Question: How are auroras created?
About the article "Aurora", section "Auroral mechanism".

Candidate passages:
An auroral chorus is a series of electromagnetic wave/s at frequencies which resemble chirps, whistles, and quasi-musical sounds in predominantly rising tones when played as pressure waves (sound), which are created by geomagnetic storms also responsible for the auroras.
The electromagnetic waves are a type of Natural radio waves, vibrations of electric and magnetic energy occurring at the same frequency as sound. 
Auroras occur on Mars, but they do not occur at the poles as on Earth, because Mars has no planetwide magnetic field.
Rather, they occur near magnetic anomalies in Mars's crust, which are remnants from earlier days when Mars did have a magnetic field.
Martian auroras are a distinct kind not seen elsewhere in the solar system.
They would probably also be invisible to the human eye, being largely ultraviolet phenomena. 
Intense columns of Auroral ionization at 100 km altitudes within the auroral oval backscatter radio waves, perhaps most notably on HF and VHF.
Backscatter is angle-sensitive—incident ray vs. magnetic field line of the column must be very close to right-angle.
Random motions of electrons spiraling around the field lines create a Doppler-spread that broadens the spectra of the emission to more or less noise-like—depending on how high radio frequency is used.
The radio-auroras are observed mostly at high latitudes and rarely extend down to middle latitudes.
The occurrence of radio-auroras depends on solar activity (flares, coronal holes, CMEs) and annually the events are more numerous during solar cycle maxima.
Radio aurora includes the so-called afternoon radio aurora which produces stronger but more distorted signals and after the Harang-minima, the late-night radio aurora (sub-storming phase) returns with variable signal strength and lesser doppler spread.
The propagation range for this predominantly back-scatter mode extends up to about 2000 km in east-west plane, but strongest signals are observed most frequently from the north at nearby sites on same latitudes.
Rarely, a strong radio-aurora is followed by Auroral-E, which resembles both propagation types in some ways. 
AuroraMAX is a project which monitors and presents images of auroras seen from Yellowknife (Northwest Territories, Canada).
This project allows to amateur astronomers to watch auroras up to and during the solar maximum in 2013.
AuroraMAX is available only in French and in English.
Auroras are natural exhibition of lights that can be seen by the naked eyes.
Auroras happen when protons and electrons or charged particles and gases in the Earth's atmosphere crash into each other, creating tiny flares of light that decorate the sky with colorful light.
Billions of these tiny flares occur in sequence causing the lights to seem like they are dancing or moving.
The lights in the Northern hemisphere are Aurora Borealis or simply The Northern Lights while the lights in the Southern hemisphere are called Aurora Australis or simply The Southern Lights.
Amateur astronomers can see auroras online and live, through the AuroraMAX Online Observatory.
The project is a collaboration between the University of Calgary, the Canadian Space Agency, the society Astronomy North, and the city of Yellowknife. 
 "Walls Is Auroras" at Nippon Budokan