Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008arep...52..925z&link_type=abstract
Astronomy Reports, Volume 52, Issue 11, pp.925-930
Astronomy and Astrophysics
Astronomy
2
96.60.Pf
Scientific paper
We analyze the properties of the electric-current distribution over the cross sections of fairly dense coronal magnetic flux tubes in which the plasma pressure exceeds the magnetic pressure, so that the equilibrium is maintained by the ambient magnetic field. If the plasma is fully ionized, the distributions of the longitudinal and azimuthal currents over the cross section of the loop have the same spatial scale as the pressure distribution. However, even a small number of neutral atoms in the corona (with a mass fraction of the order of 10-5, taking into account the partial ionization of helium) substantially modifies the current distribution over the tube cross section: in this case, a considerable fraction of the full current flowing along the tube is concentrated in a thin region near the axis with a radius of the order of (10-2 10-3) r 0 (where r 0 is the characteristic scale of the plasma-pressure distribution over the tube), thus forming a sort of a jet current. This comes about because the pattern of the conductivity anisotropy is substantially modified in the presence of ion-atom collisions in the magnetoactive plasma of the tube, and the Cowling conductivity dominates over the Hall and Pedersen conductivities. The high current density near the axis of the tube can ensure heating of the plasma to coronal temperatures via Joule dissipation.
Kruglov A. A.
Zaitsev Valerii V.
No associations
LandOfFree
Jet structure of electric currents in coronal magnetic loops does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Jet structure of electric currents in coronal magnetic loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Jet structure of electric currents in coronal magnetic loops will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1843500