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- Title
Generation of superDreicer electric fields in the solar chromosphere.
- Authors
Zaitsev, V.; Kronshtadtov, P.; Stepanov, A.
- Abstract
The electric field generation at the front of the current pulse, which originates in a coronal magnetic loop owing to the development of the Rayleigh-Taylor magnetic instability at loop footpoints, has been considered. During the τ ≈ l/V ≈ 5−25 s time (where l is the plasma plume height entering a magnetic loop as a result of the Rayleigh-Taylor instability), a disturbance related to the magnetic field tension B ( r,t), 'escapes' the instability region with the Alfvén velocity in this case. As a result, an electric current pulse I( z − V t), at the front of which an induction magnetic field E , which is directed along the magnetic tube axis and can therefore accelerate particles, starts propagating along a magnetic loop with a characteristic scale of Δξ ≈ l. In the case of sufficiently large currents, when B /8π > p, an electric current pulse propagates nonlinearly, and a relatively large longitudinal electric field originates E ≈ 2 I V / c aB l, which can be larger than the Dreicer field, depending on the electric current value.
- Subjects
SOLAR chromosphere; ELECTRIC fields; RAYLEIGH-Taylor instability; MAGNETIC fields; ELECTRIC currents
- Publication
Geomagnetism & Aeronomy, 2016, Vol 56, Issue 7, p903
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793216070197