Quasi-periodic poleward motions of morningside Sun-aligned arcs: A multievent study

Details Quasi-periodic poleward motions of morningside Sun-aligned arcs: A multievent study Quasi-periodic poleward motions of morningside Sun-aligned arcs: A multievent study

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10224325s&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A11, p. 24325-24332

Physics

8

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

We study eight events of the quasi-periodic poleward motions of Sun-aligned auroral arcs in the high-latitude morning sector using all-sky image data and meridian scanning photometer data obtained at Resolute Bay (RSB; 84° magnetic latitude), Canada, during four winters from December 1992 to February 1996. More than 10% of morningside arcs observed at RSB move poleward repeatedly. The periodic are motions occur during intervals of interplanetary magnetic field Bz>0 or ~0, Bx>0 or <0, and By>0 or ~0. Most of the events occur around the end of substorm-like magnetic activity, suggesting that the source of moving arcs is related to the plasma sheet particles. Comparison with a global MHD simulation suggests that the observed poleward motion of arcs corresponds to inward (+YGSM direction) motion of source plasmas in the morningside tail flank where the plasmas from the low-latitude boundary layer and from the plasma sheet are mixed.

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