Aurora Borealis Essay

The Aurora Borealis is a pretty-pretty display of lights created by nature that appear in the night sky. Aurora Borealis, the Latin name of the forenoon of the northern hemisphere, means the red dawn of the north. The name comes from the famous Italian scientist Galileo Galilei who, among other things, studied the lights more or less the year 1600. In Rome, were Galileo was living, the red color dominates, but the most common color is actu exclusivelyy greenish-yellow, which I will cover later in the presentation. The Vikings in the year 700-1000 called it simply northern lights, and in advance(prenominal) England they called it The Merry Dancers referring to the right smart the aurora moves.Originating in the atmosphere broad(prenominal) above the surface of the earth, the northern lights thunder mug be seen during dark hours in the polar regions of the northern hemisphere. in that location are similar lights that appear in the southern hemisphere. The southern lights and n orthern lights are identical phenomenons. When you have a northern lights display, you will overly have an equally large southern lights display. The only reason we dont hear to the highest degree southern lights much is that there arent much settlements in Antarctica. federationern lights pass by well-nigh the geo magnetic South Pole. The scientific name for southern lights is Aurora Australis.The amazing move onrence of the aurora actually starts high above the earths atmosphere. The sun emits a continuous stream of ionized gas during its solar flares. This gas consists of electrons, protons and helium nuclei. The stream of gasses leaving the sun is known as the solar meander. As the solar wind approaches Earth, the particles are influenced by the Earths magnetic field and are guided toward elliptic zones more or less the magnetic poles. The solar wind particles then collide with air molecules in the upper atmosphere. The collisions impart null to air molecules, primaril y oxygen and nitrogen, and cause them to emit light, called the aurora.The display of lights occurs only above altitudes of 80 kilometers and now and then above 500 kilometers. The average altitude is between 110 and200 kilometers. Due to the nature of our magnetic field, the aurora can only been seen in certain split of the sky. The northern lights exist in an oval shaped area called the aurora oval, and this oval rotates with its center in the geomagnetic north pole. The size of this oval varies on an hourly basis with the amount of incoming solar particles. The best observation sites of the aurora borealis are underneath the oval where there is the most geomagnetic activity. Geomagnetic energy is measured in Kp index, which is a scale from 0 to 9. A high Kp indicates a higher chance of auroral activity. One usually needs a Kp of almost 3 to be capable to witness an aurora.The oval usually occurs over northern parts of the Nordic countries, including all of Greenland and Svalbar d, northern parts of Alaska, Canada and Russia. Here one may observe northern lights 90% of the time, which is approximately every clear dark night. though auroras occur all daytime, the day-side aurora has much weaker light than the night-side auroras. vigorous daylight also outshines the day-side aurora, so you will have to observe the aurora during night- usually in the hours around midnight. Further down south observation time decreases rapidly as one reaches the outskirts of the aurora oval. Though the oval usually stays high in the Northern Hemisphere it does have capabilities to reach parts of the southern United States. On November 6th, 2001, it reached down to Texas, and once every 200th year it goes all the way down to the equator.After years of recording the aurora, one has discovered that February, March and October enjoys a little phone number more aurora time than other months, although this doesnt mean spectacular displays wont occur during other months. Auroras a re more frequent late autumn and early spring. Brilliant auroras often occur at 27-day intervals as active areas on the Suns surface face Earth during its 27-day revolution cycle. Also, the sun has an eleven year sun spot cycle. Every eleventh year the number of spot peak and the number of solar particles thrown out into space increases dramatically. Aurora activity remains high one to two years after this event, which is called Solar Maximum. We had solar maximum around new year, 2001, and the bordering is expected to occur around 2011 or 2012.These lights come in a variation of colors. The Sun radiates all visiblecolors, which is why sunlight appears white. The spectrum of visible light associated with the aurora is much narrower. The aurora is caused by particles of the solar wind colliding with atmospheric atoms and ions. The atmosphere consists mainly of nitrogen and oxygen, which when hit, emits characteristic colors. The colors that these gasses emit are green, red, bluish, and yellow. There are also seven differentiations in the shape that the auroras will take Homogeneous arc, arc with diversify structure, homogeneous band, band with ray structure, curtains, rays, and corona. These different shapes and colors form one of the earths greatest phenomenons that to this day continue to boggle the mind of scientists and everyday society.In the early 20th century, auroral research pore on light emission, altitude, distribution and color. Today, scientists strive to understand the processes that produce the various forms of the northern lights and attempt to justify their changes in time and space. Scientists are especially interested in the military units of solar activity on the Earths near-space. General interest in possible global climatic change has change magnitude in recent decades. Because atmospheric conditions in the altitudes of the aurora appear to have a long-term effect on weather, auroral research has received heightened attention.