Name : Inayah Maghfirah R.
Class : XI MIA 1
Explanation Text : How Aurora Phenomena Happen
Do you know about aurora? Can you tell me how aurora occurs? Well, let me explain it. An
aurora (Latin word mean “sunrise”) is natural light display in the sky in the poles (north and
south) caused by the collision of energetic
charged particles with atoms in the high
altitude atmosphere. In the northern latitude,
the effect is known as aurora borealis (aurora:
the goddess dawn, borealis: north wind). While
in the Antarctic region, the effect is known as
aurora australis. They illuminate the northern
and southern horizon as greenish glow or
sometimes faint red, occasionally blue but most often in fluorescent green. Auroras can be seen
at night because their light is not as strong as the light of the day.
The aurora phenomenon occurs when the sun
produces solar wind. Solar wind is a stream of
electrons and protons which are released from the
sun due to the high kinetic energy. These particles
are charged and contain energy, which means
they contribute to electricity. In other way, our
planet is surrounded by a super-sized magnetic
sheath which is usually called the Magnetic Field
of the Earth. Sometimes this solar wind hits the
Earth. Some of these charged particles lead to the poles of the earth at a speed that keeps
growing. The collision between these particles and atoms present in the earth’s atmosphere, it
releases the energy that causes the formation of colorful auroras at the poles of the earth,
which looks like a big circle around the pole.
Why Aurora is only found in the earth’s poles? This is because the north and South Pole
magnetic field is very strong compared to other regions. The poles of this magnetic field pull
the protons and electrons from the solar wind. So the phenomenon is more common in the
Polar Regions.
However, sometimes the Aurora can also appear at the top of the mountain in a tropical
climate, but this phenomenon is extremely rare. Aurora phenomena have been observed on
other planets than Earth that have a magnetic field, such as Jupiter, Saturn and more recently
Mars. It is believed to be a widespread phenomenon in the Solar System and beyond.