Explanation Text - Aurora

GROUP 8

Geafiska Widhar A. (11)

Kiki Audiyatul W. (15)

M. Lazuardi Nuriman (19)

Nuzulla Qori (23)

What is Aurora?

A natural light display in the sky, predominantly seen in the high latitude (Arctic and Antartic) regions.

What cause Auroras?

Charged particles, mainly electrons and protons, entering the

atmosphere from above causing ionisation and excitation of atmospheric

contituens, and consequent optical

emissions.

How do Auroras occur?

Most auroras occur in a band known as the auroral zone, which is typically 3° to 6° wide in latitude and between 10°and 20° from the geomagnetic poles at all local times (or longitudes), but most clearly seen at night against a dark

sky.

A geomagnetic storm causes the auroral ovals (north and south) to expand, and bring the aurora to

lower latitudes.

In northern latitudes, the effect is known as the aurora borealis(or the northern lights).

Auroras seen within the auroral oval may be directly overhead, but from farther away, they illuminate the poleward horizon as

a greenish glow or sometimes a faint red, as if the Sun were rising from an unusual direction.

Its southern counterpart, the aurora australis (or the southern lights), has features that are almost identical to the aurora borealis and changes simultaneously with changes in the

northern auroral zone. It is visible from high southern latitudes in Antarctica, South

America, New Zealand, and Australia.

Auroras occur on other planets. Similar to the Earth's aurora, they are also visible close to the planet's magnetic poles. Auroras also occur poleward of the auroral zone as either diffuse patches or arcs, which can be sub-visual.

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