Everything about Hannes Alfv N totally explained
Hannes Olof Gösta Alfvén (
May 30,
1908;
Norrköping,
Sweden –
April 2,
1995;
Djursholm,
Sweden) was a
Swedish plasma physicist and
Nobel laureate for his work on the theory of
magnetohydrodynamics. He was originally trained as an electrical power engineer and later moved to research and teaching in the fields of plasma physics. 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.
Biography
In 1937, Alfvén argued that if
plasma pervaded the universe, it could then carry electric currents capable of generating a galactic magnetic field. After winning the Nobel Prize for his works in
magnetohydrodynamics, he emphasized that:
In order to understand the phenomena in a certain plasma region, it's necessary to map not only the magnetic but also the electric field and the electric currents. Space is filled with a network of currents which transfer energy and momentum over large or very large distances. The currents often pinch to filamentary or surface currents. The latter are likely to give space, as also interstellar and intergalactic space, a cellular structure.
His theoretical work on field-aligned electric currents in the aurora (based on earlier work by
Kristian Birkeland) was confirmed by satellite observations, in 1974, resulting in the discovery of
Birkeland currents.
Education
Alfvén received his PhD from the
University of Uppsala in 1934. His thesis was titled "Investigations of the Ultra-short Electromagnetic Waves."
Early years
In 1934, Alfvén taught
physics at both the
University of Uppsala and the
Nobel Institute for Physics in
Stockholm,
Sweden. In 1940, he became professor of electromagnetic theory and electrical measurements at the
Royal Institute of Technology in Stockholm. In 1945, he acquired the nonappointive position of Chair of Electronics. His title was changed to Chair of Plasma Physics in 1963. In 1954-1955, Alfvén was a Fulbright Scholar at the
University of Maryland, College Park. In 1967, after leaving Sweden and spending time in the
Soviet Union, he moved to the
United States. Alfvén worked in the departments of
electrical engineering at both the
University of California, San Diego and the
University of Southern California.
Alfvén considered himself an electrical engineer foremost. During his scientific career, prior to winning the
Nobel Prize, Alfvén wasn't generally recognized as a leading innovator in the scientific community (though they were using his work). He enjoyed the assertion that he was guilty of a fault or offence by the entry into areas not previously explored in
astrophysics leveled by other
cosmologists and
theoreticians.
Research, awards, and contributions
Alfvén's work was disputed for many years by the senior scientist in space physics, the
British-
American geophysicist Sydney Chapman. Alfvén's disagreements with Chapman stemmed in large part from trouble with the
peer review system. Alfvén rarely benefited from the acceptance generally afforded senior scientists in
scientific journals. He once submitted a paper on the theory of
magnetic storms and
auroras to the American journal
Terrestrial Magnetism and Atmospheric Electricity and his paper was rejected on the ground that it didn't agree with the theoretical calculations of conventional physics of the time. He was regarded as a person with
unorthodox opinions in the field by many physicists, R. H. Stuewer noting that "... he remained an embittered outsider, winning little respect from other scientists even after he received the Nobel Prize..." and was often forced to publish his papers in obscure journals. Alfvén recalled:
When I describe the [plasmaphenomena] according to this formulism most referees don't understand what I say and turn down my papers. With the referee system which rules US science today, this means that my papers are rarely accepted by the leading US journals.
He was awarded the
Nobel Prize in Physics in 1970 for his work with
magnetohydrodynamics (MHD). In 1988, Alfvén was awarded the
Bowie medal by the
American Geophysical Union for his work on
comets and
plasmas in the
solar system.
Awards
Alfvén was also awarded:
Memberships
Royal Swedish Academy of Sciences
Royal Swedish Academy of Engineering Sciences
Institute of Electrical and Electronics Engineers (life fellow)
European Physical Society
American Academy of Arts and Sciences
Yugoslav Academy of Sciences
Pugwash Conferences on Science and World Affairs
International Academy of Science
Alfvén was one of the few scientists who was a foreign member of both the United States and Soviet Academies of Sciences.
