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  • 1
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    Ophiolites and their Modern Oceanic Analogues (1992)
    London : The Geological Society
    Details
    Keywords: Ophiolith ; Dorsales océaniques ; Géologie sous-marine ; Mid-ocean ridges ; Ophiolites ; Petrologia Ignea ; Submarine geology
    Description / Table of Contents: L. M. Parson and B. J. Murton: Ophiolites and their modern oceanic analogues / Geological Society, London, Special Publications, 60:1-2, doi:10.1144/GSL.SP.1992.060.01.01 --- Robert J. Alexander and Gregory D. Harper: The Josephine ophiolite: an ancient analogue for slow- to intermediate-spreading oceanic ridges / Geological Society, London, Special Publications, 60:3-38, doi:10.1144/GSL.SP.1992.060.01.02 --- C. J. MacLeod and D. A. Rothery: Ridge axial segmentation in the Oman ophiolite: evidence from along-strike variations in the sheeted dyke complex / Geological Society, London, Special Publications, 60:39-63, doi:10.1144/GSL.SP.1992.060.01.03 --- R. C. Searle: The volcano-tectonic setting of oceanic lithosphere generation / Geological Society, London, Special Publications, 60:65-79, doi:10.1144/GSL.SP.1992.060.01.04 --- Ruth I. Rusby: GLORIA and other geophysical studies of the tectonic pattern and history of the Easter Microplate, southeast Pacific / Geological Society, London, Special Publications, 60:81-106, doi:10.1144/GSL.SP.1992.060.01.05 --- Jeffrey A. Karson and Alec T. Winters: Along-axis variations in tectonic extension and accommodation zones in the MARK Area, Mid-Atlantic Ridge 23°N latitude / Geological Society, London, Special Publications, 60:107-116, doi:10.1144/GSL.SP.1992.060.01.06 --- Rex N. Taylor, Bramley J. Murton, and Robert W. Nesbitt: Chemical transects across intra-oceanic arcs: implications for the tectonic setting of ophiolites / Geological Society, London, Special Publications, 60:117-132, doi:10.1144/GSL.SP.1992.060.01.07 --- D. K. Kostopoulos and B. J. Murton: Origin and distribution of components in boninite genesis: significance of the OIB component / Geological Society, London, Special Publications, 60:133-154, doi:10.1144/GSL.SP.1992.060.01.08 --- Randall A. Keller and Martin R. Fisk: Quaternary marginal basin volcanism in the Bransfield Strait as a modern analogue of the southern Chilean ophiolites / Geological Society, London, Special Publications, 60:155-169, doi:10.1144/GSL.SP.1992.060.01.09 --- J. L. Smellie and P. Stone: Geochemical control on the evolutionary history of the Ballantrae Complex, SW Scotland, from comparisons with recent analogues / Geological Society, London, Special Publications, 60:171-178, doi:10.1144/GSL.SP.1992.060.01.10 --- Paul Ballantyne: Petrology and geochemistry of the plutonic rocks of the Halmahera ophiolite, eastern Indonesia, an analogue of modern oceanic forearcs / Geological Society, London, Special Publications, 60:179-202, doi:10.1144/GSL.SP.1992.060.01.11 --- Stephen Roberts: Influence of the partial melting regime on the formation of ophiolitic chromitite / Geological Society, London, Special Publications, 60:203-217, doi:10.1144/GSL.SP.1992.060.01.12 --- E. Valsami and J. R. Cann: Mobility of rare earth elements in zones of intense hydrothermal alteration in the Pindos ophiolite, Greece / Geological Society, London, Special Publications, 60:219-232, doi:10.1144/GSL.SP.1992.060.01.13 --- Roger Laurent: Peridotite intrusions emplaced in the fossil suprasubduction zone environment of Cyprus / Geological Society, London, Special Publications, 60:233-239, doi:10.1144/GSL.SP.1992.060.01.14 --- Jacques Girardeau and Jean-Claude C. Mercier: Evidence for plagioclase-lherzolite intrusion in the Mid-Atlantic Ridge, DSDP Leg 37 / Geological Society, London, Special Publications, 60:241-250, doi:10.1144/GSL.SP.1992.060.01.15 --- Simon Allerton and F. J. Vine: Deformation styles adjacent to transform faults: evidence from the Troodos ophiolite, Cyprus / Geological Society, London, Special Publications, 60:251-261, doi:10.1144/GSL.SP.1992.060.01.16 --- T. S. Brewer, R. Pelling, M. A. Lovell, and P. K. Harvey: The validity of whole-rock geochemistry in the study of the oceanic crust: a case study from ODP Hole 504B. / Geological Society, London, Special Publications, 60:263-276, doi:10.1144/GSL.SP.1992.060.01.17 --- Andrea Borgia and Benedetta Treves: Volcanic plates overriding the ocean crust: structure and dynamics of Hawaiian volcanoes / Geological Society, London, Special Publications, 60:277-299, doi:10.1144/GSL.SP.1992.060.01.18 --- R. A. Harris: Peri-collisional extension and the formation of Oman-type ophiolites in the Banda arc and Brooks Range / Geological Society, London, Special Publications, 60:301-325, doi:10.1144/GSL.SP.1992.060.01.19
    Pages: Online-Ressource (V, 330 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317699
    URL: http://sp.lyellcollection.org/content/60/1
