model of the Massachusetts Institute of Technology. The verification and adaptation of the model is based on the data from laboratory experiments. The present paper also compares the results of our calculations with the calculations perfor...

Adcroft, A. J., Campin, J., Dutkiewicz, S., Evangelinos, C., Ferreira, D., Forget, G., Fox-Kemper, B., Heimbach, P., Hill, C., Hill, E., Hill, H., Jahn, O., Losch, M., Marshall, J. S., Maze, G., Menemenlis, D., and Molod, A.: MITgcm User Manual, MIT Department of EAPS, Boston, 464 pp., 2011.; Berntsen, J.: Users Guide for a modesplit σ-coordinate numerical ocean model, University of Bergen, Bergen, 51 pp., 2004.; Bogucki, D. J. and Redekopp, L. G.: A mechanism for sedime...

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Vertical Mixing and Coherent Anticyclones in the Ocean: the Role o...

By: A. Bracco; I. Koszalka; L. Ceballos

Description: Institute of Geosciences, University of Oslo, 1022 Blinden, 0315 Oslo, Norway. The role played by wind-forced anticyclones in the vertical transport and mixing at the ocean mesoscale is investigated with a primitive-equation numerical model in an idealized configuration. The focus of this work is to determine how the stratification impacts such transport.

The flows, forced only at the surface by an idealized wind forcing, are predominantly hor...

Arai, M. and Yamagata, T.: Asymmetric evolution of eddies in rotation shallow water, Chaos, 4, 163–173, 1994.; Arbic, B. K., Flierl, G. R., and Scott, R. B.: Cascade inequalities for forced-dissipated geostrophic turbulence, J. Phys. Oceanogr., 37, 1470–2177, 2007.; Babiano, A. and Provenzale, A.: Coherent vortices and tracer cascades in two-dimensional turbulence, J. Fluid Mech., 574, 429–448, 2007.; Bracco, A. and Pedlosky, J.: Vortex generation by topography in locall...

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Response of an Ocean-atmosphere Climate Model to Milankovic Forcin...

By: E. S. Posmentier

Description: Southhampton College of long Island University, Southhampton, NY 11968, USA. There is considerable evidence in support of Milankovic's theory that variations in high-latitude summer insolation caused by Earth orbital variations are the cause of the Pleistocene ice cycles. The enigmatic discrepancy between the spectra of Milankovic forcing and of Pleistocene climate variations is believed to be resolved by the slow, nonlinear response of ice sheets to cha...

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Reconnection Current Sheet Structure in a Turbulent Medium : Volum...

By: S. Murray; S. Pillsworth; G. Kowal; E. T. Vishniac; G. Eyink; A. Lazarian

Description: Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada. In the presence of turbulence, magnetic field lines lose their dynamical identity and particles entrained on field lines diffuse through space at a rate determined by the amplitude of the turbulence. In previous work (Lazarian and Vishniac, 1999; Kowal et al., 2009; Eyink et al., 2011) we showed that this leads to reconnection speeds which are independ...

Armstrong, J. W., Rickett, B. J., and Spangler, S. R.: Electron density power spectrum in the local interstellar medium, \apj, 443, 209–221, 1995.; Bale, S. D., Kellogg, P. J., Mozer, F. S., Horbury, T. S., and Reme, H.: Measurement of the Electric Fluctuation Spectrum of Magnetohydrodynamic Turbulence, \prl, 94, 215002, doi:10.1103/PhysRevLett.94.215002, 2005.; Burkhart, B., Lazarian, A., and Gaensler, B. M.: P...

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Seasonal Variability of the Subpolar Gyres in the Southern Ocean: ...

By: C. Horenkamp; G. Froyland; K. Padberg-gehle; M. Dellnitz; A. Sen Gupta

Description: Department of Mathematics, University of Paderborn, 33095 Paderborn, Germany. The detection of regions in the ocean that are coherent over an extended period of time is a fundamental problem in many oceanic applications. For instance such regions are important for studying the transport of marine species and for the distribution of nutrients. In this study we demonstrate the efficacy of transfer operators in detecting and analysing such structures. We f...

Aumont, O., Orr, J., Jamous, D., Monfray, P., Marti, O., and Madec, G.: A degradation approach to accelerate simulations to steady-state in a 3-D tracer transport model of the global ocean, Clim. Dynam., 14, 101–116, 1998.; Barnier, B., Madec, G., Penduff, T., Molines, J.-M., Treguier, A.-M., Sommer, J. L., Beckmann, A., Biastoch, A., Boening, C., Dengg, J., Derval, C., Durand, E., Gulev, S., Remy, E., Talandier, C., Theetten, S., Maltrud, M., McClean, J., and De Cuevasm...

