Aurora is diverse, colorful, different in shape and incomparable in beauty, and nothing in nature can match it. It is difficult for any mark to draw that unpredictable dazzling light in the cold polar air. Aurora sometimes appears for a short time, just like the fireworks of the festival flashed in the air and disappeared without a trace; Sometimes it can shine in the sky for hours; Sometimes like a ribbon, sometimes like a flame, sometimes like a colorful giant screen; Some colors are changeable and endless; Some are just silvery white, like cotton wool and white clouds, solidified; Some of them are unusually bright, covering up the brilliance of the stars and the moon; Some are very light, like a bunch of moss; Some structures are simple, like a curved arc, showing a light green and reddish tone; Some are like colored silks or ribbons thrown into the sky, flying up and down; Some are as soft as scarves, fluttering in the wind, showing purple and crimson colors; Sometimes the aurora appears on the horizon, just like the morning light; Sometimes it is as bright as camellia and red; Sometimes the aurora gathers together like a curtain; Sometimes it shoots many beams, just like a proud peacock, flying with butterfly wings.
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Aurora (or aurora or northern lights) appears over the high magnetic latitudes of the earth, which is a colorful luminous phenomenon. Aurora is produced by the high-energy charged particle flow (solar wind) from the earth's magnetosphere or the sun exciting (or ionizing) molecules or atoms in the upper atmosphere. Aurora has three conditions: atmosphere, magnetic field and solar wind. These three are indispensable. Aurora not only appears on the earth, but also on other planets with magnetic fields in the solar system.
Early point of view
For centuries, this has been a mystery of astronomical phenomena that people have speculated and explored. Once upon a time, Eskimos believed that ghosts and gods led the souls of the dead to the aurora.
The torch of heaven. /kloc-in the 0/3rd century, people thought it was the light reflected by the Greenland ice sheet. It was not until the17th century that people called it the Northern Lights-Arctic Dawn (the same light seen in the South Pole is called the Southern Lights). With the progress of science and technology, the mystery of aurora is more and more known to us. It turns out that this beautiful scenery is the work of cooperation between the sun and the atmosphere. Among the various forms of energy created by the sun, such as light and heat, one kind of energy is called "solar wind". The solar wind is charged particles ejected by the sun, and it is a powerful charged subatomic particle stream, which can cover the earth, so it belongs to the plasma state. The solar wind flows around the earth over the earth and hits the earth's magnetic field at a speed of about 400 kilometers per second. The earth's magnetic field is shaped like a funnel, with its tip facing the north and south poles of the earth, so charged particles emitted by the sun settle along the "funnel" of the earth's magnetic field and enter the polar regions of the earth. The upper atmosphere of the poles, bombarded by the solar wind, will glow and form aurora. What is formed in the Antarctic region is called Antarctic light. What is formed in the North Pole is called the Northern Lights.
2. Introduction to the composition of the Northern Lights. The word "50-character aurora" comes from the Latin Ios.
Legend has it that Ios is the incarnation of "Dawn" in Greek mythology, the daughter of the Greek god Titan and the sister of the sun god and the moon goddess. When humans first looked up at the sky and saw the Northern Lights, the Northern Lights were always a "mystery".
For a long time, people have developed their own aurora legends. Eskimos believe that "Aurora is a torch for ghosts and gods to guide the souls of the dead to heaven". The aborigines, on the other hand, regard "aurora as the appearance of gods, and think that the fast-moving aurora will make the gods trample on the empty voice, take away people's souls and leave bad luck".
For a long time, the cause of aurora has been debated endlessly. Some people think that it is a fire burning at the outer edge of the earth; Some people think it is light reflected from the sky after sunset; Others believe that it is an energy released by polar ice and snow at night after absorbing and storing sunlight during the day.
It was not until man sent a satellite rocket into space that the mystery of this celestial phenomenon was explained physically. Aurora is essentially an optical phenomenon excited by the operation of atoms and molecules in the uppermost layer of the earth's atmosphere (above the ground 100-200 km).
It consists of three elements: the sun, the wind, the earth's magnetic field and the atmosphere. The so-called "solar wind" is an energy that the sun constantly radiates to the universe. It consists of electrons and protons.
Due to the intense activity of the sun, countless charged particles are emitted. When charged particles flow to the earth and enter the range of the earth's magnetic field, they will enter the upper atmosphere near the north and south magnetic poles at high speed along the earth's magnetic field lines, and collide with particles such as oxygen atoms and nitrogen molecules, resulting in "electromagnetic storms" and "visible light" phenomena, which become a striking "aurora". .
