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  • 1970-1974  (23)
  • 1
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    Geomagnetic potential in dipole coordinates (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: International geomagnetic reference field 1965 geomagnetic potential rate of change and transformation to dipole coordinates
    Keywords: GEOPHYSICS
    Type: ; YAL SOCIETY (
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    NASA TECHNICAL REPORTS
  • 2
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    A new formulation of canonical perturbation theory (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Canonical perturbation theory formulation applied to Poincare-von Zeipel method
    Keywords: SPACE SCIENCES
    Type: ; 99-102 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Shell splitting due to electric fields. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Drift shells of trapped particles starting from a single field line in the earth's magnetic field may become separated owing to an electric field. By using the formalism of the shell-splitting function, this separation is calculated for an arbitrary curl-free time-independent electric field satisfying E.B = 0, with no limitation on the particle's longitudinal excursion. The effect of nondipole field components is also taken into account to the lowest order.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 76; Nov. 1
    Format: text
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  • 4
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    A study of the electric field in an open magnetospheric model (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Recently, Svalgaard and Heppner reported two separate features of the polar electromagnetic field that correlate with the dawn-dusk component of the interplanetary magnetic field. This work attempts to explain these findings in terms of properties of the open magnetosphere. The topology and qualitative properties of the open magnetosphere are first studied by means of a simple model, consisting of a dipole in a constant field. Many such properties are found to depend on the separation line, a curve connecting neutral points and separating different field line regimes. In the simple model it turns out that the electric field in the central polar cap tends to point from dawn to dusk for a wide variety of external fields, but, near the boundary of the polar cap, electric equipotentials are deformed into crescents.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Nov. 1
    Format: text
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  • 5
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    Euler potentials (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Products of gradients of scalars in plasma physics structure representation, discussing cross products of gradients of scalars in plasma physics
    Keywords: PHYSICS, GENERAL
    Type: ; UGREVUE(
    Format: text
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  • 6
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    An inverse theorem about the magnetic field line velocity. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It is shown that every field line velocity is associated with a set of Euler potentials (alpha prime, beta prime) such that particles moving with this velocity observe constant values of alpha prime and beta prime. The field line and flux preservation properties of the motion follow immediately, and a short independent proof of the Helmholtz-Zorawski criterion for field line preservation is also given. Arguments are given to show that in general it is not possible to single out one 'basic' field line velocity when only the time dependent magnetic field configuration is given.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Apr. 1
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  • 7
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    Classical adiabatic perturbation theory (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Classical Poincare-von Zeipel canonical perturbation theory extension to adiabatically perturbed systems with slow dependence on time or dynamic variables
    Keywords: PHYSICS, GENERAL
    Type: ; 420-429. (
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  • 8
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    The canonization of nice variables (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Kruskal transformation canonization of perturbed periodic systems with Hamiltonian
    Keywords: MATHEMATICS
    Type: ; 420-429. (
    Format: text
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  • 9
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    Hamiltonian formulation of guiding center motion (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The nonrelativistic guiding center motion of a charged particle in a static magnetic field is derived using the Hamiltonian formalism. By repeated application of first-order canonical perturbation theory, the first two adiabatic invariants and their averaged Hamiltonians are obtained, including the first-order correction terms. Other features of guiding center theory are also given, including lowest order drifts and the flux invariant.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-65700 , X-641-71-373 , NASA-TM-X-65458 , X-641-71-56
    Format: application/pdf
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  • 10
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    Unipolar induction in the magnetosphere (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A theory is described for the production of electric currents in the magnetosphere and for the transfer of energy from the solar wind to the magnetosphere. Assuming that the magnetosheath has ohmic-type conduction properties, it is shown that unipolar induction can energize several current flows, explaining the correlation of the east-west component of the interplanetary magnetic field with polar electric fields and polar magnetic variations. In the tail region, unipolar induction can account for effects correlated with the north-south component of the interplanetary magnetic field.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-65893 , X-641-72-133
    Format: application/pdf
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