Churchill, Manitoba is a small town in northern Manitoba on the shores of the Hudson Bay. The town is the Polar Bear Capital of the World (sightings are year round), Baluga Whale Capital of the World (sightings from late June to late August), and one of the best places to see an Aurora Borealis or Northern-Lights (sightings from late November through to late March). No-one ever forgets a visit to Churchill its the best place to connect to mother natures many wonders.
Folklore abounds with explanations of the origins of the spellbinding celestial lights. In Finnish they are called "revontulet", which means "fox fires" a name derived from an ancient fable of the arctic fox starting fires fire or spraying up snow with its brush-like tail. No matter that in English "foxfire" is a luminescent glow emitted by certain types of fungi growing on rotten wood. The true story is that the sun is the father of the auroras.
The sun gives off high-energy charged particles (also called ions) that travel out into space at speeds of 300 to 1200 kilometres per second. A cloud of such particles is called a plasma. The stream of plasma coming from the sun is known as the solar wind. As the solar wind interacts with the edge of the earth's magnetic field, some of the particles are trapped by it and they follow the lines of magnetic force down into the ionosphere, the section of the earth's atmosphere that extends from about 60 to 600 kilometres above the earth's surface. When the particles collide with the gases in the ionosphere they start to glow, producing the spectacle that we know as the auroras, northern and southern. The array of colours consists of red, green, blue and violet.
The Northern Lights are constantly in motion because of the changing interaction between the solar wind and the earth's magnetic field. The solar wind commonly generates up to 1000,000 megawatts of electricity in an auroral display and this can cause interference with power lines, radio and television broadcasts and satellite communications. By studying the auroras, scientists can learn more about the solar wind, how it affects the earth's atmosphere and how the energy of the auroras might be exploited for useful purposes.
