ULF wave measurements onboard the Interball auroral probe

Details ULF wave measurements onboard the Interball auroral probe ULF wave measurements onboard the Interball auroral probe

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16.1105p&link_type=abstract

Annales Geophysicae, vol. 16, Issue 9, pp.1105-1116

Physics

13

Scientific paper

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 i and by the O+ concentration.

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