It was not until the 1930s that Walter Grotrian and Bengt Edlén discovered that the spectral line at 530.3 nm was due to highly ionized iron (Fe13+); other unusual lines in the coronal spectrum were also caused by highly-charged ions, such as nickel, the high ionization being due to the extreme temperature of the solar corona.
Bengt-Åke Lundvall | Bengt Erland Fogelberg | Bengt af Klintberg | Bengt Nordén | Bengt Magnusson (Bjälboäten) | Bengt Lindroos | Bengt Lidner | Bengt Lidforss | Bengt Holgersson | Bengt Gabrielsson Oxenstierna | Bengt Edlén | Bengt |