valley shape

The observations support the prediction that the U-shape electric equipotential contours at the discontinuity is accompanied by a S-shape contour equatorward, which is associated with a second enhancement of height integrated Pederson conductivity and a valley in the latitudinal profiles of the ionospheric E-fields.

这支持了该理论所说的在电等位U-位形低纬侧有S-位形存在以及与之相应的电离层电导率的第二增强区和电场凹陷区等现象。

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But some studies show that it extends into the mountain land, shrinks to the shape of trumpet to link up with the third terrace in the river valley.

但不少研究资料表明，它向山地内部延伸，逐渐以喇叭口状收缩与河流谷地内的第三级阶地面相连。

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