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Ann. Geophys., 16, 1105-1116, 1998
www.ann-geophys.net/16/1105/1998/
© European Geosciences Union 1998

ULF wave measurements onboard the Interball auroral probe

S. Perraut¹, A. Roux¹, F. Darrouzet¹, C. de Villedary¹, M. Mogilevsky², and F. Lefeuvre^3
1CETP/UVSQ, 10-12 Av. de l'Europe, F-78140 Velizy, France
Fax: +1/39 25 49 22; e-mail: sylvaine.perraut@cetp.ipsl.fr
²Space Research Center, Profsoyuznaya 84/32, Moscow, Russia
³LPCE, 3A, Av. de la Recherche Scientifique, F-45071 Orleans cedex 2, France

Abstract. The IESP experiment implemented onboard the Interball auroral probe measures the six components (3B, 3E) of the waves in the ULF range: 0.1–10 Hz and from time to time 0–30 Hz. Two different kinds of waves have been observed in the auroral region at altitudes between 10 000 and 20 000 km: (1) electrostatic emissions which consist of quasi-monochromatic structures with frequencies above the oxygen gyrofrequency, superimposed on a wide band signal interpreted as a Doppler broadening, (2) electromagnetic wide band spectrum fluctuations. These emissions are interpreted as current-driven electromagnetic or electrostatic ion cyclotron waves. The electromagnetic/electrostatic character is controlled by the plasma parameter β_i and by the O⁺ concentration.

Key words. Magnetospheric physics · Auroral phenomena · Plasma waves and instabilities · Interball Auroral probe

Full Article (PDF, 1243 KB)

Citation: Perraut, S., Roux, A., Darrouzet, F., de Villedary, C., Mogilevsky, M., and Lefeuvre, F.: ULF wave measurements onboard the Interball auroral probe, Ann. Geophys., 16, 1105-1116, 1998.   Bibtex   EndNote   Reference Manager