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Elastic Envelope Inversion Using Multicomponent Seismic Data Witho...

By: B. Chi; Y. Liu; L. Dong; C. Huang

Description: State Key Laboratory of Marine Geology, Tongji University, Shanghai 20092, China. Low frequency is a key issue to reduce the nonlinearity of elastic full waveform inversion. Hence, the lack of low frequency in recorded seismic data is one of the most challenging problems in elastic full waveform inversion. Theoretical derivations and numerical analysis are presented in this paper to show that envelope operator can retrieve strong low frequency modulation ...

Baeten, G., de Maag, J. W., Plessix, R. E., Klaassen, R., Qureshi, T., Kleemeyer, M., ten Kroode, F., and Rujie, Z.: The use of low frequencies in a full-waveform inversion and impedance inversion land seismic case study, Geophys. Prospect., 61, 701–711, 2013.; Bunks, C., Saleck, F. M., Zaleski, S., and Chavent, G.: Multiscale seismic waveform inversion, Geophysics, 60, 1457–1473, 1995.; Bozdağ, E., Trampert, J., and Tromp, J.: Misfit functions for full waveform inversio...

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Analysis and Simulation of Bgk Electron Holes : Volume 6, Issue 3/...

By: C. W. Carlson; R. E. Ergun; I. Roth; L. Muschietti

Description: Space Sciences Laboratory, University of California, Berkeley, CA. 94720, USA. Recent observations from satellites crossing regions of magnetic-field-aligned electron streams reveal solitary potential structures that move at speeds much greater than the ion acoustic/thermal velocity. The structures appear as positive potential pulses rapidly drifting along the magnetic field, and are electrostatic in their rest frame. We interpret them as BGK electron h...

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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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Force Chain and Contact Cycle Evolution in a Dense Granular Materi...

By: C. A. H. Steer; D. M. Walker; A. Tordesillas

Description: Department of Mathematics and Statistics, University of Melbourne, Victoria 3010, Australia. The mechanical response of a dense granular material submitted to indentation by a rigid flat punch is examined. The resultant deformation is viewed as a process of self-organisation. Four aspects of the mechanical response (i.e. indentation resistance, failure, Reynolds' dilatancy, the undeforming dead zone) are explored with respect to the linear and cyclic st...

Ali, M. M. and Moon, K. S.: Structural developments in tall buildings: Current trends and future prospects, Architectural Science Review, 50, 205–223, 2007.; Barker, G. C. and Mehta, A.: Vibrated powders: Structure, correlations, and dynamics, Phys. Rev. A, 45, 3435–3446, 1992.; Biarez, J.: Contribution à l'étude des propriétés mécaniques des sols et des matériaux pulvérulents, Ph.D. thesis, L'université de Grenoble, France, 1962 (in French).; Bollobás, B.: Modern Graph ...

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Solitary Waves Observed in the Auroral Zone: the Cluster Multi-spa...

By: M. L. Goldstein; A. Balogh; B. Lavraud; P. M. E. Décréau; O. Santolík; R. Frahm; D. Winningham; Y. Khotyaintsev; L.-j. Chen; D. A. Gurnett; S. W. Kahler; R. L. Huff; J. S. Pickett; M. André; A. Fazakerley; B. T. Tsurutani; G. S. Lakhina; H. Rème

Description: Department of Physics and Astronomy, The University of Iowa, Iowa City, IA, USA. We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines that map to the auroral zones. These solitary waves are observed in the Wideband data as isolated bipolar and tripolar waveforms. Examp...

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Cellular Automaton for Realistic Modelling of Landslides : Volume ...

By: E. Segre; C. Deangeli

Description: Istituto di Cosmo-Geofisica del C.N.R., Torino, Italy. A numerical model is developed for the simulation of debris flow in landslides over a complex three dimensional topography. The model is then validated by comparing a simulation with reported field data. Our model is in fact a realistic elaboration of simpler "sandpile automata", which have in recent years been studied as supposedly paradigmatic of "self-organized criticality". Statistics and scalin...

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Oscillating Grids Turbulence Generator for Turbulent Transport Stu...

By: I. Rogachevskii; N. Kleeorin; T. Elperin; A. Kapusta; A. Krein; A. Eidelman

Description: The Pearslstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, P. O. Box 653, Beer-Sheva 84105, Israel. An oscillating grids turbulence generator was constructed for studies of two new effects associated with turbulent transport of particles, turbulent thermal diffusion and clustering instability. These effects result in formation of large-scale and small-scale inhomogene...

