分立式极光的发光强度较大

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分立式极光的发光强度较大，激发它的电子是经过沿磁力线方向的亚稳态电场的加速，电子流能通量密度较高，电子运动方向主要沿磁力线方向；而弥散状极光，是由于磁层中电子受电磁波的散射或者磁场位形的变化影响，进入损失椎，从而到达电离层，这些电子虽然能量较高，但能通量密度并不很高，所以会造成范围较大但亮度较弱的弥散状极光。

分立式极光与弥撒式极光并不是孤立存在的，经常同时出现，有时会相互转化。分立式极光与弥撒式极光之间的联系也是极光物理学研究的课题之一。

最佳观光区——“极光卵”

极光是太阳风与地球磁场作用产生的结果，所以它在地球上出现的区域也与地磁息息相关，极光主要分布在以南北磁极为中心的椭圆形区域，这个区域被称为“极光卵”。

这个“极光卵”映射到地球磁场中就是地球偶极磁场的闭合磁力线与开放磁力线的边界，这里也是磁层中能量和粒子向地球电离层传输的主要通道，也是地面上能看到极光的主要位置。

“极光卵”的大小与位置与磁暴强弱有直接关系，磁暴越强，“极光卵”的半径越大，位置也越偏向低磁纬度地方，同时环形区域的宽度可能会增加，这也意味着低磁纬度地区看到极光的机会更大。

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