Relative timing of substorm onset phenomena

Details Relative timing of substorm onset phenomena Relative timing of substorm onset phenomena

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10904203k&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A4, CiteID A04203

Physics

20

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Current Systems (2409)

Scientific paper

In this paper we examine the temporal ordering of midtail flow bursts, Pi2 pulsations, and auroral arc brightening at substorm onset. We present three substorm events for which the Geotail spacecraft was situated at local midnight, near the inner edge of the plasmasheet. We show that high-speed, convective Earthward directed plasma flows observed by Geotail occurred 1-3 min before auroral onset as observed by the Polar Visible Imaging System and Ultraviolet Imager auroral imagers on board the Polar spacecraft. We also show that the onsets of both nightside Pi2 pulsations and magnetic bay variations were simultaneous with auroral onset. We argue that these observations lend strong support to the flow burst-driven model of magnetotail dynamics. We also examine a high-latitude magnetic precursor to onset and show that it is likely due to the currents expected from the passage of a flow burst through the plasmasheet prior to substorm onset. Finally, we calculate an analytic expression for this current and show that it is unlikely to generate discrete auroral structures.

Affiliated with

Also associated with

No associations

Rating

Relative timing of substorm onset phenomena 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 Relative timing of substorm onset phenomena, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relative timing of substorm onset phenomena will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-736011