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Probing dynamics in the Franck–Condon and exit channel regions of dissociating H2S: Emission spectra upon tunable excitation from 199–203 nm (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5652-5664 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This study uses emission spectroscopy of H2S at excitation energies near 200 nm to probe the dissociation dynamics from a conical intersection in the Franck–Condon region to the H+SH product exit channel. Photoexcitation accesses these coupled surfaces near the transition state region of the lower adiabat, a potential surface for the excited state H+SH→HS+H reaction. Excitation wavelengths from 199–203 nm tune through the first of the resonances in the absorption spectrum assigned to recurrences in the motion along the symmetric stretch orthogonal to the reaction coordinate and also access energies just above and at the conical intersection. We disperse the emission from the dissociating molecules at each of five excitation wavelengths in this region to probe several features of the reaction dynamics on the coupled potential energy surfaces. The resulting emission spectra cover the range of final vibrational eigenstates from 500 to 11 000 cm−1 above the initial ground vibrational state for all five excitation wavelengths, and go out to 16 500 cm−1 for the 199 and 201 nm excitation wavelengths. The resulting spectra, when considered in conjunction with recent scattering calculations by Heumann and Schinke on ab initio potential energy surfaces for this system, evidence a progression of emission features to low vibrational eigenstates in the SH stretch that result from coupling of the nuclear motion from the bound to the dissociative region of the potential energy surfaces.This emission, into local mode eigenstates such as 00+1, 11+0, 11+1, 21+0, 21+1, evidences the antisymmetric dissociative motion and bending induced near the conical intersection, and dominates the spectrum at excitation wavelengths only near 200 nm. We analyze the excitation wavelength dependence of these features and also of the n0+0 progression for n≥4, which reflect the exit channel dynamics. The excitation wavelength dependence shows that while the emission spectra do not reveal any dynamics unique to scattering states that access a symmetric stretch resonance in the Franck–Condon region, they do reveal the energy location of and the dynamics at the conical intersection. A reanalysis of other workers' measurements of the SH product vibrational state distribution shows that v=0 products are strongly favored at excitation wavelengths near the conical intersection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467351
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical study of nonlinear forced magnetic reconnection (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 132-138 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two-dimensional numerical simulations are used to investigate nonlinear aspects of forced magnetic reconnection in a zero β highly conducting plasma. This is representative of the solar corona, where reconnection may be induced by external perturbations, e.g., at the photospheric boundary of the corona. The aim is to investigate the energy dissipation by the reconnection, which may provide a mechanism for heating the coronal plasma. The field is taken to be initially a sheared force-free equilibrium in a slab, and the effects of applying a slow deformation to the boundaries are investigated. Previous analytical studies assuming small departures from the initial equilibrium have found that a current sheet forms during an initial ideal phase of evolution, which subsequently relaxes to a reconnected equilibrium, releasing some magnetic energy. The linear theory predicts that the energy release has a singularity when the field is marginally stable to the tearing mode. The nonlinear evolution of the field is calculated numerically, focusing on the energy release. In particular, the strongly nonlinear behavior is studied in the parameter regime in which the linear theory breaks down. It is found that nonlinearities become strong close to the marginal stability point, and for such highly sheared fields, the energy released by reconnection is large even for weak boundary deformations. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329151
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  • 4
    Electronic Resource
    Electronic Resource
    Competing Bond Fission and Molecular Elimination Channels in the Photodissociation of CH3NH2 at 222 nm (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 2635-2645 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100009a022
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  • 5
    Electronic Resource
    Electronic Resource
    Electric-drift generated trajectories and particle acceleration in collisionless magnetic reconnection (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2261-2268 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Adiabatic acceleration of charged particles along magnetic field lines originates from the coupling between the electric drift and longitudinal motion in a nonunidirectional magnetic field. As a result, initially slow particles entering the reconnection site of an X-type magnetic geometry can leave the latter as substantially accelerated jets directed along the magnetic separatrices. The corresponding energy spectrum has a power-law form, with the spectral index depending on the angle between the separatrices. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872555
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  • 6
    Electronic Resource
    Electronic Resource
