Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh33b..01p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-01
Physics
7829 Kinetic Waves And Instabilities, 7851 Shock Waves (4455), 7852 Solitons And Solitary Waves (4455)
Scientific paper
We present new observations of density holes upstream of Earth's bow shock. Density holes are regions of density depletions below the solar wind level with scale length of an ion gyroradius. They represent the smallest nonlinear ion structures produced by the solar wind. The edges of density holes have strong currents and as the holes propagate earthward the magnetic field evolves nonlinearly into a shock-like structure.We have examined how the solar wind energy flux changes as it approaches the density holes. The ith component of the energy flux 2Qi = nm2i> + nm i>2 + 2nm i?vj>j> + nm2?vi> is measured by the plasma instrument on Cluster. We will identify how macroscopic and microscopic energies of ions flow and vary in the neighborhood of density holes. These observations have the potential to provide information on how the solar wind energy is dissipated and plasmas transported across collisionless boundaries.
Dandouras Iannis
de Guiran R.
Goldstein Michael
Kearney B.
Lee Edward
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