Predicting the electron population of Earth’s ring current during geomagnetic storms still remains a challenging task. In this work, we investigate sensitivity 10 keV electrons to different driving processes, parameterised by Kp index, several moderate and intense storms. Results are validated against measurements from Van Allen Probes satellites. Perturbing index allows us identify most domina...

The persistent spin current in an anisotropic spin ring penetrated by a SU(2) flux is studied by the Schwinger–Boson mean-field approach. The anisotropy in spin coupling can facilitate the persistent spin current. Ground-state energy and excitation-energy gap are also studied. A peak of spin current occurs at the maximum value of the ground-state energy. r 2006 Published by Elsevier B.V. PACS: ...

We describe a ”train” effect which may exist in small metallic and semiconductor rings and might be associated with the long-standing problem of the persistent current enhancement. The current is associated with the cooperative motion of N electrons constituing the N -electron ”train”. The train arises via an excitation or a backflow of spin waves or of interchannel charge density sound modes. ...