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Double dayside detached auroras: TIMED/GUVI observations
Author(s) -
Zhang Y.,
Paxton L. J.,
Meng C.I.,
Morrison D.,
Wolven B.,
Kil H.,
Christensen A. B.
Publication year - 2004
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 - 10.1029/2003gl018949
Subject(s) - physics , solar wind , ring current , proton , latitude , local time , astrophysics , geophysics , geology , atmospheric sciences , plasma , magnetosphere , astronomy , nuclear physics , statistics , mathematics
On August 19, 2003, TIMED/GUVI detected, for the first time, two separated (double) dayside detached auroras (D‐DDA) simultaneously in all the GUVI channels, 121.6 nm, 135.6 nm, LBHS, and LBHL. The D‐DDA was located at magnetic latitudes around −57° and −63° (L shell 3.4 and 4.9) in the 0900–1030 MLT region. The high‐latitude part of the D‐DDA is much brighter than the low‐latitude part. DMSP particle observation indicates that the source of the D‐DDA is energetic (∼10 keV) precipitating protons/electrons from the ring current due to the solar wind dynamic pressure enhancements [ Zhang et al. , 2002] and/or northward turning of the IMF B z . Observations of the D‐DDA provide the first single‐event evidence of multiple peaks in the statistical distribution of proton fluxes at energetic around and below 10 keV at low L‐shells [ Milillo et al. , 2001].