极光的英文介绍,演示ppt
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极光PPT课件
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往往归功于法国数学家和天文学家加桑迪，
因为英国天文学家、数学家哈雷在1716年的
一期《哲学学报》上提到加桑迪在1621年观
看描述了一次大的极光，并给极光起了名字。
但美国加利福尼亚大学的西斯库近年来对
“极光”一词的起源作了新的研究，证明这
个词最早是由意大利物理学家和天文学家伽
利略发明的。伽利略和他的学生在1619年出
2020年10月2日
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重要信息
1、极光是天空中一种特殊的光，是人们 能用肉眼看得见的唯一的高空大气现象。 它常常出现在南北半球的高纬地区，主 要在南极区和北极区。这种光的美丽显 示，是由高空大气中的放电辐射造成 的。
2、出现在南半球的光叫做南极光，出现 在北半球的叫做北极光；南北极光泛称 极光。
6、第三部分第二段（极光发光原理的说明）
2020年10月2日
11
加工重要信息
要求：
句式更
加工信息
（需加工的句子主要在1、4、6点）
修改结果：
1、极光是人们唯一能用肉眼看得见的高空大 气现象。它由高空大气中的放电辐射造成，主 要出现在南极区和北极区。
2020年10月2日
7
2020年10月2日
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启发引导
1、说明文的目的是什么？ 介绍事物特征，阐明事物的道理。 2、三个神话故事在全文中起什么作用？ 引起下文，激发兴趣。因此故事本身不是全文
重要信息。 3、说明文重点在介绍事物“是怎样”还是
“不是怎样”？ 是前者，所以应略去关于三种错误认识的介绍。
的圆环形，而是更像卵形。极光的光谱线范围 约为3 100～6 700埃。其中最重要的谱线是5 577埃的原子氧绿线称极光绿线。极光的出现
极光
长期观测统计结果表明，极光最经常出现的地方是在南北磁纬度67度 附近的两个环带状区域内，分别称作南极光区和北极光区。
极光之美
极光被视为自然界中最漂亮的奇观之一。如果我们乘着宇宙飞船，越 过地球的南北极上空，从遥远的太空向地球望去，会见到围绕地球磁 极存在一个闪闪发亮的光环，这个环就叫做极光卵。由于它们向太阳 的一边有点被压扁，而背太阳的一边却稍稍被拉伸，因而呈现出卵一 样的形状。极光卵处在连续不断的变化之中，时明时暗，时而向赤道 方向伸展，时而又向极点方向收缩。处在午夜部分的光环显得最宽最 明亮。
探索极光之美
相关简介 产生原理 相关特征 分布区域 极光之美
简单介绍
极光（Polar light，aurora）是由于太阳带电粒子（太阳风）进入地球 磁场，在地球南北两极附近地区的高空，夜间出现的灿烂美丽的光辉 。在南极称为南极光，在北极称为北极光。极光一般呈带状、幕状、 弧状、放射状，这些形状有时稳定有时作连续性变化。
探索极光之旅
相关特征
极光是常常出现于纬度靠近地磁极地区上空大气中的彩色发光现象。 极光一般呈带状、弧状、幕状、放射状，这些形状有时稳定有时作连 续性变化。 从科学研究的角度，人们将极光按其形态特征分成五种：一是底边整 齐微微弯曲的圆弧状的极光弧；二是有弯扭折皱的飘带状的 极光带； 三是如云朵一般的片朵状的极光片；四是面纱一样均匀的帐幔状的极 光幔；五是沿磁力线方向的射线状的0～130千米处。美国匹兹堡磁纬高，就 比在北京看到极光的机会大多了。2004年11月7日晚，较强极光出现 在匹兹堡。 肉眼能看出绿色，红色。2003年11月20日傍晚，极光出 现在匹兹堡南方地平线，一小时后消退。半夜时又出现在北方低空。 2003年10月30日出在匹兹堡的极光，虽然是在光污染严重的市内，但 仍能看到红色的光芒。但有些极光要高得多。1959年，一次北极光 所 测得的高度是160千米，宽度超过4800千米。在地平线上的城市灯光 和高层建筑可能会妨碍我们看光，所以最佳的极光景象要在乡间空旷 地区才能观察得到。
极光的英文介绍,演示.
极光
The aurora of Earth is produced by excitating (or ionizating) atomic or upper atmospheric Molecular that are from the Earth’s magnetosphere or flow of charged particles of solar. There are three conditions To generate aurora: Atmospheric, magnetic and the solar wind.
In a ancient Chinese book named “Shan hai jing”,aurora has been recorded. It says that an immoral living in the north has a shape that likes a red snake. It can twinkle in sky at night. People call it Chu Long, whith, In fact, is aurora. Nhomakorabea幻日
Sun dogs is an optical phenomenon of the atmosphere. there are a lot of hexa-
gonal columnar crystals of ice floating in translucent thin clouds of sky. The crystals of ice occasionally arranges vertically in the air. When the sun light goes through the hexagonal ice, light will be refract in a order.
The aurora of Earth is produced by excitating (or ionizating) atomic or upper atmospheric Molecular that are from the Earth’s magnetosphere or flow of charged particles of solar. There are three conditions To generate aurora: Atmospheric, magnetic and the solar wind.
