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Förslaget inkom 2007-06-01

Influence of ion mass on plasma penetration across magnetic barriers

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
Different mechanisms, like impulsive penetration and magnetic reconnection, have in the past few decades been suggested as possible means for the shocked solar wind plasma in the magnetosheath to enter the magnetosphere. Recent measurements from the Cluster spacecraft have shown that plasma indeed does penetrate the magnetopause. At KTH a series of experiments have been performed using a plasma gun that shoots a plasma at a transverse magnetic field. The plasma penetrates the barrier and enters the transverse field region. While doing so it generates waves in the lower hybrid frequency range.
Waves at lower hybrid frequencies have also been measured on the inside of the magnetopause by the Cluster spacecraft.

The objective of this project is to study how the ion gyro radius affects the experimental results. The plasma gun that was used in the experiments at KTH has been moved to West Virginia University where, at present, it is being reassembled and and modernised. The experimentalist is expected to make characterising measurements of the penetration across the magnetic barrier for plasmas with different ion species. The different species have different mass, and hence the ion gyro radius will differ. In this way the influence of the ion gyro radius on the penetration process can be assessed.

The project is carried out at West Virginia University (WVU) in the USA.

Research leader and scientific advisor at WVU is Dr Herbert Gunell.

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