Analysis of lightning field changes during active Florida thunderstorms
Analysis of lightning field changes during active Florida thunderstorms
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DOI：
10.1029/jd094id01p01165
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发表时间：
1989-01
影响因子：
--
通讯作者：
W. Koshak;E. Krider
中科院分区：
文献类型：
--
作者：
W. Koshak;E. Krider
一个计算机算法已经开发出来，以获得准确的值，闪电引起的云电场的变化在活跃的风暴条件下。该算法已被应用到从一个网络的地面电场米尔斯在美国宇航局肯尼迪航天中心和美国空军卡纳维拉尔角空军基地在两个风暴的部分期间获得的数据。使用最小二乘优化程序和点电荷（Q）和点偶极子（P）模型分析了由此产生的场变化。结果表明，当采用相同的分析准则和可比的偏差进行计算时，在活跃风暴条件下Q模式参数的值和时间变化与以前报道的小风暴的值和时间变化相似。P解的参数似乎随风暴间隔内的时间和从风暴到风暴。低海拔的P矢量都倾向于向上，而高海拔的P矢量几乎总是向下。当P解位于与Q高度对应的高度范围内时，P的方向趋于水平。由于Q解通常描述云对地闪电，而P解描述云放电（Maier和Krider，1986），因此P矢量的高度依赖性与经典的雷暴云电荷模型一致，该模型在与Q高度对应的高度处具有过量的负电荷。«少
A computer algorithm has been developed to derive accurate values of lightning-caused changes in cloud electric fields under active storm conditions. This algorithm has been applied to data obtained from a network of ground-based electric field mills at the NASA Kennedy Space Center and the U.S. Air Force Cape Canaveral Air Force Station during portions of two storms. The resulting field changes have been analyzed using a least squares optimization procedure and point-charge (Q) and point-dipole (P) models. The results indicate that the values and time variations of the Q-model parameters under active storm conditions are similar to those reported previously for small storms when the computations are done with the same analysis criteria and comparable biases. The parameters of P solutions seem to vary with time within the storm interval and from storm to storm. The P vectors at low altitudes all tend to point upward, and those at high altitudes almost always point downward. When a P solution is located in the altitude range corresponding to Q altitudes, the direction of P tends to be horizontal. Since Q solutions typically describe cloud-to-ground lightning and P solutions describe cloud discharges (Maier and Krider, 1986), the altitude dependence of themore » P vectors is consistent with the classic thunder-cloud charge model that has an excess negative charge at altitudes corresponding to the Q altitudes.« less