... jets

Appendices are only available in electronic form at http://www.edpsciences.org

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... by

In the following we will use a system of units where the speed of light in vacuum, c=1, and a factor of $1/\sqrt{4\pi}$ is absorbed into the definition of the magnetic field. Greek subscripts in 4-vectors run from 0 to 3. We assume a metric signature (-,+,+,+).

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... series B1,

The cocoons of this model series are fully contained in the computational grid and, thus, the aspect ratios are significant, although the qualitative argument is valid for all the series of models.

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...$\beta \rightarrow 0$)

The expression is invalid for $\beta=0$. Therefore, we do not infer stability properties of the hydrodynamic models from Eq. (51).

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