rereh

Just another WordPress.com site

AURORA April 10, 2012

Filed under: Uncategorized — Rereh Yudi Harjadi @ 4:30 am

ImageImageImageImageImage

 

Image

Indahnya pemandangan langit seperti ini, serasa sedang berada di suatu tempat yang entah itu di Bumi atau Mars. (Ada juga ga yah di Mars?) Tapi emang bener kog, rasa-rasanya Aurora itu seperti sedang berada di suatu alam lain, karena efek tampilan langit yang begitu sempurna keindahannya.

Langsung ke: navigasi, cari
Untuk kegunaan lain dari Aurora, lihat Aurora (disambiguasi).

Aurora Borealis di atas Danau Bear, Alaska

Aurora adalah fenomena alam yang menyerupai pancaran cahaya yang menyala-nyala pada lapisan ionosfer dari sebuah planet sebagai akibat adanya interaksi antara medan magnetik yang dimiliki planet tersebut dengan partikel bermuatan yang dipancarkan oleh Matahari (angin surya).

Di bumi, aurora terjadi di daerah di sekitar kutub Utara dan kutub Selatan magnetiknya. Aurora yang terjadi di daerah sebelah Utara dikenal dengan nama Aurora Borealis (IPA /ɔˈɹɔɹə bɔɹiˈælɪs/), yang dinamai bersempena Dewi Fajar Rom, Aurora, dan nama Yunani untuk angin utara, Boreas. Ini karena di Eropa, aurora sering terlihat kemerah-merahan di ufuk utara seolah-olah Matahari akan terbit dari arah tersebut. Aurora borealis selalu terjadi di antara September dan Oktober dan Maret dan April. Fenomena aurora di sebelah Selatan yang dikenal dengan Aurora Australis mempunyai sifat-sifat yang serupa.Tapi kadang-kadang aurora muncul di puncak gunung di iklim tropis.ImageImage

Aurora Borealis” and “Aurora Australis” redirect here. For other uses, see Aurora Borealis (disambiguation) and Aurora Australis (disambiguation).

Pictures of the aurora australis

Images of the aurora australis and aurora borealis from around the world, including those with rarer blue and red lights

Picture of the aurora australis

Aurora australis 1994 from Bluff, New Zealand

Picture of the aurora

Aurora borealis 2012 from Kiruna, Sweden

An aurora (plural: aurorae or auroras) is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). The charged particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth’s magnetic field into the atmosphere. Aurora is classified as diffuse or discrete aurora. Most aurorae occur in a band known as the auroral zone[1][2] which is typically 3° to 6° in latitudinal extent and at all local times or longitudes. The auroral zone is typically 10° to 20° from the magnetic pole defined by the axis of the Earth’s magnetic dipole. During a geomagnetic storm, the auroral zone will expand to lower latitudes. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even on a dark night and defines the extent of the auroral zone. The discrete aurora are sharply defined features within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Discrete aurorae are usually observed only in the night sky because they are not as bright as the sunlit sky. Aurorae occur occasionally poleward of the auroral zone as diffuse patches[3] or arcs (polar cap arcs[4]) which are generally invisible to the naked eye.

In northern latitudes, the effect is known as the aurora borealis (or the northern lights), named after the Roman goddess of dawn, Aurora, and the Greek name for the north wind, Boreas, by Pierre Gassendi in 1621.[5] Auroras seen near the magnetic pole may be high overhead, but from farther away, they illuminate the northern horizon as a greenish glow or sometimes a faint red, as if the Sun were rising from an unusual direction. Discrete aurorae often display magnetic field lines or curtain-like structures, and can change within seconds or glow unchanging for hours, most often in fluorescent green. The aurora borealis most often occurs near the equinoctes. The northern lights have had a number of names throughout history. The Cree call this phenomenon the “Dance of the Spirits“. In Europe, in the Middle Ages, the auroras were commonly believed a sign from God.[6]

Its southern counterpart, the aurora australis (or the southern lights), has almost identical features to the aurora borealis and changes simultaneously with changes in the northern auroral zone [7] and is visible from high southern latitudes in Antarctica, South America, New Zealand and Australia.

Aurorae occur on other planets. Similar to the Earth’s aurora, they are visible close to the planet’s magnetic poles.ImageImage

Iklan
 

One Response to “AURORA”

  1. Reblogged this on rereh and commented:

    awesome


Tinggalkan Balasan

Isikan data di bawah atau klik salah satu ikon untuk log in:

Logo WordPress.com

You are commenting using your WordPress.com account. Logout /  Ubah )

Foto Google

You are commenting using your Google account. Logout /  Ubah )

Gambar Twitter

You are commenting using your Twitter account. Logout /  Ubah )

Foto Facebook

You are commenting using your Facebook account. Logout /  Ubah )

Connecting to %s