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Dayside convection aligned auroral arcs
Author(s) -
Zhang Y.,
Paxton L. J.
Publication year - 2006
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 - 10.1029/2006gl026388
Subject(s) - convection , geophysics , geology , ionosphere , solar wind , high latitude , ring current , proton , latitude , physics , atmospheric sciences , magnetosphere , plasma , meteorology , geodesy , quantum mechanics
TIMED GUVI and IMAGE FUV observed a new phenomenon: Dayside Convection Aligned Auroral Arcs (DCAA) under conditions of high solar wind speed/dynamic pressure, and magnetic activity. The DCAA is observed near the dayside ionospheric convection throat and aligned with the convection direction. All the data suggest that DCAA is due to energetic proton/ions and/or electrons from the dayside ring current. The life time of the DCAA under northward IMF conditions is much longer than that of the DCAA under southward IMF conditions. The length of DCAA ranges from 5° to 8° in magnetic latitude.