排序方式： 共有6条查询结果，搜索用时 15 毫秒
1
1.
The results of field observations on exogenic morphogenesis in the upper reaches of the Cherek Balkarskii River (Kabardino-Balkaria) are presented. It is established that different components of the extreme morphogenetic process confined to the distribution area of unconsolidated Quaternary sediments are closely interrelated to form a peculiar geomorphological mechanism. 相似文献
2.
Mishin V. M. Saifudinova T. I. Karavaev Yu. A. Kurikalova M. A. Bazarzhapov A. D. 《Geomagnetism and Aeronomy》2009,49(7):975-982
The regular appearance of the chain of oppositely directed field-aligned current (FAC) pairs near the noon-midnight meridian
during three considered substorms has been described. The FAC pairs (FACs flowing into the ionosphere in the morning and flowing
out of this region in the evening and vice versa) are observed in each of three Iijima and Potemra zones. The FAC direction
in the fixed LT sector periodically varies along the chain. The scenario, according to which each FAC pair (seven pairs) is
identified with a hump or trough of one of the waves propagating from the Earth and toward the Earth in different magnetospheric
domains, has been described. The estimated wave velocities differ from ∼100 to >1000 km/s depending on the propagation region
but everywhere agree with the corresponding velocities of magnetosound waves (MSWs). The hypothesis is proposed, according
to which these MSWs are excited by plasma ejection during current disruption and reconnection near the dayside magnetopause
and in the near/middle regions of the nightside tail. 相似文献
3.
V. M. Mishin M. Foerster T. I. Saifudinova A. D. Bazarzhapov Yu. A. Karavaev L. A. Sapronova S. I. Solovyev 《Geomagnetism and Aeronomy》2007,47(4):429-441
The interval 0000-1400 UT of the superstorm of November 20, 2003, has been studies based on the ACE/WIND data and the MIT2 magnetogram inversion technique. The distributions of the electric potential and currents, field-aligned currents, and Joule heat in the ionosphere have been calculated. The variable magnetotail length and powers coming into the magnetosphere, ionosphere and ring current have been estimated. The selected superstorm intervals, when it became possible to identify the disturbance mode produced by the interaction between the variable solar wind dynamic pressure and IMF effects, have been described. Spontaneous substorms, two types of driven responses to changes in IMF or in the solar wind dynamic pressure (P d ), zero events at simultaneous jumps of IMF and P d , and a previously unknown mode of saturation of the ionospheric electric field at a redistribution of the energy coming into the magnetosphere between the ionosphere and ring current are among the selected modes. 相似文献
4.
E.E. Antonova I.M. Myagkova M.V. Stepanova M.O. Riazantseva I.L. Ovchinnikov B.V. Mar’in M.V. Karavaev 《Journal of Atmospheric and Solar》2011,73(11-12):1465-1471
Variations of electron fluxes with energies 300–600 keV in the region of quasitrapping are analyzed using data of the low orbiting Coronas-F satellite. Enhancements in the electron fluxes with energies above 300 keV are observed at the polar boundary of the outer radiation belt. Meteor-3M satellite data, OVATION and AP models of the position of the auroral oval are used to determine the position of analyzed increases in the energetic electrons with respect to the position of the auroral oval. There is a significant number of events when these increases were observed at a few consequent orbits crossing the outer radiation belt boundary. Studied increases in relativistic electron fluxes are localized at the latitudes of the auroral oval. Different mechanisms of formation of observed enhancements are discussed. The possibility of the appearance of increases due to formation of local particle traps is analyzed using Tsyganenko geomagnetic field models. The role of the formation of local particle traps at the boundary of the outer radiation belt and its possible influence to the formation of the outer radiation belt is discussed. 相似文献
5.
Doklady Earth Sciences - Morphometric terrain parameters such as slope angles and altitudes make a considerable contribution to the features of mudflows. In order to assess the contribution of... 相似文献
6.
Karavaev Yu. A. Sapronova L. A. Bazarzhapov A. D. Saifudinova T. I. Kuz’minykh Yu. V. 《Geomagnetism and Aeronomy》2009,49(7):961-969
The magnetospheric storm on November 20, 2003 was one of two greatest events in 1957–2003. The D
st* index reached −472 nT, the polar cap potential drop exceeded 200 kV, the polar cap boundary expanded up to Φ = 60°, the plasma
layer density in the synchronous orbit reached 5 cm−3, and the inner edge of the plasma sheet penetrated up to L ∼ 1.5R
E. The sequence of disturbance modes including some previously unknown is described. The distribution of the total power input
into the magnetosphere between the ionosphere (power Q
i) and the ring current (Q
DR), as well as the relative roles of the spontaneous substorms and the driven disturbances in the creation of the DR current, is analyzed. The values of the parameter α = Q
DR/Q
i are calculated with a step of 5 min. It is shown that intervals with α ≪ 1 and with maximums α ≫ 1 were observed in the events
under consideration. These results contradict the dominant opinion that the energy input into the magnetosphere during disturbances
is primarily dissipated in the ionosphere. The two types of α maximums are observed: one in the mode of a prevailing spontaneous
substorm and the other in the mixed mode of the substorm and driven disturbance. It is concluded that both types of the maximums
and corresponding enhancements of the DR current appeared due to the plasma turbulization processes in the substorm current
wedge. The parameter α appears to slowly increase from α ≪ 1 to α > 1 with increasing activity level; this trend supports
the driven model of creating the DR current due to an increase in the electric field of the solar wind. 相似文献
1