Ion Television | Ion Iliescu | Ion | Charged GBH | The Seven Habits of Highly Effective People | Ion Creangă | Ion Birch | Lithium-ion battery | Ion Voicu | Ion Nunweiller | Ion (mythology) | Ion Antonescu | ION Television | Ion Panţuru | Ion Mihalache | Ion Idriess | Ion exchange | Ion Baciu | Voltage-gated ion channel | Saturn Ion | Relativistic Heavy Ion Collider | lithium-ion battery | Ion Vincze | Ion Tower | Ion Storm | Ion Sancho (politician) | Ion Sancho | Ion (play) | Ion Perdicaris | Ion Păscăluţă |
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.