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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear low frequency electromagnetic waves in a relativistic electron-positron plasma (1996)
    Springer
    Astrophysics and space science 243 (1996), S. 427-437 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using an exact solution of Maxwell's equations and the relativistic equations of motion for electrons and positrons we demonstrate the existence of an electromagnetic wave with a frequency considerably lower that the electron cyclotron frequency. For such a wave the cutoff frequency is determined by the Langmuir frequency and by the wave amplitude. For realistic pulsar parameters a remarkable reduction in the cutoff frequency is then controlled by nonlinear relativistic effects. Modulation instability of this wave is also investigated both analytically and numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644712
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  • 2
    Electronic Resource
    Electronic Resource
    Solar flare activity and the structure of the coronal neutral line (1995)
    Springer
    Solar physics 160 (1995), S. 331-341 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this study we analyse the positions of major flares from 1978 and 1979, with respect to the magnetic structure of the solar corona, as described by a potential field model. We find that major flares exhibit no strong association with the neutral line at the chromospheric level. However, when we calculate the neutral line's position at higher and higher altitudes in the corona, we find that major flares show an increasing tendency to be found close to these high-altitude coronal neutral lines. The correlation between flares and higher-altitude coronal neutral lines reaches a maximum at an altitude of 0.35R ⊙, and thereafter decreases as the neutral line is moved out to the source surface at an altitude of 1.50R ⊙. This indicates that major flares are strongly associated with coronal structure at the 0.35R ⊙ level (≈ 250 000 km) - an altitude surprisingly high in the corona. This reinforces the idea that flares are associated with large-scale coronal magnetic fields and also indicates that the region of coronal magnetic topology important to solar flare processes may be larger than previously thought.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732811
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  • 3
    Electronic Resource
    Electronic Resource
    The Varying Multipolar Structure of the Sun's Magnetic Field and the Evolution of the Solar Magnetosphere Through the Solar Cycle (1998)
    Springer
    Solar physics 179 (1998), S. 223-235 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Sun's magnetic field extends far from the photosphere, into the corona, defining a magnetically dominated region before being drawn out radially by the solar wind flow. This region, where the internal sources of the solar field dominate the plasma structures and the energetic particle movement, can be properly considered the solar magnetosphere. The magnetic field in this region can be approximately described by models that extrapolate photospheric magnetic field observations under some simplifying assumptions. In this paper we use a potential field model which describes the solar field up to a source surface at 3.25 Rs, where the field is constrained to become radial. We present the variation of the magnitude and inclination of the various multipolar components throughout the solar magnetic cycle that characterise the changes in the structure of the solar magnetosphere over a period of 22 years. We also present some 3-D images of the coronal magnetic structure to show the global evolution of the solar magnetosphere throughout the solar cycle and discuss the importance of taking this structure into account in order to relate interplanetary and solar features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005017329287
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  • 4
    Electronic Resource
    Electronic Resource
    THE CORRELATION BETWEEN SUNSPOT AND CORONAL HOLE CYCLES AND A FORECAST OF THE MAXIMUM OF SUNSPOT CYCLE 23 (1997)
    Springer
    Solar physics 173 (1997), S. 193-198 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have shown in previous papers that a close relationship exists between the evolution of polar coronal hole area, estimated from K-coronameter observations, and the Wolf sunspot number, with a time lag of about half a solar cycle. In this paper we study the same relationship, but with the total coronal hole area at the base of the corona as obtained from a potential field model of the coronal magnetic field, which provides a more complete series of about three solar cycles. We confirm the relationship for the two last cycles and find that the forward time shift in the coronal hole area for the best correlation with sunspot number is almost the same for cycles 21 and 22, and this shift is also the time between peaks in both series. We use this result to make an early prediction of the time and size of the sunspot maximum for solar cycle 23, and find that this should occur early in 2001 and have a magnitude of about 190, similar to that of the two previous sunspot cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004916427722
