Aurora Polaris by Marta Lozano Molano
Scoring: Flute, Clarinet, Piano, Violín, Viola
Aurora Polaris (or “aurora borealis” in the northern hemisphere and “australis” in the southern hemisphere) is a magnificent and spectacular light phenomenon. This named was given in honour of the Roman goddess of dawn Aurora. It is also well knows as «Northern Lights”.
Auroras are formed when a solar mass ejection collides with north and south poles of the Earth’s magnetosphere. As a consequence a diffused light is projected onto the Earth’s ionosphere, consisting of proton particles that spread colour.
Northern lights have different forms, structures and colours that evolve and change constantly. Some times they form “quiet arcs” in the firmament. Aurora normally appears either as a diffuse glow or as “curtains” (many parallel rays) of colours that extend in east-west direction.
Formation process consists in an isolated elongated arc at the beginning of the night. It increases its brilliance as time goes by and the arc changes its form into waves and loops. Then the whole firmament is full of trembling spirals, bands and rays of light that move very fast from horizon to horizon. This phenomenon can last hours or just a few minutes. Then the process decelerates and dawn comes.
Ensemble Sonido Extremo V Ciclo de Música Actual-Temporada FAIC, Sociedad Filarmónica de Badajoz 11-Diciembre-2013