Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5957p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5957-5971. Research sponsored by CNES.
Physics
53
High Frequencies, Particle Acceleration, Plasma Turbulence, Polar Cusps, Viking Spacecraft, Charged Particles, Electromagnetic Noise, Electron Beams, Field Aligned Currents, Temporal Resolution
Scientific paper
Because of the high time resolution of many of its scientific instruments, the Viking satellite has detected the presence of intense wave bursts in the cusp/cleft regions, at altitudes between 1 and 2 earth radii. These bursts are closely related to the acceleration processes of charged particles and are characterized by a strong plasma turbulence illustrated by sporadic and intense broadband electrostatic noise detected in the 4- to 700-kHz frequency range of the high-frequency wave receiver. The duration of such bursts is small, typically a few hundreds of milliseconds, corresponding to a spatial width less than 1 km at the satellite altitude. The low-frequency part of this noise is always the most intense, with electric field amplitudes of a few tens of millivolts/m. This noise is correlated with 0.1- to 1-keV electron beams and with small-scale field-aligned currents and is always associated with low-frequency (about 1 Hz) electric field fluctuations. Perpendicular acceleration of ambient plasma ions occurs in connection with the bursts. The impulsive broadband waves are detected at the equatorward edge of the polar cusp and more generally in the entire cleft region. The central part of the cusp is characterized by an increase of the frequency cutoff of the hiss emissions, related to the increase of the electron density.
Aparicio Beatriz
Dubouloz Nicolas
Lundin Richard
Malingre Michel
Pottelette Raymond
No associations
LandOfFree
High-frequency waves in the cusp/cleft regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-frequency waves in the cusp/cleft regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-frequency waves in the cusp/cleft regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-782322