The geoelectric field at Vostok, Antarctica: its relation to the interplanetary magnetic field and the cross polar cap potential difference
The geoelectric field at Vostok, Antarctica: its relation to the interplanetary magnetic field and the cross polar cap potential difference
复制标题
南极洲沃斯托克的地电场：其与行星际磁场和跨极帽电位差的关系
DOI：
10.1016/s1364-6826(99)00089-9
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发表时间：
1999
影响因子：
1.9
通讯作者：
W. French
中科院分区：
文献类型：
--
作者：
A. Frank;G. Burns;O. Troshichev;V. Papitashvili;E. Bering;W. French
1979年5月至1980年5月在南极东方（78.5°S，107°E，L=75.0）观测的13个月期间的垂直地电场与东方与昼侧磁层相连时的行星际磁场（IMF）分量By和Bz进行了关联。太阳风和地球磁场的相互作用通常会导致高纬度极地电离层中的反向阳等离子体流，这种等离子体流由黎明到黄昏的跨极帽电势差模式驱动。使用IZMEM模型来推断跨极冠电位差对测量的IMF条件下东方站电离层与地面之间电位差的贡献，我们表明这为所发现的IMF关联提供了一个可行的机制。我们证明了地电场与跨极冠电位差的直接关联与结果无关（Park，1976.南极洲东方太阳磁区对垂直大气电场的影响。Geophysical Research Letters 3（8），475-478），显示在东方测量的垂直地电场在IMF扇区边界通过后1-3天下降了15%。还提出了支持公园结果的证据，其机制尚待确认。
The vertical geoelectric field measured at Vostok, Antarctica (78.5°S, 107°E, L=75.0) over the 13 month interval May 1979–May 1980 is correlated with the interplanetary magnetic field (IMF) components Byand Bzat times when Vostok is connected to the dayside magnetosphere. No significant association with IMF Bxis found. The interaction of the solar wind and the Earth’s magnetic field generally results in anti-sunward plasma flow in the high-latitude, polar ionosphere driven by a dawn-to-dusk, cross polar cap potential difference pattern. Using the IZMEM model to infer the contribution of the cross polar cap potential difference to the potential difference between the ionosphere and the ground at Vostok for the measured IMF conditions, we show that this provides a viable mechanism for the IMF associations found. We demonstrate that the direct association of the geoelectric field with the cross polar cap potential difference is independent of a result (Park, 1976. Solar magnetic sector effects on the vertical atmospheric electric field at Vostok, Antartica. Geophysical Research Letters 3(8), 475–478) showing an ∼15% decrease in the vertical geoelectric field measured at Vostok, 1–3 days after the passage of IMF sector boundaries. Evidence is also presented supporting the Park result, for which a mechanism is yet to be confirmed.