05/03/02
CERISIER Jean-Claude	CETP
4 Avenue de Neptune	PNP- PNST-
94107	Saint Maur, F

Presentation 1 : Poster
The magnetospheric convection and the SuperDARN radar network (PNST)
J.-C. Cerisier, J.-P. Villain and the SuperDARN team
The SuperDARN (Dual Auroral Radar Network) coherent HF radars monitor the large-scale ionospheric convection from the Doppler shift affecting the signal coherently backscattered by electron density irregularities frozen in the ionospheric plasma. A network of 15 radars with a field of view covering the northern and southern auroral zones and polar caps provides in real time a global view of the response of the magnetosphere to variations of the parameters of the interplanetary medium. The principle of the radars and their diagnostic potential are reviewed.
Presentation 2 : Poster
SuperDARN and the ground-satellite conjugate studies (PNST)
J.-C. Cerisier, A. Marchaudon, M. Bouhram, J.-P. Villain and the SuperDARN team
The SuperDARN HF radars measure the convection velocity of the plasma in the magnetosphere and ionosphere with a high-time resolution (1 min) and a large spatial coverage. They are thus complementary to in-situ measurements by earth satellites allowing their integration into a global view of the dynamical magnetospheric system. We present a few examples of coordinated studies with the Interball and Cluster satellites. Various physical processes will be described, such as (1) ionospheric plasma escape, (2) plasma dynamics in the polar cusps during sporadic reconnection events, (3) the dynamics of magnetospheric boundaries associated with changes in the interplanetary magnetic field.

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