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Rödkallen
Rödkallen is a small uninhabited (summer cabins are in use) Swedish island and lighthouse station located in the Bothnian Bay in the south part of Luleå archipelago. The island was used by fishermen a long time before the lighthouse was built. In 1800 a chapel was built for the fishermen and it survives to this day. Lighthouse The lighthouse was constructed after Nils Gustaf von Heidenstam's skeletal iron design. Originally it carried a colza oil lamp which was changed to a kerosene lamp 1884. In 1936 a small electric plant was built on the island which was used by the lighthouse. After one hundred years in service the old lighthouse was deactivated in favor of the small modern Rödkallen södra (''south'') light on the roof of a pilot station. The tall building has a yellow and red daymark. The station was closed down in 1981. A small hotel was started in the building in 2000, but it was closed in 2008. The old lighthouse is preserved and its large lens still mounted, covered w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bothnian Bay
The Bothnian Bay or Bay of Bothnia (; ) is the northernmost part of the Gulf of Bothnia, which is in turn the northern part of the Baltic Sea. The land holding the bay is still rising after the weight of ice-age glaciers has been removed, and within 2,000 years the bay will be a large freshwater lake since its link to the south Kvarken is mostly less than deep. The bay today is fed by several large rivers, and is relatively unaffected by tides, so has low salinity. It freezes each year for up to six months. Compared to other parts of the Baltic it has little plant or animal life. Extent The bay is divided from the Bothnian Sea, the southern part of the Gulf of Bothnia, by the Northern Quark (Kvarken) strait. The Northern Quark has a greatest depth of , with two ridges that are just deep. It lies between a group of islands off Vaasa in Finland and another group at Holmöarna in Sweden. The bay is bounded by Finland to the east and Sweden to the west. The bay is asymmetric, wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lighthouses And Lightvessels In Sweden
This is a list of lighthouses and lightvessels in Sweden. Lightvessels *Almagrundet * Old Finngrundet lightvessel, now a museum ship * Fladen Lighthouses * Agö, Hälsingland * Bergudden, Västerbotten * Bjuröklubb, Västerbotten *Brämön, Ångermanland *Bönan, Gästrikland *Djursten, Uppland * Eggegrund, Gästrikland *Falsterbo Lighthouse, Skåne * Falsterborev, Skåne * Faludden, Gotland * Finngrundet, Uppland * Fårö Lighthouse, Gotland * Garpen, Småland *Gotska Sandön, Gotland * Grundkallen, Uppland * Grönskär, Södermanland * Gåsören, Västerbotten * Hallands Väderö, Skåne *Hanö, Blekinge *Hoburgen, Gotland * Holmögadd, Ångermanland *Huvudskär, Södermanland * Hållö, Bohuslän * Häradskär, Östergötland * Hätteberget, Bohuslän * Högbonden, Ångermanland * Högby Lighthouse, Öland * Kapelludden, Öland *Kullen Lighthouse, Kullaberg, Skåne *Landsort, Södermanland * Lungö, Ångermanland * Långe Erik, Öland *Långe Jan, Öland *Malören, Norrbot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parabolic Mirror
A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave travelling along the axis into a spherical wave converging toward the focus. Conversely, a spherical wave generated by a point source placed in the focus is reflected into a plane wave propagating as a collimated beam along the axis. Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming star light). Since the principles of reflection are reversible, parabolic reflectors can also be used to collimate radiation from an isotropic source into a parallel beam. In optics, parabolic mirrors are used to gather light in reflecting telescopes and solar furnaces, and project a beam of light in flashl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seasonal Lag
Seasonal lag is the phenomenon whereby the date of maximum average air temperature at a geographical location on a planet is delayed until some time after the date of maximum insolation (i.e. the summer solstice). This also applies to the minimum temperature being delayed until some time after the date of minimum insolation. In most Northern Hemisphere regions, the month of February is usually colder than the month of November despite February having significantly later sunsets and more daylight overall. Conversely, the month of August is usually hotter than the month of May despite August having later sunrises, increasingly earlier sunsets, and less daylight overall. In all cases, the change in average air temperature lags behind the more consistent change in daylight patternsdelaying the perceived start of the next season for a month or so. An analogous temperature lag phenomenon occurs in diurnal temperature variation, where maximum daily temperature occurs after noon (maximu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buildings And Structures In Norrbotten County
A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, land prices, ground conditions, specific uses, prestige, and aesthetic reasons. To better understand the term ''building'' compare the list of nonbuilding structures. Buildings serve several societal needs – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work. A building as a shelter represents a physical division of the human habitat (a place of comfort and safety) and the ''outside'' (a place that at times may be harsh and harmful). Ever since the first cave paintings, buildings have also become objects or canvasses of much artistic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses In Sweden
