ICS-13 Abstract View


What triggers a substorm expansion phase onset?
Nishimura, Toshi, toshi16@bu.edu (1)
Sergeev, Victor, victor@geo.phys.spbu.ru (2)
Starting a dialogue on this topic, which has been hot and controversial for more than 30 years (and continues to be so), we first briefly review a historical context of substorm triggering research and also step back and critically discuss a general approach --whether substorm onset definitions used in the community are adequate; --what are potential problems with the existing approach and other perspectives/choices/opportunities. Then we briefly summarize and discuss recent advances in substorm triggering research, attempting to address key questions of onset triggering (in observations, theory, modeling and mapping ): --Where in magnetosphere the auroral breakup/substorm onset are initiated?; --Which conditions are required to ignite the breakup/onset?; --Does onset require being triggered by precursors (flow burst intrusion etc.) or can be spontaneous?; --What is the mechanism of substorm onset (spontaneous or driven)? --What do control the size of processes after initial brightening?

The dialogue also invites short presentations (1-2 slides with 1-2 brief statements) from the audience (please, inform us in advance) to form collectively a representative view where we are in this problem.
(1) Department of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, MA 02215, USA
(2) Earth Physics Department, St. Petersburg State University, 198504 St. Petersburg, Russia