Polarization jet events and excitation of weak SAR arcs
Article first published online: 27 JUN 2002
Copyright 2002 by the American Geophysical Union.
Geophysical Research Letters
Volume 29, Issue 12, pages 26-1–26-4, June 2002
How to Cite
Polarization jet events and excitation of weak SAR arcs, Geophys. Res. Lett., 29(12), doi:10.1029/2001GL014388, 2002., , , , , and ,
- Issue published online: 27 JUN 2002
- Article first published online: 27 JUN 2002
- Manuscript Accepted: 5 FEB 2002
- Manuscript Revised: 24 JAN 2002
- Manuscript Received: 13 NOV 2001
 Polarization Jet (PJ), also known as Sub-Auroral Ion Drift (SAID), events are supersonic westward plasma drifts on the equatorward edge of the diffuse aurora in the evening and nighttime sector. Their optical F-region signatures are weak 630.0 nm red arcs colocated with regions of fast convection. These weak arcs resemble Stable Auroral Red (SAR) arcs observed during the recovery phase of magnetic storms, but have lower intensities, shorter lifetimes, and occur without a significant heat flux from the magnetosphere. Previous model studies underestimated the brightness of weak SAR arcs. We present calculations showing that ion-neutral collisional heating and ion composition changes during PJ events may be an additional source of 630.0 nm emission, and propose experimental tests that could verify our modeling results.