In this section
@article{Rose:2017:mnras/stx3035,
author = {Rose, SJ and Keenan, FP and Poppenhaeger, K and Mathioudakis, M and Flowerdew, J and Hynes, D and Christian, DJ and Nilsen, J and Johnson, WR},
doi = {mnras/stx3035},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {3782--3786},
title = {X-ray line coincidence photopumping in a solar flare},
url = {http://dx.doi.org/10.1093/mnras/stx3035},
volume = {474},
year = {2017}
}
TY - JOUR
AB - Line coincidence photopumping is a process where the electrons of an atomic or molecular species are radiatively excited through the absorption of line emission from another species at a coincident wavelength. There are many instances of line coincidence photopumping in astrophysical sources at optical and ultraviolet wavelengths, with the most famous example being Bowen fluorescence (pumping of O III 303.80 Å by He II), but none to our knowledge in X-rays. However, here we report on a scheme where a He-like line of Ne IX at 11.000 Å is photopumped by He-like Na X at 11.003 Å, which predicts significant intensity enhancement in the Ne IX 82.76 Å transition under physical conditions found in solar flare plasmas. A comparison of our theoretical models with published X-ray observations of a solar flare obtained during a rocket flight provides evidence for line enhancement, with the measured degree of enhancement being consistent with that expected from theory, a truly surprising result. Observations of this enhancement during flares on stars other than the Sun would provide a powerful new diagnostic tool for determining the sizes of flare loops in these distant, spatially unresolved, astronomical sources.
AU - Rose,SJ
AU - Keenan,FP
AU - Poppenhaeger,K
AU - Mathioudakis,M
AU - Flowerdew,J
AU - Hynes,D
AU - Christian,DJ
AU - Nilsen,J
AU - Johnson,WR
DO - mnras/stx3035
EP - 3786
PY - 2017///
SN - 0035-8711
SP - 3782
TI - X-ray line coincidence photopumping in a solar flare
T2 - Monthly Notices of the Royal Astronomical Society
UR - http://dx.doi.org/10.1093/mnras/stx3035
UR - http://hdl.handle.net/10044/1/56091
VL - 474
ER -
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