Cluster observations of structures at quasi-parallel bow shocks
نویسندگان
چکیده
منابع مشابه
Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations
We have performed full particle electromagnetic simulations of a quasi-perpendicular shock. The shock parameters have been chosen to be appropriate for the quasiperpendicular Earth’s bow shock observed by Cluster on 24 January 2001 (Lobzin et al., 2007). We have performed two simulations with different ion to electron mass ratio: run 1 withmi/me = 1840 and run 2 withmi/me = 100. In run 1 the gr...
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We use the Cluster EFW experiment to measure the cross-shock electric field at ten low β, quasi-perpendicular supercritical bow shock crossings on March 31, 2001. The electric field data are Lorentz-tranformed to a Normal Incidence frame (NIF), in which the incoming solar wind velocity is aligned with the shock normal. In a boundary normal coordinate system, the cross-shock (normal) electric fi...
متن کاملModelling Non-axisymmetric Bow Shocks
I present an extension of the thin layer approximation to non-axisymmetric bow shocks. By choosing a suitable set of curvilinear coordinates that matches the geometry of a generally distorted bow shock surface, I derive the fluid equations for the flow. Analytical expansions are given for the matter flow near the bow shock stagnation point. Numerical solutions are also obtained, by using a revi...
متن کاملThe Structure of Perpendicular Bow Shocks
A hybrid simulation model with kinetic ions, massless fluid electrons, and phenomenological resistivity is used to study the perpendicular configuration of the bow shocks of the earth and other planets. We investigate a wide range of parameters, including the upstream Mach number, electron and ion beta (ratios of thermal to magnetic pressure), and resistivity. Electron beta and resistivity are ...
متن کاملIdentifying Bow Shocks with Hα Allsky Surveys
OB–stars have the highest luminosities and strongest stellar winds of all stars, which enables them to interact strongly with their surrounding ISM, thus creating bow shocks. These offer us an ideal opportunity to learn more about the ISM. They were first detected and analysed around runaway OB–stars using the IRAS allsky survey by van Buren et al. (1995). Using the geometry of such bow shocks ...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2004
ISSN: 1432-0576
DOI: 10.5194/angeo-22-2309-2004