Magnetospheric flux transport in the Dungey cycle during 2010

Magnetospheric flux transport in the Dungey cycle during 2010
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2010 年邓吉循环中的磁层通量传输

DOI:
10.1002/essoar.10503601.1
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发表时间:
2020
期刊:
--
影响因子:
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通讯作者:
Milan S
Milan S
中科院分区:
--
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--
作者:
Milan S

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我们量化了2010年不同对流状态对磁层通量通量的贡献。为了做到这一点,我们基于太阳风和行星际磁场的观测,地磁指数,以及由活动磁层和行星电动力学响应实验(AMPERE)测量的场向电流,提供了2010年期间对流状态的连续分类。对流状态被定义为:1)安静和2)弱活动,3)亚风暴生长,4)扩展和5)恢复阶段,6)亚风暴驱动阶段(相对稳定的磁层对流发生时),7)恢复湾(当恢复阶段伴随着AL电喷射指数的负偏移时),以及8)多次增强期(连续短周期AL活动发生时的风暴时段)。磁层有46%的时间是安静的,只有很少的对流发生。大部分对流发生在生长阶段和驱动阶段(分别占日侧重联开放磁通量积累的21%和38%)。我们在对流扩展/收缩极帽模型的背景下讨论了这些结果,并描述了一个框架,在这个框架内,可以理解更连续的太阳风-磁层驱动期间的孤立亚暴和扰动。
We quantify the contributions of different convection states to the magnetic flux throughput of the magnetosphere during 2010. To do this we provide a continuous classification of convection state for the duration of 2010 based upon observations of the solar wind and interplanetary magnetic field, geomagnetic indices, and field-aligned currents measured by the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE). Convection states are defined as 1) quiet and 2) weak activity, substorm 3) growth, 4) expansion, and 5) recovery phases, 6) substorm driven phase (when relatively steady magnetospheric convection occurs), 7) recovery bays (when recovery phase is accompanied by a negative excursion of the AL electrojet index), and 8) periods of multiple intensifications (storm-time periods when continuous short-period AL activity occur). The magnetosphere is quiet for 46% of the time, when very little convection takes place. The majority of convection occurs during growth and driven phases (21% and 38%, respectively, of open magnetic flux accumulation by dayside reconnection). We discuss these results in the context of the expanding/contracting polar cap model of convection, and describe a framework within which isolated substorms and disturbances during periods of more continuous solar wind-magnetosphere driving can be understood.
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