Volta Redonda vs Aurora

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Volta Redonda (Portuguese pronunciation: [ˈvɔwtɐ ʁeˈdõdɐ]) is the name of a municipality in the Rio de Janeiro state of Brazil with an area of 182.81 km², located from 350m to 707m above the sea level (22º31'23" S, 44º06'15" W) and with a population of 259,811 inhabitants (estimated in 2009). The area around the city has nearly 700,000 km². Its name (which is Portuguese for Round Turn) is due to the round shape of a curve in the Paraíba do Sul river around which the city was built. Situated in Volta Redonda is Companhia Siderurgica Nacional (CSN), Brazil's second largest steel producer. Today its economy, despite still being based on industry, is quite diverse, and largely focused on the areas of services and trade. Due to this, Volta Redonda is worldly known as Cidade do Aço (which is Portuguese for Steel City).

The city borders with the municipalities of Barra Mansa (north, northwest, west and southwest), Barra do Piraí (northeast), Pinheiral, Piraí (south and east), and Rio Claro (south) and is 130 km from the city of Rio de Janeiro. Along with the municipalities of Barra Mansa and Pinheiral, it is a conurbation of over 500,000 inhabitants, according to the IBGE estimates for 2008, and the state's largest urban spot outside the metropolitan region of Rio de Janeiro. Economical center of the South Fluminense region, Volta Redonda is a strategic area, close to major hub cities in other regional states, such as Juiz de Fora (190 kilometers) and Sao Jose dos Campos (220 kilometers).

Source: Wikipedia

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An aurora (plural: auroras or aurorae), sometimes referred to as polar lights (aurora polaris), northern lights (aurora borealis), or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras are the result of disturbances in the magnetosphere caused by solar wind. These disturbances are sometimes strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere).

The resulting ionization and excitation of atmospheric constituents emit light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.

Source: Wikipedia