The use of water in the roof has also been proposed for lower-latitude countries-a “roof pond” system. At such latitudes, the horizontal roof provides a better absorber than vertical walls, and in addition，it may be possible to exploit night-time cooling of the water mass during the summer months. This can provide a means of reducing overheating the following day. The dynamic use of insulation panels or covers is an important aspect of the successful functioning of this technology. During the winter, the water mass is uncovered during the day, but covered at night to retain heat. For summer months, the opposite schedule is used. The water is covered during the day so it absorbs heat from the building, and it is uncovered at night to allow heat loss.
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In the northern Hemisphere, auroras are more commonly seen at high latitudes near the Arctic Circle, such as northern Alaska, Canada, and Scandinavia.
在北半球，靠近北极圈的高纬度地区极光更为常见，比如阿拉斯加北部、加拿大、和斯堪迪纳维亚地区。
Such waves occur most frequently at stormy latitudes, where the storms tend to come in groups traveling in the same direction, with only short periods separating them.
在那里风暴常常是成群出现的，它们沿着同一方向运动，彼此间相隔时间很短暂。
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