What do we learn form the combined study of CLUSTER and DSP U/ELF waves at the magnetopause and in the tail?

HR: 17:25h
AN: SM24A-06 [Abstracts]
TI: What do we learn form the combined study of CLUSTER and DSP U/ELF waves at the magnetopause and in the tail?
AU: Cornilleau-Wehrlin, N
EM: nicole.cornilleau@cetp.ipsl.fr
AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Alleyne, H S
SM24A-06 AF: University of Sheffield, Mappin Street, Sheffield, S1 3JD United Kingdom
AU: Yearby, K H
SM24A-06 AF: University of Sheffield, Mappin Street, Sheffield, S1 3JD United Kingdom
AU: Attie, D
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: * Sahraoui, F
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Belmont, G
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Rezeau, L
SM24A-06 AF: CETP/IPSL/UPMC, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Le Contel, O
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Roux, A
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Robert, P
SM24A-06 AF: CETP/IPSL, 10-12 Av. de l'Europe, VＭizy, 78140 France
AU: Carr, C
SM24A-06 AF: The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ United Kingdom
AU: Luceck, E
SM24A-06 AF: The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ United Kingdom
AB: The STAFF-DWP wave instrument onboard the equatorial spacecraft (TC1) of the Double Star Project consists of a combination of 2 instruments which are a heritage of the Cluster mission: the Spatio Temporal Analysis of Field Fluctuations (STAFF) experiment and the Digital Wave-Processing experiment (DWP). The complementary Cluster and TC1 orbits together with the similarity of the instruments permits new multi-point studies. Among the different possible physical processes to transfer mass and momentum from the solar wind to the magnetosphere is the ULF turbulence at the magnetopause. The comparison between DSP and Cluster data should say whether the low latitude and the noon or subsolar region is more favourable than high latitude, and/or morning and evening local times. A first analysis of simultaneous Cluster and DSP data sets shows that in the time period between 21-02-2004 and 22-05-2004 there are 21 coordinated magnetopause crossings, i.e. within less than 3 hours, out of which 16 are within one hour time delay. The other magnetopause crossing periods will be studied. The results of this study will be shown, together with more recent magnetopause crossing periods. The first results seem to indicate that the U/ELF wave power is stronger at low latitude than at high latitude. From DSP-Cluster comparisons some answers may be found to the question not yet resolved concerning the processes that trigger substorms in the tail. Timing studies should help decide between the different scenarios, the similarity of the instruments onboard Cluster and DSP together with their respective orbits giving a 6 RE separation at apogee, making this comparison a priori quite suited to substorm studies. The wave events in the tail are weaker than at the magnetopause, giving the number of coordinated events smaller, but nevertheless promising.
DE: 2700 MAGNETOSPHERIC PHYSICS (6939)
DE: 2724 Magnetopause and boundary layers
DE: 2744 Magnetotail
DE: 2772 Plasma waves and instabilities (2471)
DE: 2790 Substorms
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005