Modulated electron-acoustic waves in auroral density cavities: FAST observations

Details Modulated electron-acoustic waves in auroral density cavities: FAST observations Modulated electron-acoustic waves in auroral density cavities: FAST observations

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2629p&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2629-2632

Physics

Plasma Physics

77

Space Plasma Physics: Electrostatic Structures, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

We report on FAST observations of large amplitude (up to 500 mVm-1) envelope solitary waves at the edges of the AKR source region. These edges are characterized by the presence of two electron populations: a dominant hot (~keV) component and a minority cold (<60 eV) component. The nonlinear waves are recorded when the spacecraft passes the base of the parallel auroral acceleration region. They form intense packets of electron acoustic waves. The modulation is due to ion acoustic waves. These structures are electrostatic and propagate along the magnetic field at speeds of a few 100 kms-1. They may play a crucial role in the acceleration processes taking place in these regions.

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