排序方式： 共有19条查询结果，搜索用时 265 毫秒
11.
Yu. I. Denisov V. V. Kalegaev I. N. Myagkova M. I. Panasyuk 《Solar System Research》2011,45(3):206-211
This paper describes the design and principles of operation of the Electron-M-PESCA instrument, provides a specification of
the information system to store and access the measurement results registered with Electron-M-PESCA, and evaluates the prospects
of applying this system to assess the radiation conditions in the near-Earth space. It presents an analysis of the increase
in relativistic electron flows with energies of 1–4 MeV registered in Earth’s outer radiation belt in the middle of March
2009 after weak magnetic disturbances caused by the approach of a high-speed solar wind flow as an example of on-line analysis
of research information obtained with Electron-M-PESCA. 相似文献
12.
V. V. Kalegaev 《Geomagnetism and Aeronomy》2011,51(7):855-865
A review of modern dynamic models of the Earth’s magnetosphere (the A2000 paraboloid model and Tsyganenko’s T01 model) is
presented. For the magnetic storm of January 9–11, 1997, the results of joint calculations of the magnetospheric magnetic
field are presented and contributions of the large-scale magnetospheric currents to the D
st variations are analyzed. Both models were shown to be well consistent with measurement data; the contribution of the magnetotail
current system to D
st is comparable to the contribution of the ring current. At the same time, the relative dynamics of magnetospheric current
systems are different in different models. The differences in the magnetic field variation profiles for various current systems
calculated by the A2000 and T01 models are explained by model parameterizations. 相似文献
13.
E. S. Belenkaya D. A. Parunakian I. I. Alekseev V. V. Kalegaev M. S. Blokhina M. S. Grigoryan 《Geomagnetism and Aeronomy》2014,54(4):445-448
In view of the actual question regarding the effect of a solar-wind pressure jump on disturbances in the Earth’s magnetosphere, events with high velocity and density gradients are of special interest. In this work, we consider the response of the current at the dayside magnetopause to these events and the corresponding strengthening of the geomagnetic field in the low-latitude magnetosphere. A transient process is studied that accompanies reconfiguration of the magnetosphere under the effect of disturbances of solar wind parameters. An analytical equation is received for estimation of an increase in the northern component of low-latitude magnetic field of the magnetosphere in a transient current system (transient ring current) versus initial values of the solar-wind velocity and density and their disturbances. 相似文献
14.
Myagkova I. N. Shugai Yu. S. Kalegaev V. V. Kolmogorova V. A. Dolenko S. A. 《Geomagnetism and Aeronomy》2020,60(3):279-288
Geomagnetism and Aeronomy - The paper proposes a model for predicting the integral daily fluxes (fluences) of relativistic electrons (RE) (E > 2 MeV) of the Earth's outer radiation belt... 相似文献
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Sharp changes of the solar wind parameters determining the dynamic pressure jump lead to strong magnetosphere-ionosphere disturbances. Here the effect on the Earth’s ionospheric high latitudes of the solar wind dynamic pressure pulse caused only by the increase of the interplanetary plasma density under southward constant IMF is considered. We investigate reaction of the cross-polar cap potential on the increase of AL index and/or jump of the solar wind density. It is found that for the case of 10 January 1997 the main contribution to the polar cap potential drop increase gave the growth of AL index relative to the input of the solar wind density jump. We also study the influence of the solar wind density increase on the crosspolar cap potential for the quiet magnetospheric conditions. It occurred that the polar cap potential difference decreases with the great increase of the interplanetary plasma density. For the disturbed magnetosphere the main role in the polar cap potential drop increase plays increase of AL. Thus, we found the change of the cross-polar cap potential due to the AL index variations and/or the solar wind density drop even in a case when the interplanetary electric field is constant. 相似文献
17.
The well-studied event of January 10, 1997, was used to study the mechanism responsible for the response of the auroral ionosphere to the solar-wind dynamic pressure jump given a southward interplanetary magnetic field. All solar-wind parameters of this event were constant except for the jump in plasma density (duration 22 min). Immediately after arrival and during the pressure jump, the inner boundary of the auroral oval moved poleward, whereas the position of the outer boundary was stable. The amplification of the magnetopause current caused by an increase in the solar-wind plasma density was calculated. We think that the amplified magnetopause current is closed by the polarization current at the front of the disturbed region in the magnetosphere, thus forming the “transient ring current” that exists during the pressure jump. We determined the northward magnetic field of this “temporary ring current,” the order of magnitude of which coincided with that of the field responsible for the observed poleward shift of the high-latitude boundary of the auroral oval. 相似文献
18.
Comparison of Earth’s magnetospheric magnetic field models in the context of cosmic ray physics 总被引：1，自引：0，他引：1
Laurent Desorgher Karel Kudela Erwin O. Flückiger Rolf Bütikofer Marisa Storini Vladimir Kalegaev 《Acta Geophysica》2009,57(1):75-87
Over the last two decades, models of the Earth’s magnetospheric magnetic field have been continuously improved to describe
more precisely the different magnetospheric current systems (magnetopause current, symmetric and partial ring currents, tail
currents and field aligned currents). In this paper we compare the different Tsyganenko models and the Alexeev and Feldstein
model in the context of cosmic ray physics. We compare the vertical cutoff rigidity and asymptotic direction of vertical incidence
obtained with these models for the January 20, 2005, ground level enhancement and for the big magnetic storm of April 6, 2000.
For the event of January 20, 2005, we study the impact of the differences in asymptotic direction obtained with the models
on the radiation dose computation at aircraft altitude. For the magnetic storm of April 6, 2000, we discuss the importance
of the different magnetospheric current systems in causing cutoff rigidity variations. Finally we summarise the advantages
and drawbacks of the different models in the context of space weather. 相似文献
19.
Geomagnetism and Aeronomy - The paper presents the results of a comparative analysis of the dynamics of relativistic electron fluxes of the Earth’s outer radiation belt and correspondent ring... 相似文献