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Magnetic helicity - Wikipedia Magnetic helicity In plasma physics, magnetic helicity is a measure of the linkage, twist, and writhe of a magnetic field [1][2] Magnetic helicity is a useful concept in the analysis of systems with extremely low resistivity, such as astrophysical systems
Magnetic helicity signature produced by cross-field 2D turbul. . |INIS The background magnetic field is perpendicular to the simulation plane, which eliminates linear kinetic Alfvén waves from the system The normalized magnetic helicity of the initial large-scale fluctuations is zero, while the normalized cross-helicity is not
Introduction to magnetic helicity and its computation Magnetic helicity is a geometrical measure of the twist and writhe of the magnetic field lines, and of the amount of flux linkages between pairs of lines (Gauss linking number)
Statistical Properties of Alfvén Ion Cyclotron Waves and Kinetic Alfvén . . . To examine the statistical properties of the background parameters for ACWs and KAWs and related wave disturbances, both wave events observed by Parker Solar Probe are selected and analyzed The results show that there are obvious differences in the background and disturbance parameters between ACWs and KAWs
Magnetic helicity – Anthony Yeates Field line helicity can be defined as A (x) = lim ε → 0 h (V ε (x)) Φ ε (x), namely the helicity of an infinitesimally thin tube around a single magnetic field line, normalised by the tube’s flux to give a finite limit
New formulae for magnetic relative helicity and field line helicity We next show that, for a speci c choice of C r, the eld line helicity h of B fully characterizes the magnetic mapping M and then the topology of the lines Finally, we give a formula that describes the rate of change of h in a situation where the plasma moves on the perfectly conducting boundary S without changing B