The sunset glow is orange-red. As the sun sets, the beautiful sunset gradually overflows from the horizon. The setting sun also changed from half moon cake to crescent moon covered by sunset glow, and finally gradually fell asleep.
The sunset glow dyed the western sky red. Shining slightly in every corner. The sunset glow at this time, like a shy little girl, is only painted with a layer of orange. The clouds in the sky are blurred and changed into various forms. Some are like a lamb, running on the big grass; Some are like doves of peace, flying freely. The sunset glow is mysterious, and soon it turns pale red. At this time, it seems that everything in the world is shrouded in sunset clouds, as if floating among flowers. At sea, quietly. Sunset is a little reluctant, try my best. That color makes people feel elusive and unforgettable.
The feeling of darkness has gradually approached us, but the sunset glow has not given in, and he still insists on his own beauty. The breeze blew, as if I felt the end of the sunset glow. At the edge of the sky, the reddish clouds also dispersed. Reluctantly, he put on a black veil and walked away.
It's getting dark, and the sky is shining with fuzzy spots, jumping on it like elves. The night is also illuminated by lights, and the night is more beautiful against the brightly lit city.
I recall the beautiful sunset and can't help admiring his beauty. The morning glow is magical, but I think the sunset glow is more beautiful. Because he is beautiful and natural, beautiful and simple, let me know that he has an indomitable spirit. Don't we need this in our study and life?
Thinking about thinking, I looked at the sky and was intoxicated. ...
4. Write a composition describing the appearance, 500 words. When I was 6 years old, I was sick and didn't even have a hair on my head. The children laughed at me and called me "the bald monk". Whenever this time, I cover my ears with my hands and my head seems to explode.
I didn't get sick until I was 8 years old. When I look in the mirror, my hair grows out. Then it was dark and bright, no worse than anyone else. No one calls me "the bald monk" anymore. Grandma sat beside me combing her hair, frowning and always muttering to herself.
Her hair is surprisingly much, covering her shoulders, chest and knees, hanging to the ground, black and blue. She picked up her hair from the ground with one hand, carried it, and had a hard time putting the sparse comb teeth into her thick locks.
5. A composition describing a thunderstorm 500 words In the fourth grade of the sixth grade of Huaying Bilingual School in Zhaodong City, Heilongjiang Province, it suddenly thundered, and the dark clouds were like a group of roaring wild horses.
Layers overflow the top of the head, getting thicker and thicker, and the pressure is getting lower and lower, as if standing on the roof can tear off a piece. The sun was so scared that I didn't know where to hide. It seemed that someone had set the clock to night, and it was dark between heaven and earth.
It is going to rain! We ran back to the classroom. Unfortunately, the power went out again, and neither table could see the teacher's face, let alone the words on the blackboard.
Scratching. Ding dong! Raindrops as big as copper coins beat rhythmically on the glass windows and iron tiles. "Hey!" Another big thunder! Tianhe seems to have burst, and the pouring rain is pouring down.
Lightning flashed and the branches swayed wildly in the wind and rain. Clouds of white fog rose from the roof, and the water on the eaves leaked down like a waterfall.
In a short time, the streets and yards became a Wang Yang, and the water wall more than one meter high splashed where the car passed, and the wind set off layers of water waves. At this moment, we seem to be sitting on a big ship sailing in the wind and rain.
The day is getting brighter, the rain is getting smaller, the drizzle is like milky fog, and the trees and grasslands are flowing with refreshing green. The clouds have opened, the sun has come out, and everything on the earth is like filtered air, with the fragrance of flowers and plants ... Instructor Zhang Yudongshan Class 23 (5) Today, the weather is extremely sultry, making people feel breathless. I think it will definitely rain soon.
In a short time, the sky was overcast and seemed to collapse, and lightning swept in with the sound of thunder, as if the whole sky had been split, and the wind was unwilling to lag behind. It blew with a bang, blowing flying leaves and roots. The heavy rain began to fall, and the raindrops as big as beans kept falling like pearls with broken lines. It is raining harder and harder. The rain that fell on the ground quickly merged into a stream, giggling, singing, jumping and running forward. Raindrops are like pearls, sprinkled on the river and rippling on the calm water.
The clever fish jumped out of the water as if to suck pearls. Rain lashed buildings, trees and asphalt roads.
The rain kept pouring down, like a thousand needles, sewing the sky tightly. Heavy rain is like crying on a child's face when he speaks, and smiling when he smiles.
