TY - GEN

T1 - Do the observations confirm the high-speed flow braking model for substorms?

AU - Yahnin, AG

AU - Kornilov, IA

AU - Kornilova, TA

AU - Sergeev, VA

AU - Lui, ATY

AU - Liou, K

AU - Meng, CI

AU - Pajunpaa, A

PY - 2000

Y1 - 2000

N2 - We selected several cases when Geotal satellite situated in the mid-tail was in conjunction with ground-based all-sky TV cameras observing auroral breakups. Localisation of auroral events within the field of view of ground-based stations has been controlled by the Polar imager data. Some of the events exhibited the existence of high-speed (500-700 km/s) Earthward plasma flows within the plasma sheet before the breakups. To verify if the fast flow could be a cause of the breakups a detailed consideration and timing of the phenomena has been done. We concluded that in the considered cases there was no causal relationship between fast Earthward flows and breakups. In addition a search for auroral precursors, which could occur poleward of pre-breakup are just before breakup, has been performed. As such structures might be subvisual, some filtration methods were applied to the TV data. Our analysis did not show any auroral precursors. Thus, our observations failed to confirm the model of substorm, which connects the auroral onset with the braking of the high-speed Earthward plasma flow.

AB - We selected several cases when Geotal satellite situated in the mid-tail was in conjunction with ground-based all-sky TV cameras observing auroral breakups. Localisation of auroral events within the field of view of ground-based stations has been controlled by the Polar imager data. Some of the events exhibited the existence of high-speed (500-700 km/s) Earthward plasma flows within the plasma sheet before the breakups. To verify if the fast flow could be a cause of the breakups a detailed consideration and timing of the phenomena has been done. We concluded that in the considered cases there was no causal relationship between fast Earthward flows and breakups. In addition a search for auroral precursors, which could occur poleward of pre-breakup are just before breakup, has been performed. As such structures might be subvisual, some filtration methods were applied to the TV data. Our analysis did not show any auroral precursors. Thus, our observations failed to confirm the model of substorm, which connects the auroral onset with the braking of the high-speed Earthward plasma flow.

M3 - статья в сборнике материалов конференции

SN - 92-9092-772-0

T3 - ESA SPECIAL PUBLICATIONS

SP - 345

EP - 348

BT - PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS

A2 - Wilson, A

PB - ESA Publication Division

Y2 - 16 May 2000 through 20 May 2000

ER -