Simultaneous Measurements of the High-Energy Particle Properties at a Cusp Diamagnetic Cavity and Surrounding Magnetosheath: Evidence for Local Acceleration Mechanism?

Details Simultaneous Measurements of the High-Energy Particle Properties at a Cusp Diamagnetic Cavity and Surrounding Magnetosheath: Evidence for Local Acceleration Mechanism? Simultaneous Measurements of the High-Energy Particle Properties at a Cusp Diamagnetic Cavity and Surrounding Magnetosheath: Evidence for Local Acceleration Mechanism?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51b1637n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51B-1637

Physics

2706 Cusp, 2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2753 Numerical Modeling, 7845 Particle Acceleration

Scientific paper

On February 2003 four Cluster spacecraft had a tetrahedron separation of 5000 km when they encountered a large cusp diamagnetic cavity characterized by depressed and fluctuating magnetic field and increased fluxes of high energy (up to ~ 160 keV) electrons, protons and helium. The Cluster separation provided a unique opportunity to determine the large scale structure of the cavity as well as to simultaneously calculate properties of the high energy particles in the cavity and surrounding magnetosheath. The RAPID data indicates that most high energy particles in the cavity have pitch angles of 75-100 degrees, and the High Energy Particle (HEP) fluxes drop in the magnetosheath as a function of distance from the cavity boundary, which would be more supportive of the local acceleration mechanism. We have compared our Cluster observations with the test particle simulations in the high resolution MHD cusp model, which indicates that local acceleration at least to energies of ~ 60 keV is possible due to the 'quasi'-potential which is formed due to reconnection. Additional acceleration may arise from the non-MHD processes. But the story may not be so simple, as there are few HEP intervals with lower fluxes in the magnetosheath that have pitch-angles of 15-45 degrees that could originate from the quasi-parallel bow shock. We will also discuss the origin of the 'turbulence' in the cavity.

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