排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
Dynamical simulations have been developed at IASB-BIRA to model the deformations of the plasmasphere during geomagnetic substorms
and other variations in the level of geomagnetic activity. The simulations are based on the mechanism of plasma instability
and use the empirical Kp-dependent electric field E5D. The results of the simulations are compared with IMAGE observations
that provide the first global comprehensive images of the Earth’s plasmasphere. The predicted plasmapause positions correspond
generally rather satisfactorily with the EUV observations. The plasmasphere is rather extended in all MLT sectors during quiet
periods. During or just after geomagnetic substorms, the plasmaspause is sharper and becomes closer to the Earth in the night
sector. Periods of enhanced geomagnetic activity are associated to the formation of plumes that rotate with the plasmasphere.
The simulations reproduce the formation and the motion of these plumes, as well as the development of other structures like
shoulders observed at the plasmapause by EUV on IMAGE. 相似文献
2.
I.B. Ievenko S.G. ParnikovV.N. Alexeyev 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(8):1252-1260
Investigation results of a diffuse aurora (DA) and stable auroral red (SAR) arc dynamics based on spectrophotometric observations at the Yakutsk meridian (199°E geomagnetic longitude) are presented. The relationship of an equatorward extension of DA in the 557.7 nm emission to a substorm growth phase during the magnetospheric convection intensification after the turn of IMF BZ to the south is shown. The formation of SAR arc during the substorm expansion phase is investigated. The association of SAR arc dynamics with the development of asymmetric ring current (substorm injection) during the main phase of a storm is analyzed. It is shown how the pulsating precipitations of energetic ring current particles develop in the outer plasmasphere based on photometric observations. 相似文献
3.
J. Goldstein 《Space Science Reviews》2006,124(1-4):203-216
The plasmasphere is the cold, dense innermost region of the magnetosphere that is populated by upflow of ionospheric plasma
along geomagnetic field lines. Driven directly by dayside magnetopause reconnection, enhanced sunward convection erodes the
outer layers of the plasmasphere. Erosion causes the plasmasphere outer boundary, the plasmapause, to move inward on the nightside
and outward on the dayside to form plumes of dense plasma extending sunward into the outer magnetosphere. Coupling between
the inner magnetosphere and ionosphere can significantly modify the convection field, either enhancing sunward flows near
dusk or shielding them on the night side. The plasmaspheric configuration plays a crucial role in the inner magnetosphere;
wave-particle interactions inside the plasmasphere can cause scattering and loss of warmer space plasmas such as the ring
current and radiation belts. 相似文献
1