Magnetic impulse event: A detailed case study of extended ground and space observations

Details Magnetic impulse event: A detailed case study of extended ground and space observations Magnetic impulse event: A detailed case study of extended ground and space observations

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10625873k&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 25873-25890

Physics

9

Ionosphere: Plasma Convection, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

Analysis of conjugate data from extended magnetometer networks in northern and southern high latitudes is used to elucidate the initiation and the evolution of a magnetic impulse event (MIE) on June 6, 1997. In addition, data from all-sky imagers, imaging riometers, and Super Dual Auroral Radar Network radars in Antarctica are investigated to confirm the energy content, motion, and electrical current structure of the MIE. The MIE was accompanied by traveling convection vortices (TCVs) that began at ~10 MLT and moved eastward (toward dusk) and slightly equatorward at 1-3 km/s across the noon meridian with north-south conjugacy. The MIE had upward field-aligned currents with soft electron precipitation that was located near the trailing edge of the Hall current loop. During the MIE interval the interplanetary magnetic field (IMF) was directed strongly outward from the Sun (Bx=-5nT), with a slightly positive (1-2 nT) Bz, and a nearly zero By. Since abrupt solar wind pressure changes are unlikely under this IMF orientation (and none was, in fact, observed), classical mechanisms for MIE generation, such as a pressure pulse or dayside reconnection, are excluded. It is speculated that an abrupt IMF cone angle change from 60° to 20°, ~30 min prior to the MIE onset, may have been an indirect trigger of this event via the interaction between the solar wind and the bow shock.

Affiliated with

Also associated with

No associations

Rating

Magnetic impulse event: A detailed case study of extended ground and space observations 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 Magnetic impulse event: A detailed case study of extended ground and space observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic impulse event: A detailed case study of extended ground and space observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1555156