منابع مشابه
Ionospheric Electron Density Perturbations Driven by Seismic Tsunami-Excited Gravity Waves: Effect of Dynamo Electric Field
The effect of an ionospheric dynamo electric field on the electron density and total electron content (TEC) perturbations in the F layer (150–600 km altitudes) is investigated at two arbitrarily selected locations (noted as 29◦ N and 60◦ N in latitudes) in the presence of seismic tsunami-excited gravity waves propagating in a stratified, nondissipative atmosphere where vertical gradients of atm...
متن کاملApplications of ripple correlation control of electric machinery - Electric Machines and Drives Conference, 2003. IEMDC'03. IEEE International
Abshacr Ripple correlation control can be applied to electric dr*e system in order to optimize some cost function independent of parameters. Tbis involves correlating the perturbations in the cost function with the perturbations in the independent variable to obtaim a command for the independent variable. The perturbations are normally due to ripple that is naturally prewnt in electric drive sy...
متن کاملDynamo Mechanisms
Dynamo theory is reviewed with particular emphasis on recent developments. There now seems to be a strong case for dynamo eeects that are driven by the magnetic eld itself. This is linked to recent interpretations of the observed stellar cycle periods which suggest that the ratio of cycle frequency to rotational frequency increases, up to some point, with stellar chromospheric activity. This ra...
متن کاملAccretion-disk dynamo models with dynamo-induced alpha-effect
A nonlinear 1D dynamo model with a heuristic -ansatz for magnetic field-induced turbulence is considered growing for weak fields and suppressed by strong fields. The amplification of initial magnetic fields is regarded in accretion disks like both Kepler disks and galaxies. The solutions for the magnetic field are symmetric with respect to the equator, they are steady for positive -effect and o...
متن کاملA growing dynamo from a saturated Roberts flow dynamo
Using direct simulations, weakly nonlinear theory and nonlinear mean-field theory, it is shown that the quenched velocity field of a saturated nonlinear dynamo can itself act as a kinematic dynamo. The flow is driven by a forcing function that would produce a Roberts flow in the absence of a magnetic field. This result confirms an analogous finding by F. Cattaneo & S. M. Tobias (arXiv:0809.1801...
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ژورنال
عنوان ژورنال: Science
سال: 1901
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.14.350.410