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  • Other Sources  (5)
  • SOLAR PHYSICS  (5)
  • 2015-2019
  • 1975-1979  (5)
  • 1
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    Stochastic acceleration of solar flare protons (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The acceleration of solar flare protons by the cyclotron damping of intense Alfven wave turbulence in a magnetic trap is considered. The energy diffusion coefficient is computed for a near-isotropic distribution of super-Alfvenic protons, and a steady-state solution for the particle spectrum is found for both transit-time and diffusive losses out of the ends of the trap. The acceleration time to a characteristic energy of about 20 MeV per nucleon can be as short as 10 sec. On the basis of phenomenological arguments, it is inferred that the Alfven wave spectrum typically has an inverse square frequency dependence and that the correlation time of the turbulence lies in the range between 0.5 and 50 msec.
    Keywords: SOLAR PHYSICS
    Type: AD-A081336 , Astrophysical Journal; vol. 233
    Format: text
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  • 2
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    Dynamo action in a thin slab (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We consider the dynamo action produced by convection of a partially ionized, electrically conducting gas in a magnetic field. The model consists of two thin, Cartesian unipolar inductors connected in series by the magnetic field. For the case of a uniform magnetic field we compute the total current system generated by an arbitrary gas flow; for the case of a nonuniform field, we compute only the field-aligned coupling current. Application is made to the solar atmosphere.
    Keywords: SOLAR PHYSICS
    Type: AD-A069773 , Astrophysical Journal; vol. 228
    Format: text
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  • 3
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    Stochastic acceleration of solar flare protons (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The acceleration of solar flare protons is considered by cyclotron damping of intense Alfven wave turbulence in a magnetic trap. The energy diffusion coefficient is computed for a near-isotropic distribution of super-Alfvenic protons and a steady-state solution for the particle spectrum is found for both transit-time and diffusive losses out of the ends of the trap. The acceleration time to a characteristic energy approximately 20 Mev/nucl can be as short as 10 sec. On the basis of phenomenological arguments an omega/2 frequency dependence for the Alfven wave spectrum is inferred. The correlation time of the turbulence lies in the range .0005 less than tau/corr less than .05s.
    Keywords: SOLAR PHYSICS
    Type: SU-SUIPR-739
    Format: application/pdf
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  • 4
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    Linear force-free fields in the lower corona (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Boundary conditions are imposed on the normal component of B on two parallel planes which delineate the force-free volume of linear magnetic fields in low coronal levels of the solar atmosphere. Green's function is employed to ensure that equations for the magnetic field energy remain bounded and smooth. Field line tracings of a simple bipolar source distribution are developed and compared with empirical data obtained from visual observations in H(alpha), EUV, and X-rays.
    Keywords: SOLAR PHYSICS
    Type: AD-A079431 , Solar Physics; 56; Jan. 197
    Format: text
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  • 5
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    The exterior source surface for force-free fields (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Consideration is given to the exterior source surface for force-free fields. The spherical harmonic expansion is presented for boundary values on two concentric spheres. An upper limit on a constant which measures the strength of coronal currents is found to be a function of the lowest multipole moment of the prescribed boundary values. The solar atmosphere is in the class of magnetic fields for which the study is applicable.
    Keywords: SOLAR PHYSICS
    Type: AD-A055455 , Astronomy and Astrophysics; 62; 1-2,; Jan. 197
    Format: text
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