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  • 1
    Electronic Resource
    Electronic Resource
    Distinguishing between the Solar, the Interplanetary and Geomagnetic Fields (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 897-897 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It follows that different tubes of force are distinguishable by different K values. Smith3 and others used the empirical relation: (where a 106 c/s) to describe the whistler medium of the Earth, where fc is the plasma frequency and fH the gyro-frequency of electrons. This is equivalent to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199897a0
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  • 2
    Electronic Resource
    Electronic Resource
    Joule Heating of the Ionosphere Over Halley Bay (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 444-445 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN earlier communications I reported investigations of joule dissipation in the ionosphere1-3. Some spot estimates of the heating were given previously. It is the purpose of this communication to derive a distribution (with magnetic disturbance) of such heating in the ionosphere over Halley Bay ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199444a0
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  • 3
    Electronic Resource
    Electronic Resource
    Solar Terrestrial Relationships (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 874-874 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recently, Sonett et al.1 reported a rocket survey of the distant geomagnetic field carried out on a magnetically quiet day, October 11, 1958. They reported an inverse cube variation of field-strength out to 13-6 Earth radii, suggesting that at most the proton density in interplanetary space is 102 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186874a0
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  • 4
    Electronic Resource
    Electronic Resource
    Low-Energy Corpuscular Radiation at High Latitudes (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 738-738 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This mechanism involves travelling (electron) electrostatic waves satisfying the dispersion relation: j 3kT where V = phase velocity of the wave; w - angular frequency of the wave; K. = wave number of the wave; n = electron density; e,m = charge, mass of electron: k = Boltzmann's constant; and T ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183738a0
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  • 5
    Electronic Resource
    Electronic Resource
    Atmospheric Blow-up at the Auroral Zone (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 761-761 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Joule heating in the auroral ionosphere is rapid. In the event of no loss of heat by conduction or convection it would cause the scale height at 160 km. altitude to double in a matter of seconds1'2, whereas the electric currents responsible flow for periods of order 0-5 hr. Let us estimate the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194761a0
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  • 6
    Electronic Resource
    Electronic Resource
    Orbital Acceleration of Satellites during Geomagnetic Disturbance (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 42-75 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider a model thermosphere in which the height (z) rate of change of scale height, H (= kT/mg), is constant, that is, dH/dz = p = constant (k - Boltzmann's constant, T = temperature, m = molecular weight of gas, g = acceleration due to gravity). Then3: p/Po = (H/H.)-W (I) where p, p0 are the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194042b0
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  • 7
    Electronic Resource
    Electronic Resource
    A Source of Energy for the Ionosphere (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 75-75 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider first those ionospheric currents causing the quiet solar daily variation (Sq) of the geomagnetic field. Their intensity2 is about 104 amp. per degree of latitude. Assuming they flow in a height range of 50 km. in a quiet ionosphere in which ^(average) ^ 4 x 10~14 E.M.U., Q(Sq) is about ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194075a0
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  • 8
    Electronic Resource
    Electronic Resource
    Hydromagnetics and Stellar Structure (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 31-33 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is generally agreed that the microscopic processes of absorption and emission of electromagnetic radiation play a part in determining the macroscopic structure of gaseous stars. Thus the equation of hydrostatic equilibrium of a spherically symmetrical distribution of matter in radiative ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189031a0
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  • 9
    Electronic Resource
    Electronic Resource
    A Ready Method for finding Eccentric Dipole Time (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 1279-1280 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The point of the present communication is to indicate that eccentric dipole time can be found to a useful accuracy for many purposes by a semi-graphical method. Knowing the universal time, the equation of time and the solar declination, the position of the sub-solar point can be found on a map ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1991279a0
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  • 10
    Electronic Resource
    Electronic Resource
    Solutions of the heat conduction equation in multilayers for photothermal deflection experiments (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1362-1373 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Exact expressions are presented for the deflection of a laser beam passing parallel to and above the surface of a sample heated by a periodically modulated axisymmetric laser beam. The sample may consist of any number of planar films on a thick substrate. These exact expressions are derived from a local Green's function treatment of the heat conduction equation, and contain an exact analytical treatment of the absorption of energy in the multilayered system from the heating laser. The method is based on calculation of the normal component of the heat fluxes across the layer boundaries, from which either the beam deflections or the temperature anywhere in space can be easily found. A central part of the calculation is a tridiagonal matrix equation for the N+1 normal boundary fluxes, where N equals the number of films in the sample, with the beam deflections given as simple functions of the normal heat flux through the top surface of the sample. Even though any layer or layers in the sample (including the substrate) can be optically absorbing, the final results are remarkably simple both in form and ease of calculation, even for large numbers of layers. In the case of an infinitesimal probe beam, the beam deflections are given by an expression involving a single numerical integration which can be eliminated for data analysis by Fourier transforming the experimental data. A general expression for the measured signals for the case of four-quadrant detection is also presented and compared to previous calculations of detector response for finite probe beams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351747
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