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Solar Variation
The Solar cycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a periodic 11-year change in the Sun's activity measured in terms of variations in the number of observed sunspots on the Sun's surface. Over the period of a solar cycle, levels of solar radiation and ejection of solar material, the number and size of sunspots, solar flares, and coronal loops all exhibit a synchronized fluctuation from a period of minimum activity to a period of a maximum activity back to a period of minimum activity. The magnetic field of the Sun flips during each solar cycle, with the flip occurring when the solar cycle is near its maximum. After two solar cycles, the Sun's magnetic field returns to its original state, completing what is known as a Hale cycle. This cycle has been observed for centuries by changes in the Sun's appearance and by terrestrial phenomena such as aurora but was not clearly identified until 1843. Solar activity, driven by b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunspot Numbers
Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area. They are one of the most recognizable Solar phenomena and despite the fact that they are mostly visible in the solar photosphere they usually affect the entire solar atmosphere. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle. Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from to . Larger sunspots can be visible from Earth without the aid of a telescope. They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge. Indicating intense magnetic activi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Minimum
Solar minimum is the regular period of least solar activity in the Sun's 11-year solar cycle. During solar minimum, sunspot and solar flare activity diminishes, and often does not occur for days at a time. On average, the solar cycle takes about 11 years to go from one solar minimum to the next, with duration observed varying from 9 to 14 years. The date of the minimum is described by a smoothed average over 12 months of sunspot activity, so identifying the date of the solar minimum usually can only happen 6 months after the minimum takes place. Solar minimum is contrasted with the solar maximum, when hundreds of sunspots may occur. Solar minimum and solar maximum Solar minima and maxima are the two extremes of the Sun's 11-year and 400-year activity cycle. At a maximum, the Sun is peppered with sunspots, solar flares erupt, and the Sun hurls billion-ton clouds of electrified gas into space. Sky watchers may see more auroras, and space agencies must monitor radiation storms for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Walter Maunder
Edward Walter Maunder (12 April 1851 – 21 March 1928) was a British astronomer. His study of sunspots and the solar magnetic cycle led to his identification of the period from 1645 to 1715 that is now known as the Maunder Minimum. Early and personal life Maunder was born in 1851, in London, the youngest child of a minister of the Wesleyan Society. He attended King's College London but never graduated. He took a job in a London bank to finance his studies. In 1873 Maunder returned to the Royal Observatory, taking a position as a spectroscopic assistant. Shortly after, in 1875, he married Edith Hannah Bustin, who gave birth to six children: four sons (one of whom died in infancy) and two daughters. Following the death of Edith in 1888, in 1890 he met Annie Scott Dill Russell (later Annie Russell Maunder), a mathematician and astronomer educated at Girton College in Cambridge, with whom he collaborated for the remainder of his life. She worked as a " lady computer" at the Obs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annie S
Annie may refer to: People and fictional characters * Annie (given name), a given name and a list of people and fictional characters with the name * Annie (Malayalam actress) (born 1975), Indian actress who works in Malayalam-language films * Annie (Telugu actress) (born 2001), Indian actress who works in Telugu-language films * Annie (singer) (born 1977), Norwegian singer Theatre and film * ''Annie'' (musical), a 1977 musical ** ''Annie'' (1982 film) *** ''Annie'' (1982 film soundtrack) *** '' Annie: A Royal Adventure!'', a 1995 telefilm sequel ** ''Annie'' (1999 film) *** ''Annie'' (1999 film soundtrack) ** ''Annie'' (2014 film) *** ''Annie'' (2014 film soundtrack) * ''Annie'' (1976 film), a British-Italian film Music * ''Annie'' (Anne Murray album) (1972) * "Annie" (song), a 1999 song by Our Lady Peace * "Annie", a song by SafetySuit * "Annie", a song by Pete Townshend from '' Rough Mix'' * "Annie", a 1972 song by Sutherland Brothers * "Annie", a 1995 song by E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustav Spörer
Friederich Wilhelm Gustav Spörer (23 October 1822 – 7 July 1895) was a German astronomer. He is noted for his studies of sunspots and sunspot cycles. In this regard he is often mentioned together with Edward Maunder. Spörer was the first to note a prolonged period of low sunspot activity from 1645 to 1715. This period is known as the Maunder Minimum. Spörer was a contemporary of Richard Christopher Carrington, an English astronomer. Carrington is generally credited with discovering Spörer's law, which governs the variation of sunspot latitudes during the course of a solar cycle. Spörer added to Carrington's observations of sunspot drift and is sometimes credited with the discovery. The Spörer minimum was a period of low sunspot activity from roughly 1420 to 1570. Life From 1833 to 1840 Spörer attended Friedrich Wilhelm Gymnasium (Berlin), Friedrich-Wilhelms-Gymnasium in Berlin and afterwards studied mathematics and natural history at Humboldt University of Berlin, Ber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolf Number
