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Storm‐time enhancement of mid‐latitude ultraviolet emissions due to energetic neutral atom precipitation
Author(s) -
DeMajistre R.,
Brandt P. C.,
Immel T. J.,
Yee J.H.,
Dalgarno A.,
Paxton L. J.,
Kharchenko V.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023059
Subject(s) - airglow , radiance , atmospheric sciences , electron precipitation , thermosphere , ultraviolet , brightness , latitude , physics , extreme ultraviolet , emission spectrum , geomagnetic storm , environmental science , altitude (triangle) , light emission , earth's magnetic field , ionosphere , magnetosphere , astronomy , spectral line , optics , plasma , laser , quantum mechanics , magnetic field , geometry , mathematics
In this work we present a direct connection between Energetic Neutral Atom (ENA) precipitation and enhanced ultraviolet emissions from the mid‐latitude thermosphere during times of geomagnetic disturbance. Data from the IMAGE/HENA instrument provides information about ENA emission from the ring current, the IMAGE/FUV instrument shows the temporal response of the ultraviolet airglow, and data from TIMED/GUVI is used to infer the vertical distribution of the airglow enhancement. We find that the airglow signature is well correlated with energetic atom precipitation. The ultraviolet emission has a maximum above 120 km tangent altitude and is dominated by OI 135.6 nm emission. The relative brightness of 135.6 nm emission and OI 130.4 nm radiance suggest a lack of an electron cascade.