In a ancient Chinese book named “Shan hai jing”,aurora has been recorded. It says that an immoral living in the north has a shape that likes a red snake. It can twinkle in sky at night. People call it Chu Long, whith, In fact, is aurora. Nhomakorabea幻日
Sun dogs is an optical phenomenon of the atmosphere. there are a lot of hexa-
gonal columnar crystals of ice floating in translucent thin clouds of sky. The crystals of ice occasionally arranges vertically in the air. When the sun light goes through the hexagonal ice, light will be refract in a order.
aurora-极光
The heat moves to the surface. In some places, the strong magnetic fields push their way up through the surface. The plasma drags the magnetic field further
magic miraculo beautiful al us marvello brillian us unimagina spectacul t Auror ble gorgeo ar a us ——Penny 庞钰洁 splendi wonderf d fantast ul
aurora 1.the first light aurora of day synon s ym cockcr aurora daw ow daybre en ak dayspr sunri ing
高能粒子的碰撞 高空大气层
磁层 地磁场
Aurora Borealis Department of Physics University of Oslo Aurora Australis
北极光 南极光
the process
An aurora starts from the sun. The sun acts like an enormous power planet. These nuclear reactions
2.atmospheric 光束 phenomenon 高能太阳粒子 bands of light 磁力线 charged solar particles magnetic lines of force
大气现象
3.(Roman mythology) goddess of the dawn; counterpart of Greek Eos
路虎揽胜极光EVOQUE
• 可以将多达 10张光碟加载至存储 CD 库。只有 CDDA 光碟才
能加载到存储 CD库。 • 请勿强行将 CD/DVD 插入加载槽。 • 不要使用形状不规则的光碟，也不要使用附有防刮保护膜 或粘贴有自粘标签的光碟。
• 双格式、双面光碟（DVD Plus 和CD/DVD 格式）比普通光碟
厚一些，因此无法保证此类光碟在系统中正常播放，可能
• 揽胜极光中网格栅上取消了路虎的椭圆loห้องสมุดไป่ตู้o ，因为LRX属
于路虎的，而揽胜极光现在属于真正的揽胜系列
• 2.0 升涡轮增压式直接喷射 (GTDi) 汽油发动机为双顶置凸 轮轴直列四缸发动机，最大功率5500 转/分时 240 马力， 最大扭矩1750 转/分时 340 牛米
• 2.2升涡轮增压式SD柴油发动机最大功率190马力
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路缘视图 交叉路口视图 4. 摄像头设定（日本）
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用超声波传感器： ������ 四个传感器位于
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后保险杠内
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北极光的英文课前演讲ppt
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My dream is to go to Iceland to see the northern lights. I hope that all the people can see the places of interests that they want to go to with their lovers during their lifetime. :)
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There are many places on earth that can see the aurora. Aurora is also seen in Mohe County, China.
Mohe is located in China's northernmost, belonging to the Heilongjiang area of Greater Khingan Range.When going to the summer solstice， Mohe dawn and sunset with sky day phenomenon.
One of my favorite things --aurora
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Long before people started shooting fireworks into the sky, nature had its own light show, the aurora.
The aurora appears on the planet over the high latitude regions, is a phenomenon of the bright and colorful light. There are three conditions for the aurora: the atmosphere, the magnetic field, the energetic charged particles.The aurora is not only on earth, but some of the other planets in the solar system that have a magnetic field.
My dream is to go to Iceland to see the northern lights. I hope that all the people can see the places of interests that they want to go to with their lovers during their lifetime. :)
-
There are many places on earth that can see the aurora. Aurora is also seen in Mohe County, China.
Mohe is located in China's northernmost, belonging to the Heilongjiang area of Greater Khingan Range.When going to the summer solstice， Mohe dawn and sunset with sky day phenomenon.
One of my favorite things --aurora
-
-
Long before people started shooting fireworks into the sky, nature had its own light show, the aurora.
The aurora appears on the planet over the high latitude regions, is a phenomenon of the bright and colorful light. There are three conditions for the aurora: the atmosphere, the magnetic field, the energetic charged particles.The aurora is not only on earth, but some of the other planets in the solar system that have a magnetic field.
Aurora极光简介
with graininess.
01 02 03
Red Green
Color
Yellow and Pink
Blue
04
At the highest altitudes, excited atomic oxygen emits at 630.0 nm (red); low concentration of atoms and lower sensitivity of eyes at this wavelength make this color visible only under more intense solar activity. The low amount of oxygen atoms and their gradually diminishing concentration is responsible for the faint appearance of the top parts of the "curtains". Scarlet, crimson, and carmine are the most often-seen hues of red for the aurorae.
At yet lower altitudes, atomic oxygen is uncommon, and ionized molecular nitrogen takes over in producing visible light emission; it radiates at a large number of wavelengths in both red and blue parts of the spectrum, with 428 nm (blue) being dominant. Blue and purple emissions, typically at the lower edges of the "curtains", show up at the highest levels of solar activity.
芬兰极光英文介绍
芬兰极光英文介绍English:The Northern Lights, also known as the Aurora Borealis, are one of nature's most mesmerizing displays. They occur when charged particles from the sun collide with gases in Earth's atmosphere, creating a stunning array of colors dancing across the night sky. In Finland, the Northern Lights can be witnessed in regions north of the Arctic Circle, such as Lapland, during the winter months when the nights are long and dark. The phenomenon is deeply ingrained in Finnish culture and mythology, often associated with mythical creatures and ancient tales. Visitors flock to Finland from around the world to witness this ethereal spectacle, often combining it with other winter activities such as husky sledding, snowmobiling, and ice fishing. The remote wilderness of Finnish Lapland offers some of the best opportunities to see the Northern Lights, away from light pollution and amidst breathtaking natural landscapes. Whether seen from the comfort of a glass igloo or while trekking through snow-covered forests, experiencing the Northern Lights in Finland is a truly unforgettable adventure that leaves a lasting impression on all who witness its beauty.中文翻译:北极光，也称为极光，是大自然中最迷人的景观之一。