@Article{PugachevaGonJaySchGus:2004:RiCuIo,
               author = "Pugacheva, G. and Gonzalez, W. and Jayanthi, U. and Schuch, Nelson 
                         Jorge and Gusev, A.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Ring Current Ion Finite Motion in Disturbed Magnetosphere With 
                         Nonequipotential Magnetic Field Lines",
              journal = "Advances in Space Research",
                 year = "2004",
               volume = "33",
               number = "5",
                pages = "723--728",
             abstract = "Simulations of the transport of ring current particles in the 
                         magnetosphere during disturbances are attempted using a 
                         three-dimensional single particle code. The simulations 
                         considered, for the magnetospheric field both the dipole and 
                         Tsyganenko models. The convection electric field is described in 
                         equatorial plane by the model of Volland-Stern with dependence on 
                         geomagnetic activity and is assumed to be the same out of the 
                         equatorial plane. It implies nonequipotentiality of the 
                         geomagnetic field lines that is possible for L > 6 in disturbed 
                         magnetosphere conditions. The energetic protons of several tens of 
                         keV start on the night side at L=4 and have motion confined to the 
                         equatorial plane mostly under gradient magnetospheric drift. 
                         However, soon after crossing the noon-night meridian, at some 
                         point in their ExB transport trajectory, the protons are observed 
                         to abruptly depart from the equatorial plane and move towards high 
                         latitude regions. This latter motion is essentially confined to a 
                         plane perpendicular to the equator and is characterized by finite 
                         periodic motion. The calculations further indicated sudden 
                         violation of the first adiabatic invariant at the point of 
                         departure from the equatorial region, with slow variation latter 
                         along the orbit. The greater the convection electric field the 
                         higher is the energy of the protons participating in this off 
                         equatorial flow. These numerical calculations indicated that this 
                         perpendicular flow can significantly contribute to the 
                         morning-evening component of the magnetic field perturbation at 
                         storm time, populating the high latitude region by protons with 
                         energy around tens of keV. The more energetic ions, however, 
                         continue their magnetic drift around the Earth uninterruptedly and 
                         form the symmetric ring current population.",
           copyholder = "SID/SCD",
                 issn = "0273-1177",
             language = "en",
           targetfile = "science.pdf",
        urlaccessdate = "17 maio 2024"
}