Determination of the dynamics of low frequency turbulence upstream and downstream of the Earth's Bow shock using Cluster measurements
Abstract
Collisionless shocks (CS) are associated with many astrophysical objects and phenomena, such as supernovae remnants, cosmic ray acceleration, and binary systems. They are also encountered throughout the heliosphere upstream of planets, in interplanetary space and at the edge of heliosphere (termination shock). Observations have shown that CS are often accompanied by magnetic turbulence upstream and downstream of the shock main ramp. It is important to study the origins of this turbulence and the relationship between the plasma turbulence with the energy redistribution of the solar wind, from bulk flow to thermal energy. In order to achieve that, the nature, dynamics and composition of the turbulence must first be determined. The Cluster multi-spacecraft mission provides favorable conditions, through the close separation campaign, to identify the spatial and temporal variations of this low frequency turbulence. Magnetic field measurements of turbulence upstream and downstream of the Bow Shock are examined. The experimental dispersion relation of the turbulence is determined using wavelet transform techniques.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMSH21A2515G
- Keywords:
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- 7829 Kinetic waves and instabilities;
- SPACE PLASMA PHYSICSDE: 7845 Particle acceleration;
- SPACE PLASMA PHYSICSDE: 7851 Shock waves;
- SPACE PLASMA PHYSICSDE: 7867 Wave/particle interactions;
- SPACE PLASMA PHYSICS