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INSTITUTET FÖR RYMDFYSIK UPPSALA
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Swedish Institute of Space Physics (59o50.272'N, 17o38.786'E)
Student project at IRF Uppsala

Project work (30 c)/Examensarbete (30 hp)

Quasi-parallel bow shock

Student: Andreas Johlander, Uppsala University
Supervisor: Andris Vaivads
Period: Spring 2014

Goal

How is energetic ion seed population formed at quasi-parallel shock?

Abstract

Shocks are everywhere in Universe. They are some of the most spectacular and energetic phenomena, such as shocks generated by supernovae or stellar winds. Shocks are believed to be one of the most efficient particle accelerators in astrophysical plasma. Understanding particle acceleration to energies well above thermal energies (suprathermal) are one of the most important questions in astrophysical and space sciences. It is known that particle acceleration mechanisms can be very different for quasi-parallel and quasi-perpendicular shocks. The focus of this project work to explore the waves and nonlinear structures SLAMS upstream of quasi-parallel shocks as the source of suprathermal ion acceleration. To achieve the goal, the Earth bow shock observations in multi-spacecraft Cluster data are used. The structure of quasi-parallel shock is very complex; far upstream of shock one observes waves, that become nonlinear structures SLAMS on approaching the shock and that continously become a turbulent region consisting of waves and discontinuities with little studied properties. There have been developed theories that explain ion acceleration, however, detailed quantitative tests of these theories with respect to the observations are lacking to this date.

Results

Planned for June 2014.

[A nice picture]
Earth magnetosphere as seen in numerical simulation. Courtesy: Dietmar Krauss-Varban.

http://www.space.irfu.se/exjobb/2014_andreas_johlander/index.html
last modified on Friday, 28-Feb-2014 08:21:23 CET