Creation of Theta-Auroras: The Isolation of Plasma Sheet Fragments in the Polar Cap

Details Creation of Theta-Auroras: The Isolation of Plasma Sheet Fragments in the Polar Cap Creation of Theta-Auroras: The Isolation of Plasma Sheet Fragments in the Polar Cap

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...270.1338n&link_type=abstract

Science, Volume 270, Issue 5240, pp. 1338-1341

Physics

29

Scientific paper

The auroral oval is a ring of luminosity enclosing geomagnetic field lines connected to the solar wind. Occasionally the ring has a bar across it, which seems to imply a bifurcation of the open region. Here results confirm that this "θ-aurora" actually does represent this odd bifurcated configuration, and they demonstrate how it happens. It has hitherto been assumed that θ-auroras occur when the interplanetary magnetic field is directed northward, because that is true of most very-high-latitude arcs. In fact, θ-auroras occur exclusively during the dynamic reconfiguration that follows when the interplanetary magnetic field turns southward after a prolonged northward interval.

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