Explanation Text about Aurora. Created for English Assignment.

2. GROUP 8
GeafiskaWidhar A. (11)
Kiki AudiyatulW. (15)
M. Lazuardi Nuriman (19)
Nuzulla Qori (23)

3. What is Aurora?

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

5. 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.

6. How do Auroras occur?

7. 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.

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

9. 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.

10. 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.

11. 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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