Time signatures of impulsively generated waves in a coronal plasma     

K. Murawski  B. Roberts 《Solar physics》1994,151(2):305-317

Impulsively generated waves in solar coronal loops are numerically simulated in the frame-work of cold magnetohydrodynamics. Coronal inhomogeneities are approximated by gas density slabs embedded in a uniform magnetic field. The simulations show that an initially excited pulse results in the propagation of wave packets which correspond to both trapped and leaky waves. Whereas the leaky waves propagate outside the slab, the trapped waves occur as a result of a total reflection from the slab walls. Time signatures of these waves are made by a detection of the trapped waves at a fixed spatial location. For waves excited within the slab, time signatures exhibit periodic, quasi-periodic and decay phases. The time signatures for waves excited outside the slab, or for a multi-series of variously shaped impulses generated at different places and times, can possess extended quasi-periodic phases. The case of parallel slabs, when the presence of a second slab influences the character of wave propagation in the first slab, exhibits complex time signatures as a result of solitary waves interaction.  相似文献   

Effort distribution and catch patterns adjacent to temperate MPAs   总被引：7，自引：2，他引：7  

Murawski  Steven A.; Wigley  Susan E.; Fogarty  Michael J.; Rago  Paul J.; Mountain  David G. 《ICES Journal of Marine Science》2005,62(6):1150-1167

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Definition and analysis of multispecies otter-trawl fisheries off the northeast coast of the United States     

Murawski  S. A.; Lange  A. M.; Sissenwine  M. P.; Mayo  R. K. 《ICES Journal of Marine Science》1983,41(1):13-27

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Zur Frage durchgepauster Tektonik     

Hans Murawski 《International Journal of Earth Sciences》1959,48(1):260-271

Zusammenfassung Es wird versucht, eine Vorstellung über die Möglichkeit der Durchpausung präexistierender flächiger oder körperhafter Inhomogenitäten eines tieferen Stockwerkes in das darüberliegende Deckgebirge bei neuerlicher Beanspruchung zu gewinnen. Zu diesem Zweck werden zunächst einige Beispiele, das Verhältnis von Tektonik und Vulkanismus betreffend, betrachtet. Schließlich wird an zwei konkreten Beispielen (Nordschwarzwald und Spessart) eine etwas eingehendere Analyse unternommen. Es läßt sich dabei die komplexe Natur von Art und Grad der Durchpausung erkennen, so daß bei ihrer Beurteilung größte Vorsicht am Platze ist. Ähnliches gilt für alle mit der Posthumität in der Tektonik zusammenhängende Fragen.  相似文献   

Impulsively generated MHD waves and their detectability in solar coronal loops     

Murawski  K.  Aschwanden  M. J.  Smith  J. M. 《Solar physics》1998,179(2):313-326

Impulsively generated magnetohydrodynamic waves in solar coronal loops, with arbitrary plasma , are studied numerically by a flux-corrected transport algorithm. Numerical results show that the total reflection which occurs in the region of low Alfvén speed leads to trapped fast kink magnetosonic waves. These waves propagate along the slab and exhibit periodic, quasi-periodic, and decay phases. As a consequence of the difference in wave propagation speeds, the time signatures of the slow magnetosonic waves are delayed in time in comparison to the time signatures of the fast magnetosonic and Alfvén waves. An interaction between the waves can generate a longer lasting and complex quasi-periodic phase of the fast wave. We discuss also the observational detectability of such MHD waves in optical, radio, and soft X-ray wavelenghts.  相似文献   

Numerical Simulations of Vertical Oscillations of a Curved Coronal Loop     

K. Murawski  M. Selwa  J. A. Rossmanith 《Solar physics》2005,231(1-2):87-94

We consider an impulsively-started, vertical excitation of a solar coronal loop that is embedded into a potential arcade. The two-dimensional numerical model we implement includes the effects of line curvature and allows us to explore the effect of varying the initial pulse position. The results of the numerical simulations reveal kink mode oscillations with waveperiods that are reasonably close to the observational findings of Wang and Solanki (2004).  相似文献   

Zusammenhänge Zwischen Basaltvulkanismus und Tektonik in Niedersachsen     

Hans Murawski 《International Journal of Earth Sciences》1951,39(1):114-119

Ohne Zusammenfassung  相似文献   

4. Das Kambro-Silur am Nordrand der innersudetischen Mulde     

Hans Murawski 《International Journal of Earth Sciences》1943,34(1):35-37

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MHD surface waves in a complex (longitudinal + sheared) magnetic field     

I. Zhelyazkov  K. Murawski  M. Goossens 《Solar physics》1996,165(1):99-114

We study the dispersion characteristics of fast MHD surface waves travelling on a plasma slab immersed in a complex magnetic field consisting of a large longitudinal B _0z component and a small sheared B _0y component. The analysis shows that for typical coronal conditions both the sausage and kink waves are generally pseudo-surface waves. The tangential magnetic field, B _0y , modifies the dispersion curves, and for sufficiently large sheared fields there is a transition from pseudo-surface to pure-surface fast kink waves.On leave from Faculty of Physics, Sofia University, BG-1126 Sofia, Bulgaria.  相似文献   

Impacts of demographic variation in spawning characteristics on reference points for fishery management   总被引：3，自引：3，他引：3  

Murawski  S. A.; Rago  P. J.; Trippel  E. A. 《ICES Journal of Marine Science》2001,58(5):1002-1014

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