Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States

T Wiegelmann; K Schindler; Thomas Neukirch

Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States

T Wiegelmann, K Schindler, Thomas Neukirch

Applied Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

Recent observations of the solar corona with the LASCO coronagraph on board the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution structure are presented.

Original language	English
Pages (from-to)	p.439-460.
Number of pages	22
Journal	Solar Physics
Volume	180
Issue number	1/2
Publication status	Published - Jun 1998

Keywords

SOLAR ERUPTIVE PROCESSES
CONDUCTIVE MAGNETOHYDRODYNAMIC FLOWS
FIELD-ALIGNED FLOW
CORONAL STRUCTURES
ONSET CONDITIONS
CURRENT SHEETS
MAGNETOTAIL
EQUILIBRIA
MODEL
SYSTEM

Cite this

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title = "Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States",

abstract = "Recent observations of the solar corona with the LASCO coronagraph on board the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution structure are presented.",

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author = "T Wiegelmann and K Schindler and Thomas Neukirch",

year = "1998",

month = jun,

language = "English",

volume = "180",

pages = "p.439--460.",

journal = "Solar Physics",

issn = "0038-0938",

publisher = "Springer",

number = "1/2",

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TY - JOUR

T1 - Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States

AU - Wiegelmann, T

AU - Schindler, K

AU - Neukirch, Thomas

PY - 1998/6

Y1 - 1998/6

N2 - Recent observations of the solar corona with the LASCO coronagraph on board the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution structure are presented.

AB - Recent observations of the solar corona with the LASCO coronagraph on board the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution structure are presented.

KW - SOLAR ERUPTIVE PROCESSES

KW - CONDUCTIVE MAGNETOHYDRODYNAMIC FLOWS

KW - FIELD-ALIGNED FLOW

KW - CORONAL STRUCTURES

KW - ONSET CONDITIONS

KW - CURRENT SHEETS

KW - MAGNETOTAIL

KW - EQUILIBRIA

KW - MODEL

KW - SYSTEM

UR - http://www.scopus.com/inward/record.url?scp=0032374429&partnerID=8YFLogxK

M3 - Article

SN - 0038-0938

VL - 180

SP - p.439-460.

JO - Solar Physics

JF - Solar Physics

IS - 1/2

ER -

Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States

Abstract

Keywords

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