Bengt Edlén (2 November 1906, Gusum – 10 February 1993, Lund) was a Swedish professor of physics and astronomer who specialized in

spectroscopy Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter ...

. He was the first who identified the unknown coronal spectral lines in the Corona, which was used to calculate the temperature of the corona.

Biography

Bengt Edlén was born on 2 November 1906 in

Gusum Gusum is a locality situated in Valdemarsvik Municipality, Östergötland County, Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the King ...

, Sweden. He graduated from high school in

Norrköping Norrköping (; ) is a city in the province of Östergötland in eastern Sweden and the seat of Norrköping Municipality, Östergötland County, about 160 km southwest of the national capital Stockholm, 40 km east of county seat Link� ...

in 1926 and entered the

University of Uppsala Uppsala University ( sv, Uppsala universitet) is a public research university in Uppsala, Sweden. Founded in 1477, it is the oldest university in Sweden and the Nordic countries still in operation. The university rose to significance durin ...

the same year. He was awarded his

bachelor's degree A bachelor's degree (from Middle Latin ''baccalaureus'') or baccalaureate (from Modern Latin ''baccalaureatus'') is an undergraduate academic degree awarded by colleges and universities upon completion of a course of study lasting three to six ...

after three semester and graduated with a PhD in 1934 with his thesis about the spectra and energy of the elements in the beginning of the periodic system. He received international fame after finding unidentified spectral lines in the Sun's

spectrum A spectrum (plural ''spectra'' or ''spectrums'') is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. The word was first used scientifically in optics to describe the rainbow of color ...

which were speculatively believed to originate from a hitherto unidentified

chemical element A chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species. Unlike chemical compounds, chemical elements cannot be broken down into simpler sub ...

termed

coronium Coronium, also called newtonium, was the name of a suggested chemical element, hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887. A new atomic thin green line in the solar corona was then co ...

. Edlén later showed that those lines are from multiply ionized iron (Fe-XIV). His discovery was not immediately accepted, since the alleged ionization required a temperature of millions of degrees. Later such

solar corona A corona ( coronas or coronae) is the outermost layer of a star's atmosphere. It consists of plasma. The Sun's corona lies above the chromosphere and extends millions of kilometres into outer space. It is most easily seen during a total sola ...

temperatures were verified. He also made an important contribution in analyzing spectra of

Wolf–Rayet star Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface ...

s. Edlén was professor at

Lund University , motto = Ad utrumque , mottoeng = Prepared for both , established = , type = Public research university , budget = SEK 9 billion Royal Swedish Academy of Sciences in 1947. He received the Gold Medal of the

Royal Astronomical Society (Whatever shines should be observed) , predecessor = , successor = , formation = , founder = , extinction = , merger = , merged = , type = NG ...

1945 for the solution of the Corona Mystery, the Howard N. Potts Medal in 1946 for researches in the extreme ultraviolet, and the

Henry Draper Medal The Henry Draper Medal is awarded every 4 years by the United States National Academy of Sciences "for investigations in astronomical physics". Named after Henry Draper, the medal is awarded with a gift of USD $15,000. The medal was established ...

of the

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nat ...

in 1968.

References

External links

Gold Medal of the Royal Astronomical Society awarded to Edlén

(in Swedish) {{DEFAULTSORT:Edlen, Bengt 1906 births 1993 deaths 20th-century Swedish astronomers Swedish physicists Lund University faculty Members of the Royal Swedish Academy of Sciences Recipients of the Gold Medal of the Royal Astronomical Society Howard N. Potts Medal recipients