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Magnetic Field Turbulence, Electron Heating, Magnetic Holes, Proto...

By: J. K. Arballo; G. S. Lakhina; B. Dasgupta; B. T. Tsurutani; J. S. Pickett

Description: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. Two electron heating events have been identified on 20 May 1996 when Polar was in the polar cap/polar cusp boundary layer. The electron heating events were located within magnetic holes/cavities/bubbles and were accompanied by nonlinear ± 14 nT peak-to-peak (f ~ 0.6 to 0.7 fcp) obliquely propagating proton cyclotron waves. The electrons appear to ...

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Solitary Wave in a Burridge-knopoff Model with Slip-dependent Fric...

By: Z. L. Wu; Y. T. Chen

Description: Institute of Geophysics, China Seismological Bureau, 100081 Beijing, China. A one-dimensional Burridge-Knopoff spring-block model with slip-dependent friction was studied to explore the possibility of a solitary wave solution existing for the problem of earthquake faulting. The result may be used as an alternative case of the crack model (e.g., Madariaga and Cochard, 1996) and the spring-block model with velocity-dependent friction (e.g., Carlson and La...

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Extreme Event Return Times in Long-term Memory Processes Near 1/F ...

By: K. Fraedrich; F. Sienz; R. Blender

Description: Universität Hamburg, Meteorologisches Institut, Bundesstrasse 55, 20146 Hamburg, Germany. The distribution of extreme event return times and their correlations are analyzed in observed and simulated long-term memory (LTM) time series with 1/f power spectra. The analysis is based on tropical temperature and mixing ratio (specific humidity) time series from TOGA COARE with 1 min resolution and an approximate 1/f power spectrum. Extreme event...

%Kuznetsov, E. A., Passot, T., and Sulem, P. L.: A dynamical model %for nonlinear mirror modes near threshold, Phys. Rev. Lett., 98, %235003(1�4), 2007.; Abaimov, S. G., Turcotte, D. L., Shcherbakov, R., and Rundle, J. B.,: Recurrence and interoccurrence behavior of self-organized complex phenomena, Nonlin. Processes Geophys., 14, 455–464, 2007.; Altmann, E. G. and Kantz, H.: Recurrence time analysis, long-term correlations, and extreme events, Phys. Rev. E, 71, 056106, ...

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Dinoflagellate Bioluminescence in Response to Mechanical Stimuli i...

By: A. S. Cussatlegras; P. Le Gal

Description: DIMAR, UMR 6540 CNRS-Universit´e de la Méditerranée, Centre d’Océanologie de Marseille, Parc Scientifique et technologique de Luminy, Case 901, 13288 Marseille cedex 9, France. Bioluminescence of plankton organisms induced by water movements has long been observed and is still under investigations because of its great complexity. In particular, the exact mechanism occurring at the level of the cell has not been yet fully understood. This work is devoted t...

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The Modified Korteweg - De Vries Equation in the Theory of Large -...

By: E. Pelinovsky; T. Talipova; R. Grimshaw

Description: Department of Mathematics and Statistics, Monash University, Clayton, 3168, Victoria, Australia. The propagation of large- amplitude internal waves in the ocean is studied here for the case when the nonlinear effects are of cubic order, leading to the modified Korteweg - de Vries equation. The coefficients of this equation are calculated analytically for several models of the density stratification. It is shown that the coefficient of the cubic nonlinear...

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On Quartet Interactions in the California Current System : Volume ...

By: C. A. Collins; L. M. Ivanov; T. M. Margolina

Description: Naval Postgraduate School, Monterey, California, USA. Sea surface height (SSH) altimetry observations for 1992 to 2009 off California are used to show that observed quasi-zonal jets were likely driven by near-resonance interactions between different scales of the flow. Quartet (modulational) instability dominated and caused non-local transfer of energy from waves and eddies to biannual oscillations and quasi-zonal jets. Two types of quartets were identi...

Aubry, N., Guyonett, R., and Lima R.: Spatio-temporal analysis of complex signals: theory and applications, J. Stat. Phys., 64, 683–739, 1991.; Baldwin, M. P., Gray, L. G., Dunkerton, T. J., Hamilton, K., Haynes, P. H., Randel, W. J., Holton, J. R., Alexander, M. J., Hirota, I., Horinouchi, T., Jones, D. B. A., Kinnersley, J. S., Marquardt, C., Sao, K., and Takahasi, M.: The Quasi-Biennial Oscillation, Rev. Geophys., 39, 179–229, 2001.; Baldwin, M. P., Rhines, P., Huang,...

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