Variability of the ring current source population
Variability of the ring current source population
复制标题
环电流源群体的变化
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. R. Collier
中科院分区：
文献类型：
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作者：
M. F. Thomsen;J. Borovsky;D. McComas;M. R. Collier
对DST*(磁层顶电流修正后的最小DST)范围为-50~-164 nT的23个风暴，研究了风暴时环电流强度与假定源区等离子体片可用密度之间的关系。在地球同步轨道上的等离子体片密度与最小DST*之间有很好的相关性。最小DST*与Wind航天器在上游测得的行星际电场有很好的相关性，这与前人的研究一致，但DST*对等离子体片密度的依赖与其对电场的依赖无关。最小DST*与等离子体片密度和行星际电场的乘积之间的相关性最好。这些结果与风暴时环电流的强度由源强度(等离子体片密度)和注入强度(行星际电场)相结合的情况一致。
The relationship between the strength of the storm‐time ring current and the available density in the presumed source region, the plasma sheet, is examined for 23 storms with Dst* (minimum Dst corrected for magnetopause currents) ranging from ‐50 to ‐164 nT. A good correlation is found between the plasma‐sheet density at geosynchronous orbit and the minimum Dst*. The minimum Dst* is also well correlated with the eastward interplanetary electric field measured upstream by the Wind spacecraft, in agreement with previous studies, but the dependence of Dst* on plasma‐sheet density is unrelated to its dependence on the electric field. The best correlation is between the minimum Dst* and the product of the plasma‐sheet density and the eastward interplanetary electric field. These results are consistent with a scenario in which the intensity of the storm‐time ring current is determined by a combination of source strength (plasma‐sheet density) and injection strength (interplanetary electric field).