HR: 0800h
AN: SM31A-1218    [Abstracts]
TI: Auroral particles associated with a brightening arc
AU: * Yago, K
EM: yago@stelab.nagoya-u.ac.jp
AF: Solar-Terrestrial Environment Laboratory, Nagoya University, Honohara 3-13, Toyokawa, 442-8507 Japan
AU: Shiokawa, K
EM: shiokawa@stelab.nagoya-u.ac.jp
AF: Solar-Terrestrial Environment Laboratory, Nagoya University, Honohara 3-13, Toyokawa, 442-8507 Japan
AU: Yumoto, K
EM: yumoto@serc.kyushu-u.ac.jp
AF: Space Environment Research Center, Kyushu University, Hakozaki 6-10-1, Fukuoka, 812-8581 Japan
AB: We investigated characteristics of auroral particles precipitating to a brightening arc at the initial phase of a substorm, using auroral images obtained by high-time resolution (0.25 s) all-sky TV camera, particle data obtained by the DMSP F10 spacecraft and high-latitude magnetograms. The arc brightening was observed at 0407 UT on December 30, 1994 at Fort Smith (67.0 MLAT), Canada, coincident with high-latitude Pi 2 magnetic pulsations. The event has two characteristics; 1) the brightening did not develop into global scale (pseudo-breakup), and 2) Fort Smith seemed to be duskside of the main onset region. From the simultaneous DMSP particle data, we found that the brightening arc corresponded to an electron inverted-V structure near the equatorward edge of the electron precipitation region and at ~2 deg poleward of the equatorward edge of the ion precipitation region. This fact suggests that for the present event, the pseudo-breakup of auroral substorm occurred in the inner part of the plasma sheet.
DE: 2700 MAGNETOSPHERIC PHYSICS
DE: 2704 Auroral phenomena (2407)
DE: 2716 Energetic particles, precipitating
DE: 2736 Magnetosphere/ionosphere interactions
DE: 2740 Magnetospheric configuration and dynamics
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting