Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock

Details Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock Multi-point electric field measurements of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d..26b&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 4, pp. 26-1, CiteID 1177, DOI 10.1029/2002GL015871

Physics

Plasma Physics

11

Space Plasma Physics: Shock Waves, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Discontinuities

Scientific paper

We present the first direct measurements of the electric field and plasma density with high resolution in Short Large-Amplitude Magnetic Structures (SLAMS) at a quasi-parallel shock crossing. Cluster observations at the Earth's bow shock confirm the fast-mode structure of SLAMS. Using the four Cluster spacecraft, we determine the velocity of the SLAMS vSLAMS and find that E = -vSLAMS × B. This indicates that locally the SLAMS is moving with the same velocity as the plasma, thus indicating trapping of ions. A small-scale (electron gyroradius) electric field with E ≠ -vSLAMS × B is found at the leading edge of the SLAMS. Downstream of several SLAMS, a wake-like decrease in the plasma density is observed suggesting the three-dimensional structure of SLAMS. The scale length of these SLAMS is of the order, or larger, than the satellite separation of 600 km.

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