The Wolf number (also known as the relative sunspot number or Zürich number) is a quantity that measures the number of sunspots and groups of sunspots present on the surface of the Sun. Historically, it was only possible to detect sunspots on the far side of the Sun indirectly using helioseismology. Since 2006, NASA's STEREO spacecrafts allow their direct observation. History Astronomers have been observing the Sun recording information about sunspots since the advent of the telescope in 1609. However, the idea of compiling the information about the sunspot number from various observers originates in Rudolf Wolf in 1848 in Zürich, Switzerland. The produced series initially had his name, but now it is more commonly referred to as the international sunspot number series. The international sunspot number series is still being produced today at the observatory of Brussels. The international number series shows an approximate periodicity of 11 years, the solar cycle, which was f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Heinrich Schwabe
Samuel Heinrich Schwabe (25 October 1789 – 11 April 1875) was a German amateur astronomer remembered for his work on sunspots. He observed sunspots and made drawings of them from 1825 to 1867 and suggested in 1838 that there may be a ten-year cycle of sunspot activity. He also took an interest in botany and was a founding member of a natural history society in Dessau. Life and work Schwabe was born in Dessau, Germany, where his father was a physician to the duke. His mother was the daughter of apothecary Johann H. G. Häseler (1740-1812) and he too trained to be one in 1806 by joining the Dessau Mohrenapotheke owned by Häseler. After about three years he began to study at the University of Berlin training in pharmacy under Martin Heinrich Klaproth and Sigismund Friedrich Hermbstädt. He also took an interest in astronomy and botany and was forced to stop studies when his grandfather Häseler fell ill. After the death of Häseler in 1812, Schwabe was forced to take over the fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Physics (journal)
''Solar Physics'' is a Peer review, peer-reviewed scientific journal published monthly by Springer Science+Business Media. The editors-in-chief are Lidia van Driel-Gesztelyi (various affiliations), Cristina Mandrini (Universidad de Buenos Aires), Iñigo Arregui (Instituto de Astrofísica de Canarias), and Marco Velli. Scope and history The focus of this journal is fundamental research on the Sun and it covers all aspects of solar physics. Topical coverage includes solar-terrestrial physics and stellar research if it pertains to the focus of this journal. Publishing formats include regular manuscripts, invited reviews, invited memoirs, and topical collections. ''Solar Physics'' was established in 1967 by solar physicists Cornelis de Jager and Zdeněk Švestka, and publisher D. Reidel. Abstracting and indexing This journal is indexed by the following services: * Science Citation Index * Scopus * INSPEC * Chemical Abstracts Service * Current Contents/Physical, Chemical & Earth Sci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denmark
Denmark is a Nordic countries, Nordic country in Northern Europe. It is the metropole and most populous constituent of the Kingdom of Denmark,, . also known as the Danish Realm, a constitutionally unitary state that includes the Autonomous administrative division, autonomous territories of the Faroe Islands and Greenland in the north Atlantic Ocean.* * * Metropolitan Denmark, also called "continental Denmark" or "Denmark proper", consists of the northern Jutland peninsula and an archipelago of 406 islands. It is the southernmost of the Scandinavian countries, lying southwest of Sweden, south of Norway, and north of Germany, with which it shares a short border. Denmark proper is situated between the North Sea to the west and the Baltic Sea to the east.The island of Bornholm is offset to the east of the rest of the country, in the Baltic Sea. The Kingdom of Denmark, including the Faroe Islands and Greenland, has roughly List of islands of Denmark, 1,400 islands greater than in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copenhagen
Copenhagen ( ) is the capital and most populous city of Denmark, with a population of 1.4 million in the Urban area of Copenhagen, urban area. The city is situated on the islands of Zealand and Amager, separated from Malmö, Sweden, by the Øresund strait. The Øresund Bridge connects the two cities by rail and road. Originally a Vikings, Viking fishing village established in the 10th century in the vicinity of what is now Gammel Strand, Copenhagen became the capital of Denmark in the early 15th century. During the 16th century, the city served as the ''de facto'' capital of the Kalmar Union and the seat of the Union's monarchy, which governed most of the modern-day Nordic countries, Nordic region as part of a Danish confederation with Sweden and Norway. The city flourished as the cultural and economic centre of Scandinavia during the Renaissance. By the 17th century, it had become a regional centre of power, serving as the heart of the Danish government and Military history ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rundetaarn
The Round Tower () is a 17th-century tower in Copenhagen, Denmark, one of the many architectural projects of Christian IV of Denmark, Christian IV. Built as an astronomical observatory, it is noted for its equestrian staircase, a 7.5-turn helical corridor leading to the platform at the top (34.8 meters above ground), and its views over Copenhagen. The tower is part of the ''Trinitatis Complex'' which also includes a chapel, the Trinitatis Church, and an academic library, which were the first facilities of the Copenhagen University Library founded in 1482. History Background Astronomy had grown in importance in 17th-century Europe. Countries had begun competing with each other in establishing colonies, creating a need for accurate navigation across the oceans. Many national observatories were therefore established, the first in 1632 at Leiden in the Dutch Republic. Only five years later the Round Tower Observatory, first referred to as STELLÆBURGI REGII HAUNIENSIS, would follow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
