Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10217489c&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue A8, p. 17489-17498
Physics
39
Atmospheric Composition And Structure: Airglow And Aurora, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
The DE 1 imaging instrumentation provides a full view of the entire auroral oval every 12 min for several hours during each orbit. We examined five examples of global evolution of the aurora that occurred during the northern hemisphere winter of 1981-1982 when the z component of the interplanetary magnetic field was positive and the y component was changing sign. Evolution of an expanded auroral emission region into a theta aurora appears to require a change in the sign of By during northward interplanetary magnetic field (IMF). Theta aurora are formed both from expanded duskside emission regions (By changes from positive to negative) and dawnside emission regions (By changes from negative to positive), however the dawnside-originating and duskside-originating evolutions are not mirror images. The persistence of a theta aurora after its formation suggests that there may be no clear relationship between the theta aurora pattern and the instantaneous configuration of the IMF.
Craven John D.
Cumnock Judy A.
Hairston Marc R.
Heelis Roderick A.
Sharber James R.
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