搜索 - 科创

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这个启动之后应该还有龙卷风效应考虑到大气情况，辐射功率达不到1KW/㎡，再加上太阳并非竖直照到地面上，因此还要再乘上太阳高度角的sin值，实际辐射热功率就更小了，一天下来每平方米可能只有接收到2KW·

如果太阳高度角较低，当您发现它时，不妨查看一下晕圈的两侧有没有两个亮斑——那是22°幻日。像剑一般竖直穿过太阳的冰晶晕是日柱。接下来看一看晕圈的顶部有没有一个与它相切的弧——上切弧（22°切弧）。

早晨6:30左右抵达全家便利店（复旦邯郸校区南区门口的店，窗户朝东），此时太阳高度角很低且有较明显云层，使用Light Meter手机app粗测了一下桌面照度，约3000Lux（未截图）。

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