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<center>https://s26.postimg.org/8pa99g4t5/rege.jpg</center>
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<center>Aurora is a natural phenomenon that resembles the glow of light that flares in the ionosphere of a planet as a result of the interaction between the planet's magnetic field and the charged particles emitted by the sun. Aurora, sometimes referred to as polar light, is the display of natural light in the sky, especially seen in high latitudes (North and South Pole). Aurora is generated when the magnetosphere is sufficiently disturbed by the solar wind where the trajectory of the charged particles in both the solar wind and the plasma magnetosphere, especially in the form of electrons and protons, deposits them into the upper atmosphere (thermosphere / exosphere), where their energy is lost. Ionization and excitation resulting from atmospheric constituents emit light in various colors and complexities. The aurora form, occurring within the belt around the two polar regions, also depends on the amount of acceleration delivered to the precipitating particles. The acceleration of protons generally produces optical emission as a hydrogen incident atom after obtaining electrons from the atmosphere. Auron protons are usually observed at low latitudes.</center>
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<center><h3>Where The Aurora Occurred</h3></center>
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<center><em>On earth, aurora occurs in areas around the North Pole and magnetic poles. So the aurora will not happen at the equator.</em></center>
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<center>In northern latitudes, this effect is known as the <strong>Aurora Borealis</strong> (or northern light), named after the Roman Fajar Dewi, Aurora, and the Greek name for the northerly wind, Boreas, by Galileo in 1619. This is because in Europe, auroras often appear ruddy in the northern horizon as if the sun would rise from that direction. Aurora borealis always occurs between September and October and March and April.</center>
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<center>Aurora seen in the oval aurora can be overhead, but from afar they illuminate the polar horizon as a greenish light, or sometimes faintly red, as if the sun rises from an unusual direction.</center>
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<center>In contrast, the auroral phenomenon in the southern latitudes known as the <strong>Aurora Australis</strong> (or southern light) has similar traits. But sometimes the aurora appear on mountain tops in tropical climates. Aurora australis, features almost the same as the aurora borealis and changes simultaneously with the alteration of the northern auroral zone. This can be seen from the high southern latitudes in Antarctica, Chile, Argentina, New Zealand, and Australia.</center>
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<center><h3>Aurora Red Color</h3></center>
<center>https://s26.postimg.org/4jzcnj715/x_a_s_x_a_s_x.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>At the highest altitude, atomic oxygen emits 630.0 nm (red); low atomic concentrations and lower eye sensitivity at these wavelengths make this color visible only under more intense solar activity. The low number of oxygen atoms and the gradually diminishing concentration is responsible for the faint appearance of the upper "curtains". Scarlet, red, and carmine are the most commonly seen red for auroras.</center>
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<center><strong>Green</strong></center>
<center>https://s26.postimg.org/6kuhm3sk9/s_s_s_saurora-hijau-alaska-in-pictures_com.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>At lower altitude the collision is more often pressed 630.0 nm (red) mode: emissions 557.7 nm (green) somewhat dominate. Highly atomic oxygen concentrations and higher eye sensitivity on green make the most common green aurorae. Nitrogen molecules (nitrogen atoms becoming rare because of the high stability of the N2 molecule) play a role here, as it can transfer the collision energy with oxygen atoms, which then emit green wavelengths. (Red and green can also mix together to produce a pink or yellow color.) The rapid decline in atomic oxygen concentrations below about 100 km is responsible for the sudden ending appearance of the bottom edge of the curtain. Both wavelengths 557.7 and 630.0 nm correspond to the forbidden transition of atomic oxygen, a slow mechanism responsible for the graduality (0.7 s and 107 s respectively) of combustion and fading.</center>
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<center><strong>Blue</strong></center>
<center>https://s26.postimg.org/572uqstax/sx_ASxx_AX.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>At not so low altitudes, atomic oxygen is sparse, so that ionized nitrogen and nitrogen molecules take over in producing visible light emissions; radiating across a large number of wavelengths in both the red and blue spectrums, with 428 nm (blue) being dominant. Blue and purple emissions, usually on the lower edge of the "curtain", appear at the highest levels of solar activity. The molecular nitrogen transition is much faster than the transition of oxygen atoms.</center>
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<center><strong>Ultraviolet</strong></center>
<center>https://s26.postimg.org/5l46qedeh/sa_x_AXSAXASCADSaurora-violet-pcwallart_com.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>Ultraviolet light from the aurora (in optical windows but not visible to all humans) has been observed with the necessary equipment. The ultraviolet aurora has also been seen on Mars, Jupiter, and Saturn.</center>
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<center><strong>Infrared</strong></center>
<center>https://s26.postimg.org/7s8febiop/CSDCSCC.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>Infrared light, in the wavelength that is within the optical window, is also part of many auroras.</center>
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<center><strong>Yellow and Pink</strong></center>
<center>https://s26.postimg.org/fz50jmy55/CSDCSc.jpg</center>
<center><a href="https://www.nationalgeographic.org/encyclopedia/aurora/"><strong>Source</strong></a></center>
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<center>Yellow and pink is a mixture of red and green or blue. Other nuances of red and orange can be seen on rare occasions; yellow-green is quite common. Red, green, and blue are the primary colors of color additive synthesis, in practical theory every color is possible but the ones mentioned in this article consist of an almost complete list.</center>
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<center><strong>Aurora on Other Planets </strong></center>
<center>Aurora also occurs on other planets. Similar to the auroras of Earth, they are also seen close to the planet's magnetic pole. Aurora also occurs poles of the aurora zone either as a diffuse patch or arc, which can be sub-visual.</p>
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<center>https://s26.postimg.org/77xzpdeu1/U5dt_J7nq_XAa5_Luf_XF4xvwtfd_XWrn52s_1680x8400.jpg</center>
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