Behavior of Currents in Density Holes

Details Behavior of Currents in Density Holes Behavior of Currents in Density Holes

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh13a0380e&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH13A-0380

Physics

7514 Energetic Particles (2114), 7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)

Scientific paper

Density holes, observed by Cluster and Double Star satellites upstream from Earth's bow shock, show an average fractional density depletions {δ}n/n ~0.68 ±0.14 and are of mean duration ~& 17.9 ±10.4s. Density holes are accompanied by similarly shaped magnetic holes suggesting fields and particles are strongly coupled.The density and electromagnetic fields are amplified at the edges typically by a factor of 2-5. To further characterize these density and magnetic holes, we have used the four Cluster capabilities to study the behavior of currents.Currents are calculated using the curlometer technique, an application of Maxwell's law μ0J=∇×B. Moreover, the waves' direction of propagation is calculated to provide information on wave polarization. These analyses have been applied to several density holes including the April 2nd 2002 hole that has a minimum density of 0.5cm-3, an overshoot density of about 8cm-3 and a magnetic field amplification by ~4 times. The preliminary study of that hole reveals the following characteristics: The currents at the overshoot are amplified by a factor of 4.The current parallel to the magnetic field direction, J\|, is mostly positive signifying that it is pointing towards the earth's bow shock (Bx being negative). We also note that the amplitude of J\| is 3 times larger than that of J\bot. Furthermore, hodogram analysis shows that the magnetic field in the overshoot is right handed. Similar analysis will be made at the bow shock boundary to determine whether the mechanisms underlying shocks are similar to those causing the density holes.

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