It stopped when it didn't rain, the air was particularly fresh, the leaves became greener, and a rainbow appeared in the blue sky in the distance, like a giant arch bridge across the sky. It is very cool when it is windy.
Teacher's comment: The author of this article observes carefully and clearly. According to the sequence of before rain, during rain and after rain, the characteristics of thunderstorm are grasped and described in detail.
Lei Yu (Composition) He Haiyan, Grade 4, Xiaohe Township Central Primary School, Ganzhou District, has a thunderstorm in summer. After lunch, I sat at the window and did my homework. I feel a little cold. It's going to rain.
At the moment, the wind is blowing hard and the sky is gloomy. Then it began to rain.
It is raining harder and harder, and it is threatening. The rain brushed down like countless lines, scouring the rows of trees in front of the door.
Suddenly, the rain blew into the window with the wind and wet the exercise book. I quickly closed the window. The rain poured down.
I looked out through the glass window, and there was a huge bead curtain hanging between heaven and earth, which was gray. Rain dripped on the roof tiles, splashing, and the whole roof was shrouded in mist, and the leaves and flowers were bright green.
The rain is getting smaller and smaller, the sun is coming out of the clouds, and the earth is shining with great light. The earth is fresh. Rainbow hangs in the vast sky like an overpass.
When I opened the window, an obvious earthy smell came to my face. A flock of birds fly freely under the blue sky and rainbow. They fly higher and farther ... (Instructor: Xing Limin) Thunder rumbles in the distance in the fourth grade of the experimental primary school in Dongtai City, Lei Yujiang.
Soon, it began to rain. The raindrops as big as beans began to scatter, then became bigger and denser.
Strips of rain are woven into a "rain net", covering the whole city. I ran downstairs and rushed into the rain curtain.
"Wow, what a heavy rain!" I suddenly feel closer to nature. Countless raindrops are alive and kicking: some draw vertical lines in the air, some are "bullying", and some simply jump around on the roof.
Whether it is drifting sideways or sideways, life is short and disappears instantly; Their life is eternal-it blends into the earth wholeheartedly! Looking from a distance, it was a haze. The hazy house seems to be a fairy tale city built by building blocks; The trees are foggy, too, and the green is faint.
The wind shook the branches of the tree warmly, and the tree danced happily with the wind waving its arms! I don't know when the rain stopped quietly and the dark clouds gradually dispersed. In the sky, the sun appeared, and a beam of golden light shone in all directions.
6. A 500-word composition describing winter rain. The continuous rain for several days has brought inconvenience to everyone's travel.
The Chinese New Year is coming, and this kind of weather makes people feel a little depressed. Take a taxi home from Longtan Bridge at noon.
I left in a hurry this morning without an umbrella. At this time, I can only accept the baptism of heavy rain.
When I finally stopped a taxi, my down jacket had turned into a raincoat. The taxi driver is a "dear sister". Seeing my embarrassment, she smiled and said, "It's raining so hard that I don't take an umbrella when I go out." I smiled shyly and gave my home address, so I just bowed my head and slapped the rain on my body.
Suddenly I looked up and found that I had reached the pedestrian street. Hey, why did my sister drive here? Isn't this "the opposite direction"? So, I asked my sister, "I went to Wanhong Village. How did I drive here?" My sister patted her head and quickly apologized: "Sorry, sorry, I have the wrong address."
Then I immediately turned around and started pricing again. When waiting for the red light, "my sister" was still patting her head regretfully.
If I hadn't lisped in my panic, I don't think she would have gone so far wrong. My face will turn red. When I get home, the expression of "Dear Sister" always appears in front of my eyes.
In the face of a child, it is rare for her to use such sincere tone and sincere service! I am very touched and have a kind of respect and gratitude. I regret it. Because I was in a hurry to go home, I didn't get the taxi receipt and didn't see the license plate number clearly.
Thanks to this "dear sister", your excellent service attitude is like a ray of sunshine in the winter rain, which warms my heart. Thank you! Write this article, wish you-"your sister", and wish all "brothers" and "your sister" a safe journey.
In the afternoon of 500 words, a strong wind suddenly blew outside. Chickens and dogs crowed everywhere in the village, and the room became dark. It will rain. The leaves shook violently, and there was a "rumbling" sound in the distance, as if it were coming from the ground.
I looked out of the window. The sky was overcast and windy. There are few pedestrians in the street, only a few cars pass by quickly. After a while, it began to rain cats and dogs outside. My window rattled in the wind, so my mother quickly locked it. During the thunderstorm, I can't turn on the TV, computer, tape recorder and repeater ... I want to draw.