Research
Alfvén played a central role in the development of:
Plasma physics
Charged particle beams
Interplanetary physics
Magnetospheric physics
Magnetohydrodynamics
investigation (such as the solar wind)
Aurorae science
In 1939, Alfvén proposed the theory of magnetic storms and auroras and the theory of plasma dynamics in the earth's magnetosphere.
Applications of Alfvén's research in space science include:
Van Allen radiation belt theory
Reduction of the Earth's magnetic field during magnetic storms
Magnetosphere (protective plasma covering the earth)
Formation of comet tails
Formation of the solar system
Dynamics of plasmas in the galaxy
Fundamental nature of the universe
Alfvén's views followed those of the founder of magnetospheric physics, Kristian Birkeland. At the end of the nineteenth century, Birkeland proposed (backed by extensive data) that electric currents flowing down along the earth's magnetic fields into the atmosphere caused the aurora and polar magnetic disturbances.
Areas of technology benefiting from Alfvén's contributions include:
Particle beam accelerators
Controlled thermonuclear fusion
Hypersonic flight
Rocket propulsion
Reentry braking of space vehicles
Contributions to astrophysics:
Galactic magnetic field (1937)
Identified nonthermal synchrotron radiation from astronomical sources (1950)
Alfvén waves (low frequency hydromagnetic plasma oscillations) are named in his honor. Many of his theories about the solar system were verified as late as the 1980s through external measurements of cometary and planetary magnetospheres. But Alfvén himself noted that astrophysical textbooks poorly represented known plasma phenomena: A study of how a number of the most used textbooks in astrophysics treat important concepts such as double layers, critical velocity, pinch effects, and circuits is made. It is found that students using these textbooks remain essentially ignorant of even the existence of these concepts, despite the fact that some of them have been well known for half a century (e.g, double layers, Langmuir, 1929; pinch effect, Bennet, 1934).
Alfvén reported that of 17 of the most used textbooks on astrophysics, none mention the pinch effect, none mentioned critical ionization velocity, only two mentioned circuits, and three mentioned double layers.
Alfvén's cosmological model
Alfvén believed the problem with the Big Bang was that astrophysicists tried to extrapolate the origin of the universe from mathematical theories developed on the blackboard, rather than starting from known observable phenomena. He also considered the Big Bang to be a scientific myth devised to explain creation.
Alfvén and colleagues proposed the Alfvén-Klein model as an alternative cosmological theory to both the Big Bang and steady state theory cosmologies.
Later years
In 1991, Alfvén retired as professor of electrical engineering at the University of California, San Diego and professor of plasma physics at the Royal Institute of Technology in Stockholm.
Alfvén spent his adult life alternating between California and Sweden. He died at the age of 86.
The asteroid 1778 Alfvén was named in his honour.
Personal life
Alfvén had a good sense of humor and he participated in a variety of social issues and worldwide disarmament movements. He had a long-standing distrust of computers. Alfvén studied the history of science and oriental philosophy and religion. He spoke Swedish, English, German, French, and Russian, and some Spanish and Chinese.
Alfvén was married for 67 years to his wife Kirsten. They raised five children, one boy and four girls. His son became a physician, while one daughter became a writer and another a lawyer in Sweden. The composer Hugo Alfvén was Hannes Alfvén's uncle.
Bibliography
Full List
Cosmical Electrodynamics, International Series of Monographs on Physics, Oxford: Clarendon Press, 1950. (See also 2nd Ed. 1963, co-authored with Carl-Gunne Fälthammar)
Worlds-Antiworlds: Antimatter in Cosmology (1966)
The Great Computer: A Vision (1968) (a political-scientific satire under the pen name Olof Johannesson; publ. Gollancz, ISBN 05750-0059-7)
Atom, Man, and the Universe: A Long Chain of Complications (1969)
Living on the Third Planet (1972).
Cosmic Plasma, Astrophysics and Space Science Library, Vol. 82 (1981) Springer Verlag. ISBN 90-277-1151-8Further Information
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