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  • 5
    Electronic Resource
    Electronic Resource
    Heat capacities of submonolayer He3 and He4 adsorbed on Ar-plated copper (1970)
    Springer
    Journal of low temperature physics 3 (1970), S. 281-281 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628152
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  • 6
    Electronic Resource
    Electronic Resource
    Heat capacities of Ar, Ne,4He-Ar, and4He-Ne films adsorbed on Cu at low temperatures (1971)
    Springer
    Journal of low temperature physics 5 (1971), S. 1-16 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Heat capacities of Ar and Ne monolayers adsorbed on Cu are measurable at 1–4 K. Temperature dependences are similar to the low-temperature law for harmonic oscillators, but the empirical characteristic temperatures of 11–15 K are much lower than can correspond to independent adatoms oscillating in substrate sites. The magnitudes and temperature dependences do not match those predicted for surface modes of an absorbent coated with inert impurities or for the collective modes of epitaxial films. A model involving the excitations in non-epitaxial films appears to offer an explanation of the observed magnitudes and temperature dependences. The heat capacities of4He adsorbed on preplated Ar or Ne show little variation with the number of Ar layers, or between Ar and Ne coatings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628225
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical solutions for single passage NMR on nuclei experiencing small electric quadrupole interactions (1977)
    Springer
    Hyperfine interactions 5 (1977), S. 95-108 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The adiabatic rapid-passage NMR equations are numerically solved for a small additional quadrupole interaction. The full range of the ratio of rf interaction strengths to quadrupole interactions strengths is considered for any electric field gradient orientation. The results forI=1 are particularly easy to describe and are used to predict the single-passage results for different orientations of the electric field gradient with respect to the static magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021681
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  • 8
    Electronic Resource
    Electronic Resource
    Quadrupole interaction at169Tm in orthorhombic TmF3 (1990)
    Springer
    Hyperfine interactions 53 (1990), S. 413-418 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quadrupole interaction data recorded by Triplett et al for the C1hTm site in TmF3 are analysed via semi-empirical procedures, one of which employs rank 2 CF parameters derived from the155Gd: GdF3 Mössbauer results of Katila et al. The fitted crystal field interactions are compared with available optical spectroscopy results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101076
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  • 9
    Electronic Resource
    Electronic Resource
    Single passage NMRON and the spin-temperature question (1990)
    Springer
    Hyperfine interactions 60 (1990), S. 933-936 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The analysis of spin-lattice relaxation (SLR) of very dilute impurity nuclei in ferromagnetic hosts, as encountered in NMR of oriented nuclei (NMRON), usually neglects the spin-spin interaction, assuming a no-spin-temperature model. However, the regime of impurity systems for which this assumption is valid has not been established. the relaxation following single passage in60CoFe〈110〉 and55CoFe〈100〉 has been measured, and is compared with calculations made with and without a spin-temperature constraint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399904
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  • 10
    Electronic Resource
    Electronic Resource
    Discrepancies in NMRON Knight Shifts of impurity nuclei in ferromagnets (1992)
    Springer
    Hyperfine interactions 75 (1992), S. 283-290 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Precision NMRON field shift studies have been carried out up to 8T on a54MnNi single crystal along a hard [100] direction and on a125SbFe single crystal along a hard [110] direction. For both systems, high field (B app〉-1T) and low field (0.3T〈B app〈0.8T) data sets are obtained. The analysis reveals a significant discrepancy between the apparent Knight Shift dependent on whether the low field or high field data set is utilised. For both systems, consideration of the high field data sets yield a zero Knight Shift K(54MnNi)=+0.0(0.2)% and K(125SbFe)=+0.2(1.4)%, whereas the low field data sets yield K(54MnNi)=+7.5(3.9)% and K(125SbFe)=−5.4(3.3)% respectively. The field range dependence of K suggests that only Knight shifts measured in large fields (〉-1T) are meaningful for establishing systematics. This casts some doubt on the greater bulk of the literature’s NMRON Knight shift studies, where predominantly low fields have been used to determine K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02398984
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