    Stability studies and the origin of the n=1 mode in the SPHEX spheromak experiment (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4248-4259 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oscillations with toroidal mode number n=1 are ubiquitous in helicity injected spheromaks and spherical tokamaks, and play a crucial role in current drive. It has been proposed that these arise from a current driven instability of the open flux tube. Stability calculations are presented to confirm this, and they are compared with experimental data from the Spheromak Experiment (SPHEX) [M. Rusbridge et al., Plasma Phys. Control. Fusion 39, 683 (1997)]. The equilibria are modelled as piece-wise constant μ profile force-free plasmas with different values for the μ in the open (μc) and closed (μa) flux regions. A stability map in μc,μa space is then calculated. The SPHEX experimental data is also reduced to the same space both as a culmination of direct single point measurements of μ and as a time history of the reconstructed equilibrium from a particular shot. The results show a favorable comparison of the stability map with experiment, both in magnitude and shape. The effect of inserting a central current-carrying rod on the stability is also discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873692
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  • 7
    Electronic Resource
    Electronic Resource
    The Solar Magnetic Field as a Coronal Hole Extension Forms: Effects of Magnetic Helicity and Boundary Conditions (1999)
    Springer
    Space science reviews 87 (1999), S. 145-148 
    Details
    ISSN: 1572-9672
    Keywords: force-free ; corona ; magnetic fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analytical solution is presented for linear force fields within a spherical shell, representing the solar corona. Allowing for a global magnetic helicity, we find magnetic fields over the entire corona with realistic inner boundary conditions obtained from transformation and extrapolation of photospheric magnetograms and considering alternative outer boundary conditions. Such fields are found for the well known coronal hole extension event of August 1996.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005190821498
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  • 8
    Electronic Resource
    Electronic Resource
    Coronal magnetic field equilibrium with discrete flux sources (1995)
    Springer
    Solar physics 161 (1995), S. 289-316 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model of the equilibrium structure of the coronal magnetic field is developed, taking account of the fact that field lines are rooted in the photosphere, where field is concentrated into isolated flux tubes. The field is force-free, described by ∇ ×B =α B, withα constant; this field has special physical significance, being the state of mininum energy after small-scale reconnections, and is also mathematically convenient in that the principle of superposition can be used to construct complex geometries. First a model of a single loop is presented, with a flux source and sink pair at the photosphere; both point flux tubes and finite radius flux tubes are considered. Then more complex topologies with multiple sources and sinks are investigated. It is shown that significant topology changes arise for different values ofα, indicating the possibility that there can be energy changes through magnetic reconnection if the field evolves ideally and then relaxes to a linear state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732072
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  • 9
    Electronic Resource
    Electronic Resource
    The shape of twisted, line-tied coronal loops (1989)
    Springer
    Solar physics 124 (1989), S. 271-288 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetostatic equilibrium of a coronal loop in response to slow twisting of the photospheric footpoints is investigated. A numerical code is used to solve the full non-linear 2-D axisymmetric problem, extending earlier linearised models which assume weak twist and large aspect ratio. It is found that often the core of the loop tends to contract into a region of strong longitudinal field while the outer part expands. It is shown that, away from the photospheric footpoints, the equilibrium is very well approximated by a straight 1-D cylindrical model. This idea is used to develop a simple method for prescribing the footpoint angular displacement and calculating the equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156270
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  • 10
    Electronic Resource
    Electronic Resource
    The shape of buoyant coronal loops in a magnetic field and the eruption of coronal transients and prominences (1986)
    Springer
    Solar physics 106 (1986), S. 335-351 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equilibrium and non-equilibrium properties of a coronal loop embedded in a stratified isothermal atmosphere are investigated. The shape of the loop is determined by a balance between magnetic tension, buoyancy, and external pressure gradients. The footpoints of the loop are anchored in the photosphere; if they are moved too far apart, no equilibrium is possible and the loop erupts upwards. This critical separation is independent of the pressure differential between the loop and the external medium if the loop has enhanced magnetic field, but varies if instead the loop pressure is increased. The maximum width is proportional to the larger of the gravitational scale-height and the length-scale of the ambient field. In some circumstances, it is shown that multiple solutions exist for the tube path. These results may be relevant to the eruption of prominences during the preflare phase of two-ribbon flares and to the onset of coronal loop transients. Such eruptions may occur if the footpoint separation, internal pressure or internal magnetic field are too great.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00158500
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