Alfvén Speed
Alfvén may refer to: People * Hannes Alfvén (1908–1995), Swedish plasma physicist and Nobel Prize in Physics laureate * Hugo Alfvén (1872–1960), Swedish composer, conductor, violinist, and painter * Marie Triepcke Krøyer Alfvén (1867–1940), commonly known as Marie Krøyer, Danish painter, wife of Hugo Other * Alfvén wave, a type of magnetohydrodynamic wave, named after Hannes Alfvén * 1778 Alfvén 1778 Alfvén, also designated , is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 26 September 1960, by astronomers Cornelis van Houten, Ingrid van Hou ...

Hannes Alfvén
Hannes Olof Gösta Alfvén (; 30 May 1908 – 2 April 1995) was a Swedish electrical engineer, plasma physicist and winner of the 1970 Nobel Prize in Physics for his work on magnetohydrodynamics (MHD). He described the class of MHD waves now known as Alfvén waves. He was originally trained as an electrical power engineer and later moved to research and teaching in the fields of plasma physics and electrical engineering. Alfvén made many contributions to plasma physics, including theories describing the behavior of aurorae, the Van Allen radiation belts, the effect of magnetic storms on the Earth's magnetic field, the terrestrial magnetosphere, and the dynamics of plasmas in the Milky Way galaxy. Education Alfvén received his PhD from the University of Uppsala in 1934. His thesis was titled "Investigations of High-frequency Electromagnetic Waves." Early years In 1934, Alfvén taught physics at both the University of Uppsala and the Nobel Institute for Physics (late ...
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Hugo Alfvén
Hugo Emil Alfvén (; 1 May 18728 May 1960) was a Swedish composer, conductor, violinist, and painter. Career Violinist Alfvén was born in Stockholm, Sweden, and studied at the Royal College of Music (Kungliga Musikhögskolan) from 1887 to 1891 with the violin as his main instrument while receiving lessons from Lars Zetterquist. He also took private composition lessons from Johan Lindegren, a leading counterpoint expert. At the same time he played the violin at the Royal Opera in Stockholm 1890-1892. Conductor Starting in 1897, Alfvén travelled much of the next ten years in Europe. He studied violin technique in Brussels with César Thomson and learned conducting in Dresden with Hermann Ludwig Kutzschbach. In 1903-4 he was formally professor of composition at the Royal Conservatory, Stockholm. From 1910 Alfvén was ''Director musices'' (music director) at the University of Uppsala (a post he held until 1939). There he also directed the male voice choir Orphei Drä ...
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Marie Triepcke Krøyer Alfvén
Marie may refer to: People Name * Marie (given name) * Marie (Japanese given name) * Marie (murder victim), girl who was killed in Florida after being pushed in front of a moving vehicle in 1973 * Marie (died 1759), an enslaved Cree person in Trois-Rivières, New France * ''Marie'', Biblical reference to Holy Mary, mother of Jesus * Marie Curie, scientist Surname * Jean Gabriel Marie (other) * Peter Marié (1826–1903), American socialite from New York City, philanthropist, and collector of rare books and miniatures * Rose Marie (1923–2017), American actress and singer * Teena Marie (1956–2010), American singer, songwriter, and producer Places * Marie, Alpes-Maritimes, commune of the Alpes-Maritimes department, France * Lake Marie, Umpqua Lighthouse State Park, Winchester Bay, Oregon, U.S. * Marie, Arkansas, U.S. * Marie, West Virginia, U.S. Art, entertainment, and media Music * "Marie" (Cat Mother and the All Night Newsboys song), 1969 * "Marie" (Johnny Hallyd ...
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Alfvén Wave
In plasma physics, an Alfvén wave, named after Hannes Alfvén, is a type of plasma wave in which ions oscillate in response to a restoring force provided by an effective tension on the magnetic field lines. Definition An Alfvén wave is a low-frequency (compared to the ion gyrofrequency) travelling oscillation of the ions and magnetic field in a plasma. The ion mass density provides the inertia and the magnetic field line tension provides the restoring force. Alfvén waves propagate in the direction of the magnetic field, and the motion of the ions and the perturbation of the magnetic field are transverse to the direction of propagation. However, Alfvén waves existing at oblique incidences will smoothly change into magnetosonic waves when the propagation is perpendicular to the magnetic field. Alfvén waves are dispersionless. Alfvén velocity The low-frequency relative permittivity \varepsilon of a magnetized plasma is given by : \varepsilon = 1 + \frac where is the ma ...
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