G. Gustafsson(1), M. André(1), H. Alleyne(2), L. Blomberg(3), R. Bostrom(1), T.

Carozzi(1), C. Cattell(4), N. Cornilleau-Wehrlin(5), P. Décréau(6), A. Egeland(7),

A. Eriksson(1), C-G. Falthammar(3), R. Grard(8), D. Gurnett(9), C. Harvey(10), B.

Holback(1), G. Holmgren(11), O. Holter(7), J. Holtet(7), P. Kellogg(4), Y.

Khotyaintsev(1), P. Kintner(12), S. Klimov(13), H. Laakso(8), J-P. Lebreton(8), P-A.

Lindqvist(3), B. Lybekk(7), R. Manning(14), M. Maksimovic(14), G.

Marklund(3), N. Maynard(15), J. Moen(7), F. Mozer(16), K. Mursula(17), H.

Opgenoorth(1), A. Pedersen(7), H. Pecseli(7), R. Pfaff(18), B. Popielawska(19), I.

Roth(16), A. Roux(5), H. Singer(20), K. Stasiewicz(1), R. Schmidt(8), P.

Tanskanen(17), M. Temerin(16), O. Thrane(7), J-E. Wahlund(1), J. Wygant(4)

(1)IRF-U, Uppsala, Sweden, (2) University of Sheffield, Sheffield, UK, (3) Alfvén

Lab.,Stockholm, Sweden, (4) SPA, Minneapolis, USA, (5) CETP, Vélizy, France,

(6) LPCE, Orléans, France, (7) University of Oslo, Oslo, Norway, (8) SSD/ESTEC,

Noordwijk, The Netherlands, (9) University of Iowa, Iowa City, USA, (10 CESR,

Toulouse, France, (11) University of Uppsala, Uppsala, Sweden, (12) SEE. Ithaca,

USA, (13) IKI, Moscow, Russia, (14) DESPA Obs., Meudon, France, (15) MRC,

Nashua, USA, (16) UCB, Berkeley, USA, (17) University of Oulu, Oulu, Finland,

(18) GSFC, Greenbelt, USA, (19) SRC, Warsaw, Poland, (20) NOAA SEC,

Boulder, USA. Fax+46 18 4715905

Each of the four Cluster spacecraft carry an electric field and wave experiment

called EFW to measure quasi-static electric fields, plasma waves and spacecraft

potential for plasma density observations. A unique preamplifier design provides

measurements from DC to 600 kHz with high accuracy and low noise levels. Signals

from the EFW probes are also delivered on board to the other wave instruments on

Cluster. Waveform data of the potential between two orthogonal pairs of probes, or

the current to individual probes, or a combination of potential and current signals are

recorded on EFW. The signals are filtered with antialiasing filters at 10 or 180 Hz.

Snapshots at higher frequencies are also available using an internal memory. All

four instruments with a total number of 16 probes work nominally, with no

problems. A short description of the instrument with its new probe environment

design and an overview of early results will be presented.