Multi‐tube model for interplanetary magnetic clouds | Zendy

Osherovich Vladimir A. | Zendy; Fainberg J. | Zendy; Stone R. G. | Zendy

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Multi‐tube model for interplanetary magnetic clouds

Author(s) -

Osherovich Vladimir A.,

Fainberg J.,

Stone R. G.

Publication year - 1999

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/1998gl900306

Subject(s) - polytropic process , polytrope , magnetic cloud , physics , rope , magnetohydrodynamics , flux tube , tube (container) , superposition principle , mechanics , symmetry (geometry) , magnetic flux , interplanetary spaceflight , astrophysics , solar wind , magnetic field , plasma , geometry , materials science , nuclear physics , structural engineering , mathematics , quantum mechanics , engineering , composite material

Measurements of the polytropic index γ inside a magnetic cloud showed that there are two non‐equal tubes inside the cloud [ Fainberg et al. , 1996; Osherovich et al. , 1997]. For both tubes, γ < 1, but each tube has its own polytrope. We test equilibrium solutions which are a superposition of solutions with cylindrical and helical symmetry [ Krat and Osherovich, 1978] as a new paradigm for a multi‐tube model. Comparison of magnetic and gas pressure profiles for these bounded MHD states with observations suggests that complex magnetic clouds can be viewed as multiple helices embedded in a cylindrically symmetric flux rope.

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