Computer Science – Sound
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itps...17..150r&link_type=abstract
IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 17, April 1989, p. 150-157.
Computer Science
Sound
6
Atmospheric Models, Ionospheric Currents, Magnetohydrodynamic Stability, Plasma Sheaths, Polar Substorms, Satellite Sounding, Electric Fields, Magnetic Storms, Maxwell Equation, Viking Spacecraft
Scientific paper
A model for substorm breakup is developed, based on (1) the relaxation of stretched (closed) dipolar field lines and (2) the formation of an incipient current wedge within a single arc structure. It is argued that (2) leads to a quasi-stable system; i.e., the prebreakup regime. Perturbation of the prebreakup structure leads to an instability criterion. It is found, consistent with observations, that narrower auroral arcs at lower L shells undergo the most explosive poleward expansion. In this model, the precise location at which breakup occurs depends on the O(+) density in the plasma sheet, the level of magnetic activity (Kp), and the intensity of the substorm westward electrojet in the ionosphere. Comparison of the proposed model with the Heppner-Maynard polar-cap-potential model indicates that breakup is restricted to the west of the Harang discontinuity, consistent with recent Viking observations.
Block Lars P.
Fälthammar Carl-Günne
Rothwell Paul L.
Silevitch Michael B.
No associations
LandOfFree
A new model for auroral breakup during substorms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A new model for auroral breakup during substorms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new model for auroral breakup during substorms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1737722