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  • 1
    Electronic Resource
    Electronic Resource
    Millimeter wave scattering off a whistler and lower hybrid waves in a tokamak (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 760-765 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Obliquely propagating whistler and lower hybrid waves through a plasma cause density perturbations. A high-frequency electromagnetic wave sent into such a perturbed region suffers scattering. Theory of electromagnetic wave scattering has been developed in a tokamak where the density profile is taken as parabolic. The wave equation has been solved to evaluate the expression for the amplitude of a scattered wave. For typical parameters of the Princeton Large Torus (PLT) [Bernabei et al., Bull. Am. Phys. Soc. 26, 975 (1981)], the ratio of the power of the scattered to the incident electromagnetic wave comes out to be of the order of 10−4 and 10−5 in cases of scattering off whistler and off lower hybrid waves, respectively, which can be detected; the method can, hence, be used for the diagnostics of the waves. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871428
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "Linear and nonlinear dust-acoustic waves in inhomogeneous dusty plasmas" [Phys. Plasmas 5, 94 (1998)] (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2821-2821 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872974
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  • 3
    Electronic Resource
    Electronic Resource
    Parametric excitation of a lower-hybrid drift wave in the ionosphere (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4617-4620 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parametric excitation of a lower-hybrid drift (LHD) wave has been studied in the ionosphere due to the propagation of a high-frequency electromagnetic (EM) pump wave (with wave number k0≈0) in the presence of the electron collisions. It is considered to be a four wave interaction process of LHD, electromagnetic pump wave, and two electron plasma waves as sidebands. Nonlinear growth rate of a LHD wave is found to be higher for 1〈krLe〈1.5 as compared to the case krLe〈1, where k and rLe, respectively, are the wave number of the LHD wave and electron Larmor radius. Wavelengths of the excited lower-hybrid drift waves lie in the range of the various irregularities observed by Jicamarca [Farley et al., J. Geophys. Res. 75, 7199 (1970)], and Altair and Tradex radars [R. T. Tsunoda, Geophys. Res. Lett. 7, 848 (1980)]. It is seen that the nonlinear growth rate drops significantly in the presence of the electron collisions. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870951
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of dust charge inhomogeneity on linear and nonlinear dust–acoustic wave propagation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3157-3162 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Propagation of linear as well as nonlinear dust–acoustic waves (DAWs) in an inhomogeneous dusty plasma consisting of electrons, ions, and dust particles is investigated by taking into account equilibrium dust charge inhomogeneity along with the density inhomogeneity of the plasma and dust particles. For the linear case with harmonic perturbations, coupled equations for self-consistently determining the wave amplitude and the wave number have been derived. On the other hand, nonlinear DAWs are shown to be governed by a Korteweg–de Vries (KdV) type of evolution equation having variable coefficients arising due to charge and density inhomogeneities. Qualitatively, the amplitudes of the linear and nonlinear DAWs are found to decrease (increase) as the waves propagate into regions of increasing (decreasing) dust charge, which is similar to the behavior found in the case with density inhomogeneity alone. Quantitatively, the amplitude of the dust number density perturbation in the linear wave is proportional to qd0−3/2 nd0−1/2 for a cold dusty plasma, while in the nonlinear regime it scales as qd0−1 nd0−1/4. Approximate analytical solutions of the KdV equation have been obtained by making use of a suitable set of coordinate transformations. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873555
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  • 5
    Electronic Resource
    Electronic Resource
    The Kelvin–Helmholtz instability in the presence of dust charge fluctuations (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2477-2479 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Kelvin–Helmholtz instability is examined by considering the dust charge fluctuations in a dusty plasma. Electrons and ions are assumed to be in Boltzmann equilibria and the dust grains to follow the fluid equations with a full adiabatic equation of state. The transverse shear in the flow parallel to the magnetic field is considered. The instability is found to grow for limiting wave numbers for a particular value of shear velocity. The effect of adiabatic dust plasma pressure is to enhance the growth rate of the instability. For dense plasma, growth of the instability is affected by the presence of dust charge fluctuations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872929
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  • 6
    Electronic Resource
    Electronic Resource
    Linear and nonlinear dust-acoustic waves in inhomogeneous dusty plasmas (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 94-99 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of linear, as well as nonlinear, dust-acoustic waves in inhomogeneous dusty plasmas consisting of electrons, ions, and charged dust particles is investigated. It is shown that the amplitude of the dust-acoustic waves is affected by the presence of the dust density inhomogeneity. Amplitudes of the linear and nonlinear dust-acoustic waves decrease (increase) as the waves propagate in the direction of increasing (decreasing) density. The wave amplitude is inversely proportional to the square root of the dust particle's density for the linear dust-acoustic waves. In the nonlinear case, to the lowest order and for the cold dust species, the wave amplitude is found to be directly proportional to nd0−1/4. Various special cases are explicitly considered, and comparison with the corresponding results for the usual two-component electron-ion plasmas is also carried out. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872891
