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Writhed Analytical Magnetic Flux Rope Model

Weiss, A. J. ; Nieves-Chinchilla, T. ; Möstl, C. ; Reiss, M. A. ; Amerstorfer, T. ; Bailey, R. L.

Journal of geophysical research. Space physics, 2022-12, Vol.127 (12), p.e2022JA030898-n/a [Periódico revisado por pares]

Goddard Space Flight Center: American Geophysical Union

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Título:
Writhed Analytical Magnetic Flux Rope Model
Autor: Weiss, A. J. ; Nieves-Chinchilla, T. ; Möstl, C. ; Reiss, M. A. ; Amerstorfer, T. ; Bailey, R. L.
Assuntos: Coronal mass ejection ; Coronal Mass Ejections ; Ejecta, Driver Gases, and Magnetic Clouds ; Fluctuations ; flux rope modeling ; flux ropes ; Geometry ; ICMEs ; Interplanetary Physics ; Iterative methods ; Magnetic clouds ; Magnetic fields ; Magnetic flux ; Magnetic Storms ; Magnetic Storms and Substorms ; Magnetism ; Magnetospheric Physics ; Modelling ; Natural Hazards ; Solar and Heliospheric Physics ; Solar Physics ; Solar Physics, Astrophysics, and Astronomy ; Solar wind ; Space Sciences (General) ; Space Weather ; Toruses
É parte de: Journal of geophysical research. Space physics, 2022-12, Vol.127 (12), p.e2022JA030898-n/a
Notas: GSFC
Goddard Space Flight Center
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Observations of magnetic clouds, within interplanetary coronal mass ejections (ICMEs), are often well described by flux rope models. Most of these assume either a cylindrical or toroidal geometry. In some cases, these models are also capable of accounting for non-axisymmetric cross-sections but they generally all assume axial invariance. It can be expected that any ICME, and its flux rope, will be deformed along its axis due to influences such as the solar wind. In this work, we aim to develop a writhed analytical magnetic flux rope model which would allow us to analytically describe a flux rope structure with varying curvature and torsion so that we are no longer constrained to a cylindrical or toroidal geometry. In this first iteration of our model we will solely focus on a circular cross-section of constant size. We describe our flux rope geometry in terms of a parametrized flux rope axis and a parallel transport frame. We derive expressions for the axial and poloidal magnetic field components under the assumption that the total axial magnetic flux is conserved. We find an entire class of possible solutions, which differ by the choice of integration constants, and present the results for a specific example. In general, we find that the twist of the magnetic field locally changes when the geometry deviates from a cylinder or torus. This new approach also allows us to generate completely new types of in situ magnetic field profiles which strongly deviate from those generated by cylindrical or toroidal models.
Editor: Goddard Space Flight Center: American Geophysical Union
Idioma: Inglês

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Writhed Analytical Magnetic Flux Rope Model

Weiss, A. J. ; Nieves-Chinchilla, T. ; Möstl, C. ; Reiss, M. A. ; Amerstorfer, T. ; Bailey, R. L.

Goddard Space Flight Center: American Geophysical Union

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