Aurora vs Helsinki

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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

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Helsinki ( HEL-sink-ee or (listen) hel-SINK-ee; Finnish: [ˈhelsiŋki] (listen); Swedish: Helsingfors, Finland Swedish: [helsiŋˈforsː] (listen); Latin: Helsingia) is the capital, primate and most populous city of Finland. Located on the shore of the Gulf of Finland, It's the chair of the region of Uusimaa in southern Finland, and has a population of 656,229. The city's urban area has a population of 1,268,296, making it by far the most populous metropolitan area in Finland as well as the nation's most important center for politics, education, finance, culture, and research; while Tampere in the Pirkanmaa region, situated 179 kilometres (111 mi) to the north from Helsinki, is the second largest urban area in Finland. Helsinki is situated 80 kilometres (50 mi) north of Tallinn, Estonia, 400 kilometers (250 mi) east of Stockholm, Sweden, and 300 km (190 mi) west of Saint Petersburg, Russia. It has close historical ties with these 3 cities. Together with the cities of Espoo, Vantaa, and Kauniainen, and surrounding commuter cities, Helsinki creates the Greater Helsinki metropolitan area, which has a population of over 1.

5 million. Often considered to be Finland's only metropolis, it's the world's northernmost metro area with over one million individuals as well as the northernmost capital of an EU member state. After Stockholm and Oslo, Helsinki is the third largest municipality in the Nordic countries. Finnish and Swedish are both official languages. The city is served by the international Helsinki Airport, located in the neighboring city of Vantaa, with frequent service to many destinations in Europe and Asia. Helsinki was the World Design Capital for 2012, the venue for the 1952 Summer Olympics, and the host of the 52nd Eurovision Song Contest in 2007. Helsinki has among the world's highest urban standards of living. In 2011, the British magazine Monocle rated Helsinki the world's most liveable city in its liveable cities indicator. From the Economist Intelligence Unit's 2016 liveability survey, Helsinki was rated ninth among 140 cities.

Source: Wikipedia