Another gust of wind dazzled people. I don't know whose window is open, but there is a sound of broken glass. Wet prints of raindrops appeared on the ground and gradually became larger. The thunder was loud, as if encouraging the rain: everybody jump down! It began to rain heavily. The thunder became brittle, grandma said, this is standing thunder, the most dangerous. Thunder "click" and "click" are really like those written in Journey to the West. Lei Gong and Rem are dancing in the clouds with sledgehammers. The lines of lightning are getting thicker and thicker. When it thunders, a flash of lightning cuts through the sky and goes straight into the ground, making the sky look like day. The rain is intermittent, sometimes big and sometimes small, and the sound of "rushing" gradually fades away. I wonder when it will stop. Birds with nests have returned to their nests. Those without nests hide under the big tree, shaking the rain from time to time, and then hiding their heads deeply in their necks. This lightning is getting faster and faster, and it appears and disappears. Like a little boy hiding by your side, wearing bleached clothes. That white color is difficult to adjust on the palette. He combined light yellow, orange yellow, gray and light-like white to form the color of this lightning.
After the thunderstorm, the sky seems bluer and the air is fresher. Maybe the thunderstorm cleaned them up! After a while, lightning hit the horizon, the wind ran away, and the rain quietly left.
The ground in the village is very wet. The flowers, grass, trees and trees there are dripping, and the leaves are covered with "new clothes" of glittering and translucent beads. There is a small puddle in front of the door, the dog is licking the water in the puddle, and the chicken comes out of the henhouse and feeds leisurely in the yard. Pigeons have come, and the weeping willows by the river are more beautiful.
What a thunderstorm!
8. The composition describing Anyang River explains the beautiful Anyang River in 500 words.
On Sunday, my father took me to play by the Anyang River.
Anyang River is so beautiful! There are microwaves on the river, and the river is green, like a piece of jade. The river flows eastward, really clear water flows eastward! Huh? There are still some ducks catching fish on the water. Sometimes a small circle appears on the river, which is a small fish jumping in the game. Someone is washing clothes by the river. The south bank of the river is a beautiful park surrounded by water, and the north bank has green belts and leisure squares. The willows there have tender yellow leaves; The grass there is green; The winter jasmine there blew the golden horn; The holly there grows new green leaves. . Lots of flowers and trees! It's beautiful here!
However, there is a sewage outlet in the river, from which dirty water keeps flowing out, forming a pollution zone tens of meters long on the south bank of the river. There are all kinds of rubbish floating on the river, including plastic bags, foamed plastics and cartons. There are cigarette butts, waste paper and ashes left by the fire on the shore. These dirty things not only pollute the environment, but also affect the mood of tourists.
Anyang River is beautiful, but people's awareness of environmental protection is still very poor, and some people unconsciously throw garbage there. Let's act together, start with small things, don't litter yourself, stop others from littering, and create a beautiful home together!
9. Write a 500-word composition about Niangniangtan. Our hometown is located at the foot of Lushan Mountain. This is a beautiful place. There are many places of interest here, including Lushan Forest Park, grotesque Nine Heaven Cave, fragrant and charming Peach Blossom Island, and the Cowherd and Weaver Girl scenic spot across the Milky Way. But I think the most beautiful is the waterscape park.
Yi river Yuanshuijing Park is 9.75km from Yiyuan ape-man site at the foot of Lushan Mountain to the intersection of Mantis River and yi river.
On a sunny day, we came to the waterscape park. The river here is very clear, and a breeze is blowing. The river is sparkling and sparkling, and many small fish are playing freely in the river. The flowers on both sides of the waterscape park are colorful, colorful and colorful. The grasslands on both sides of the river are full of vitality and green grass.
Waterscape Park is more beautiful at night! Hundreds of colored lights on both sides of the highway were turned on in the blink of an eye and reflected in the water. Coupled with the neon lights and decorative lights of tall buildings, they are colorful and brightly lit, forming a "sea of lights and a world of light".
But the most wonderful thing is the fountain in the waterscape park. Look! Countless water columns spray evenly in the sky, and under the illumination of lights, various patterns change, like a curved rainbow; Like a colorful pearl water curtain; Proud as a beautiful peacock; Just like a beautiful fairy spreading flowers ... it's really colorful and gorgeous!
I am very proud of the waterscape park with sky blue, green land, clear water, bright lights and fresh air.