The Current-Free Electric Double Layer in a Coronal Magnetic Funnel

The Current-free Electric Double Layer in a Coronal Magnetic Funnel

Current-free double layers (CFDLs) have been recently discovered in a number of laboratory devices, when a low collisional plasma is forced to expand from a high magnetic field source region to a low magnetic field diffusion region. This experimental setup bears a striking resemblance to the natural conditions prevailing in the magnetic funnels of the solar corona. It was commonly thought that ...

Upflows in funnel-like legs of coronal magnetic loops

The prominent blue shifts of Ne viii associated with the junctions of the magnetic network in the quiet Sun are still not well understood. By comparing the coronal magnetic-field structures as obtained by a potential-field reconstruction with the conspicuous blue-shift patches on the dopplergram of Ne viii as observed in an equatorial quiet-Sun region, we find that most of the regions with sign...

High source potential upstream of a current-free electric double layer

Large plasma potentials sup to ,80 Vd are measured upstream of a current-free electric double layer generated in a helicon rf argon discharge for a constant rf power of 250 W sat 13.56 MHzd and for low operating pressures s,2 mTorrd using an electrostatic ion energy analyzer. The energy of the Ar+ ion beam formed by acceleration through the potential drop of the double layer is found to be stro...

Reconstruction of Solar Coronal Linear Force-Free Magnetic Field

Time development of a current-free double-layer