Transverse Electric Current Research Articles

Collective interaction-driven ratchet for transporting flux quanta.

We propose and study a novel way to produce a dc transport of vortices when applying an ac electrical current to a sample. Specifically, we study superconductors with a graduated random pinning density, which transports interacting vortices as a ratchet system. We show that a ratchet effect appears as a consequence of the long range interactions between the vortices. The pinned vortices create an asymmetric periodic flux density profile, which results in an asymmetric effective potential for the unpinned interstitial vortices. The latter exhibit a net longitudinal rectification under an applied transverse ac electric current.

Enhanced transmission of laser light through thin slabs of overdense plasmas

Enhanced transmission of electromagnetic radiation through overdense, hot, unmagnetized plasmas has been observed via particle in cell (PIC) simulations. This effect is explained in terms of a fraction of the thermal electrons oscillating in the electrostatic potential of the plasma slab ions at a frequency close to the laser frequency. These electrons are capable of resonantly transporting transverse electric currents across the plasma. As these electrons reach the far end of the slab, the currents cause electromagnetic radiation at the laser frequency to be given off.

A three-dimensional magnetohydrodynamic formalism for coronal helmet streamers

A three-dimensional magnetohydrodynamic (MHD) formulation of the steady state coronal helmet-streamer problem is presented. It includes the simple azimuthally symmetric (∂/∂ Φ =0) and two-dimensional (∂/∂Φ=0, B Φ =0) cases. The major mathematical difficulty-the correct, iterative calculation of the transverse electrical currents, which are the sources of the fields in Maxwell's equations-is eliminated

Changes with Height of Longitudinal Magnetic Field in Active Regions

Results of a study of longitudinal magnetic fields in active regions are presented. The observed magnetic field strength increases with height in the photosphere. The maximum of the magnetic field intensity coincides with the level where the central parts of λ5324,2 Å FeI and λ5269,5 FeI line profiles are formed. On the Hβ formation level the observed magnetic field intensity is smaller as compared with the potential one calculated on the basis of the observed field in FeI λ5253, 5Å line. The difference between the observed magnetic field and potential one is explained in terms of transverse electric currents. The current value can mount to 3×1011 A.