On shock strength and electric fields in the inner heliosphere

Details On shock strength and electric fields in the inner heliosphere On shock strength and electric fields in the inner heliosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh34a..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH34A-05

Physics

7851 Shock Waves, 2114 Energetic Particles, Heliospheric (7514), 2139 Interplanetary Shocks

Scientific paper

I explore the scaling of shock strength, cross-shock and convection electric field with heliospheric radius in the inner heliosphere. In the low β e inner heliosphere, the primary contribution to the cross-shock field may be due to Hall currents, which are shown to scale non-monotonically with Mach number and exhibit a local minimum near the Alfvèn speed peak at several solar radii. This allows that the shock and cross-shock component of the convection fields are nearly equal |ěc{E}shock| ≈ (ěc{v} × ěc{B})x, which is a condition for high efficiency of the shock-surfing mechanism of ion acceleration. Shock-surfing is thought to be a injection mechanism to diffusive acceleration and, indeed, observations show that energetic ion events are often accelerated at near this same heliospheric radius.

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