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  • 7
    Electronic Resource
    Electronic Resource
    Parametric coupling of a high-frequency electromagnetic wave to whistler and lower-hybrid waves in the ionosphere (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 386-391 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parametric coupling of a high-frequency electromagnetic wave to an obliquely propagating whistler or lower-hybrid wave and a high-frequency sideband electromagnetic wave have been studied in the ionosphere. The growth rate of the three-wave resonant interaction process decreases with the frequency of the lower-hybrid wave and increases with whistler wave frequency. Growth rate is greater for the whistler wave than the lower-hybrid wave. The electromagnetic wave is scattered at a larger angle in the case of the lower-hybrid wave than the whistler wave. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871864
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  • 8
    Electronic Resource
    Electronic Resource
    Further Studies on the Restoration of Fertility in Triticum durum×T. timopheevi Hybrids (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 104 (1990), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Twenty one F1 hybrids involving three Triticum durum cultivars and eleven forms of T. timopheevi were backcrossed to their respective durum parents. Backcross fertility (BC1 grain set) of these sterile hybrids improved with the rise in temperature at the time of pollination. A mean temperature of less than 20 °C results in poor seed set while higher mean temperatures around 24 °C result in increased seed set. It is suggested that a large number of backcross seeds can be produced by pollinating these hybrids late in the season, i.e., after 20th of March in northern India.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1990.tb00431.x
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  • 9
    Electronic Resource
    Electronic Resource
    The south to north progression of rainfall anomalies across India during the summer monsoon season (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 624-637 
    Details
    ISSN: 1420-9136
    Keywords: Monsoon rainfall ; Extended EOF analysis ; 40-day oscillation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The low frequency spatio-temporal intraseasonal evolution of monsoon rainfall over India is studied by considering the pentad rainfall averages taken over 2.5° wide and 5.0° long blocks lying across the central longitudinal and latitudinal transacts. The time-latitude cross sections show south to north progressions of rainfall anomalies with a recurrence period of about 40 days. The progressions show considerable inter-annual and intra-seasonal variation in frequency, amplitude and rate of progression. The extended empirical orthogonal function analysis shows that the first two most important functions correspond to this northward progression of rain anomalies recurring after an interval of about 40 days. The rate of progression of anomalies is about 0.5° Lat./day. The time-longitude cross sections show the movement of rainfall anomalies towards both directions east and the west, with slight preference towards the east. The importance of these signals in rainfall forecasting is foreseen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877458
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  • 10
    Electronic Resource
    Electronic Resource
    Prediction of 10-day summer monsson rainfall over India (1978)
    Springer
    Meteorology and atmospheric physics 27 (1978), S. 317-331 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Zur Vorhersage zehntägiger Niederschläge für jeden Monsunmonat (Juni bis September) wurden Regressionsgleichungen entwickelt, die für 14 meteorologische Regionen hauptsächlich in West-, Nordwest- und Zentralindien gelten. Als mögliche Prädiktoren wurden fünftägige Mittelwerte der 700 mb-Topographie und deren Anomalien an 104 Netzpunkten zwischen 10° und 45°N, 20° und 145°E, sowie regionale Niederschläge während der vergangenen 24 Stunden ausgesucht. Diese 209 Prädikatoren wurden zunächst durch einen stufenweisen Vorgang und schließlich durch eine geordnete Selektionsmethode nach ihrer Signifikanz sortiert. Verifikation an Hand eines beschränkten Datenmaterials von 12 Fällen zeigte für Juni und September mäßigen Erfolg in der Vorhersage des zehntägigen Niederschlages etlicher Regionen, wobei der Niederschlag in drei Klassen gleicher Wahrscheinlichkeit gruppiert wurde. Die im Laufe dieser Studie entwickelten Regressionsgleichungen sind derzeit noch nicht für den täglichen Gebrauch bestimmt. Weitere Entwicklungsarbeit ist erforderlich, bevor die gesamten Möglichkeiten dieser synoptisch-statistischen Methode ausgeschöpft werden können. Es konnte gezeigt werden, daß die 700 mb-Topographie über dem Arabischen Meer und in der Nähe von Japan signifikante negative bzw. positive Korrelationskoeffizienten mit dem zehntägigen Niederschlag für die meisten der betrachteten Regionen während sämtlicher Monsunmonate liefert. Eine Erklärung dieser Zusammenhänge wird in dieser Abhandlung versucht.
    Notes: Summary Linear regression equations are developed for predicting 10-day rainfall in each monsoon month (June through September) of 14 meteorological subdivisions lying mainly in Western, North-Western and Central India. The potential predictors considered are 5-day mean 700 mb level contour heights and their anomalies at 104 grid points covering an area between 10° to 45°N and 20° to 145°E, and past 24 hour rainfall of the subdivision concerned. The 209 predictors are preliminarily screened by stagewise procedure and finally screened by forward selection procedure. The verification conducted on limited data of 12 cases revealed moderate success in June and September in predicting the 10-day rainfall of some subdivisions in 3 equally probable classes. The equations developed in the study are not suitable for operational use. Further work on this line is necessary before full potential of synoptic-statistical methods is realised. It is found that the contour heights over the Arabian sea and near Japan bear respectively significant negative and positive correlation coefficients with the 10-day rainfall of most of the subdivisions considered in all the months. Explanation of these relationships is attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02247954
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