![]() Discuss the results together in the classroom and collect all observations. Students can also take photos or short videos of the clouds. Observe clouds in the twilight together with the students or ask the students to observe them independently. They can only be observed low in the north when the Sun is from 6 to 16 degrees below the horizon. Glowing night clouds looking like cirrus clouds are about one kilometer thick and reflect sunlight. The clouds at a height of about 80 km consist of small particles of size 3 x 10¯ 4 mm, which have absorbed water vapour. They have those names because they are light even in the darkness of the night. What interests the astronomers most are the illuminating or glowing night clouds. Discuss the concepts and impressions related to the phenomenon.Ģ) In the twilight it is possible to explore clouds in the light sunset sky. Pictures can be compared with each other. The students can draw a rainbow or a scenery with a rainbow on a large paper. In the picture there are the ends of two rainbows in the evening sun after a heavy rain fall (picture IH, Finland). ![]() Red light comes to the eye of an observer in an angle of 42 degrees and violet light in an angle of 40,3 degrees. Red is on the outer edge and violet on the inner edge of the rainbow. colours of violet, blue, green, yellow, orange and red, can be seen if the rainbow is bright. The centre of the rainbow is on the line from the Sun through the observer. The observer sees the rainbow when the Sun is behind his back. Colours of the rainbow are caused by the refraction of sunlight in falling raindrops. The three others are known mostly to the astronomers, but not even they have seen them all in nature.ġ) First take a closer look at a rainbow. The first four are familiar to everyone and they can easily be seen. In everyday language this celestial phenomenon is called a shooting star.Įxplore more closely some light phenomena of the atmosphere. To the observer it seems like these glowing objects are falling stars. Meteors burn out in the air but meteorites are still burning when they hit the ground. When falling onto the ground they start to glow in the atmosphere due to friction. Also meteors and meteorites cause light phenomena in the atmosphere. Reflection of sunlight from raindrops in a rainbow or from snow crystals in a halo phenomenon show beautifully how diverse the essence of nature in its essence is. Their peaceful glow or colourful dance inspires human imagination in a magical way. The Northern Lights are the most impressive sight in the northern sky in Lapland. One of the most familiar phenomena is the sky reddening near the horizon at sunrise and sunset as well as the Moon and the Sun seemingly enlarged low at the horizon. They may occur in daytime or at night and they are caused by the atmosphere. Explorations: When observing the phenomena in the sky, it is possible to see not only astronomical phenomena but also nature’s own phenomena.
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