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and has become uneconomical since the advent of much cheaper, more sophisticated and effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swedish Islands In The Baltic
Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by the Swedish language * Swedish people or Swedes, persons with a Swedish ancestral or ethnic identity ** A national or citizen of Sweden, see demographics of Sweden ** Culture of Sweden * Swedish cuisine See also * * Swedish Church (other) * Swedish Institute (other) * Swedish invasion (other) * Swedish Open (other) {{disambig Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Islands Of Norrbotten County
An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. Sedimentary islands in the Ganges delta are called chars. A grouping of geographically or geologically related islands, such as the Philippines, is referred to as an archipelago. There are two main types of islands in the sea: continental and oceanic. There are also artificial islands, which are man-made. Etymology The word ''island'' derives from Middle English ''iland'', from Old English ''igland'' (from ''ig'' or ''ieg'', similarly meaning 'island' when used independently, and -land carrying its contemporary meaning; cf. Dutch ''eiland'' ("island"), German ''Eiland'' ("small island")). However, the spelling of the w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uninhabited Islands Of Sweden
The list of uninhabited regions includes a number of places around the globe. The list changes year over year as human beings migrate into formerly uninhabited regions, or migrate out of formerly inhabited regions. List As a group, the list of uninhabited places are called the "nonecumene". This is a special geography term which means the uninhabited area of the world. * Virtually all of the Ocean *Virtually all of Antarctica *Most of The Arctic *Most of Greenland *Most of The Sahara * Antipodes Islands * Ashmore and Cartier Islands * Bajo Nuevo Bank * Baker Island * Ball's Pyramid * Balleny Islands * Big Major Cay * Bouvet Island * Much of the interior of Brazil * Caroline Island * Clipperton Island * The semi-arid regions and deserts of Australia * Devon Island * Much of Eastern Oregon * Elephant Island * Elobey Chico * Ernst Thälmann Island * Much of Fiordland, New Zealand * Goa Island * Gough Island * Hans Island * Harmil * Hashima Island * Hatutu * Heard Island ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luleå
Luleå ( , , locally ; smj, Luleju; fi, Luulaja) is a city on the coast of northern Sweden, and the capital of Norrbotten County, the northernmost county in Sweden. Luleå has 48,728 inhabitants in its urban core (2018) and is the seat of Luleå Municipality (with a total population of 77,832). Luleå is Sweden's 25th largest city and Norrbotten County's largest city. Luleå has the seventh biggest harbour in Sweden for shipping goods. It has a large steel industry and is a centre for extensive research. It is also home to the Swedish Air Force Wing Norrbotten Wing (F 21) based in Luleå Airport. Luleå University of Technology is one of Sweden's three technology universities (the other two are KTH and Chalmers) and the northernmost university in Sweden. The university has approximately 15,000 students. History The town's Royal charter was granted in 1621 by King Gustavus Adolphus of Sweden. The original town was situated where Gammelstad (Old Town) is situated today ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cold Wave
A cold wave (known in some regions as a cold snap, cold spell or Arctic Snap) is a weather phenomenon that is distinguished by a cooling of the air. Specifically, as used by the U.S. National Weather Service, a cold wave is a rapid fall in temperature within a 24-hour period requiring substantially increased protection to agriculture, industry, commerce, and social activities. The precise criteria for a cold wave are the rate at which the temperature falls, and the minimum to which it falls. This minimum temperature is dependent on the geographical region and time of year. In the United States, a ''cold spell'' is defined as the national average high temperature dropping below . A cold wave of sufficient magnitude and duration may be classified as a cold air outbreak (CAO). Effects A cold wave can cause death and injury to livestock and wildlife. Exposure to cold mandates greater caloric intake for all animals, including humans, and if a cold wave is accompanied by heavy and p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diurnal Temperature Variation
In meteorology, diurnal temperature variation is the variation between a high air temperature and a low temperature that occurs during the same day. Temperature lag Temperature lag is an important factor in diurnal temperature variation: peak daily temperature generally occurs ''after'' noon, as air keeps net absorbing heat even after noon, and similarly minimum daily temperature generally occurs substantially after midnight, indeed occurring during early morning in the hour around dawn, since heat is lost all night long. The analogous annual phenomenon is seasonal lag. As solar energy strikes the Earth's surface each morning, a shallow layer of air directly above the ground is heated by conduction. Heat exchange between this shallow layer of warm air and the cooler air above is very inefficient. On a warm summer's day, for example, air temperatures may vary by from just above the ground to waist height. Incoming solar radiation exceeds outgoing heat energy for many hours afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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