Using MHD/particle simulations to study the origin of EMIC waves during the compression event of 29 June 2007

Details Using MHD/particle simulations to study the origin of EMIC waves during the compression event of 29 June 2007 Using MHD/particle simulations to study the origin of EMIC waves during the compression event of 29 June 2007

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1740m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1740

Physics

2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling, 2788 Magnetic Storms And Substorms (7954), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

On 29 June 2007, EMIC waves were observed on the ground by the CARISMA network of magnetometers and by three THEMIS spacecraft between L=5 and L=6.5. There are two theoretical pictures for the generation for these waves: Olson and Lee [1982] suggested that such waves may be generated by an adiabatic compression of the dayside magnetosphere, which causes the particles to preferentially gain energy perpendicular to the magnetic field. This, in turn, leads to the beam instability generally thought to produce EMIC waves. Summers et al. [1998] put forward the idea that substorm-injected ring current ions driven by enhanced convection excite EMIC waves near the plasmapause. We use the LFM global MHD model to simulate the event, with upstream boundary conditions determined by observations at the ACE (Advanced Composition Explorer) spacecraft. We then use a Lorentz solver to calculate test particle trajectories, and use these results to compute phase space densities of keV protons. We examine temperature anisotropies in ring current ions and compute EMIC wave growth rates for this event. Results are compared with the observations of Usanova et al. [2008], and with results from the two competing theories.

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