CLUSTER observation of collisionless transport at the magnetopause

Details CLUSTER observation of collisionless transport at the magnetopause CLUSTER observation of collisionless transport at the magnetopause

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315109p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15109

Physics

6

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Plasma Waves And Turbulence, Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

On May 10, 2002 the CLUSTER spacecraft (SC) encountered a ~450 km (five magnetosheath thermal proton gyro-radii) wide high-latitude magnetopause (MP). Magnetic field observations indicate the crossing of a ~130 km thick MP current sheet (CS) located inside a magnetic hole. Proton flux measurements diagnose a dense boundary layer (BL) directly attached to the MP and an additional rare BL located earthwards from the MP. Enhanced magnetic fluctuations are found near the local proton-cyclotron frequency Ωcp (0.4-2 Hz). Applying the phase-differencing technique we obtained a wavelength of 150-250 km and the propagating direction earthward perpendicular to the MP. Inside the MP the pitch-angle proton distribution demonstrates the presence of a transverse population. The formation of the two BLs can be understood by enhanced collisionless diffusion of magnetosheath protons due to wave-particle interaction, while higher-energy protons (Wp > 300 eV) penetrate into the BLs also via finite gyro-radius effect.

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