Electrostatic and electromagnetic emissions near the plasmapause. A case event: 
27 May 2003

F. El-Lemdani Mazouz, S. Grimald, J.L. Rauch, P.M.E. Decreau, G. Bozan, 
G. Le Rouzic,  X. Suraud, X. Vallieres, J.G. Trotignon, P. Canu, F. Darrouzet, 
S. Boardsen    


We present in this paper a review of electric emissions in the high frequency
range (2-80 kHz) by the CLUSTER constellation crossing the outer plasmasphere
at its perigee. During the considered event, dated 27th May 2003, the
constellation separation was large (5000 km) and the geomagnetic activity high 
(Kp ~ 4 - 5). A large panel of natural emissions are observed, in particular
non thermal continuum emissions (NTC) and electrostatic emissions related to 
fce, where fce is the local electron gyrofrequency. Intense NTC emissions
visible in the northern hemisphere can be related with simultaneous
observations from the IMAGE satellite, informing about large scale beaming 
properties. We present details about equatorial emissions at (n+ 1/2) fce and
emissions at (n+1.1) fce observed at higher latitude. Lastly, intense emissions 
near the local plasma frequency fp are observed within large scale density
irregularities. 

_______________ 
Proceedings of the Cluster and Double Star Symposium, 5th Anniversary of 
Cluster in Space, ESTEC, Noordwijk, The Netherlands, 19-23ÊSeptember 2005