Interpretation of complicated discrete arc structure and behavior in terms of multiple X lines

Details Interpretation of complicated discrete arc structure and behavior in terms of multiple X lines Interpretation of complicated discrete arc structure and behavior in terms of multiple X lines

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5292a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5292-5302.

Mathematics

Logic

21

Auroral Arcs, Magnetic Field Configurations, Neutral Sheets, Earth Magnetosphere, Magnetic Storms, Meteorological Satellites, Night Sky, Sky Brightness, Trapped Magnetic Fields

Scientific paper

A model of auroral arcs as the mapping along field lines of X line-O line pairs is applied to representative events in nightside data from a meridian-scanning photometer chain showing the growth, expansive, and recovery phases of two substorms; all-sky imager data; dayside data, including Viking UV images; and to a DMSP photograph of auroral activity. Features explained include the appearance, brightening, fading, and disappearance of arcs; the dividing of one arc into two; the uniting of two arcs into one; the branching of arcs; two classes of short-lived rapidly propagating arcs; a newly identified basic substorm intensification structure; and the reaction of two arcs to a westward traveling surge. These features are explained in terms of forward or reverse merging at one or more X lines. The motion of an arc is the resultant of a poleward velocity due to flux transfer through the X line and arc and the large-scale equatorward convection.

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