Physics
Scientific paper
Aug 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.207..737a&link_type=abstract
Nature, Volume 207, Issue 4998, pp. 737-738 (1965).
Physics
11
Scientific paper
ATOMS bombarded by energetic electrons may experience ionization through the loss of a K-shell electron. Part of the subsequent rearrangement of the ion to its ground-state involves the movement of an outer (usually an L- or M-shell) electron to fill the K-shell vacancy. The energy released in this transition appears in one of two forms. Either a photon is emitted (characteristic radiation) or one or more outer electrons are expelled from the ion (the Auger process). The purpose of this communication is to point out thatcharacteristic X-rays emitted as a result of such inner-electron transitions may make an important contribution to the X-ray emission of solar flares. It is not yet known with certainty whether the radiation from flares in the λλ 1-3 Å region is predominantly of thermal1,2 or non-thermal3 origin. The detection of the characteristic radiation of iron atoms in the X-radiation from flares would indicate that non-thermal processes are important in the production of X-rays in this wavelength range.
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