The magnetic structure of an earthward-moving flux rope observed by Cluster in the near-tail

Abstract. We investigate the magnetic structure of a small earthward-moving flux rope observed by Cluster in the near-Earth plasma sheet through application of the Grad-Shafranov (GS) technique to reconstruct the transverse magnetic field distribution perpendicular to the flux rope axis at X=−14.75 RE. We find that the principal axis of the flux rope lies approximately along the dawn-dusk direction and that the diameter of the flux rope is about 1.5 RE. There is a strong duskward core magnetic field in the center of the flux rope. According to the AE index, there is no obvious substorm associated with the magnetic flux rope. Recent studies indicate that the formation of the flux rope in the plasma sheet can be understood in terms of simultaneous reconnection at multiple X-line points in the near-tail. The distribution of the transverse magnetic field on the cross section is the asymmetric circles, which requires that the reconnections at multiple X-line points occur. So our results also provide additional evidence for the occurrence of multiple-X line reconnection in the magnetotail.

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Limiting behaviour of a thin plasma sheet for a transverse magnetic field

Electronics Letters ◽

10.1049/el:19660128 ◽

1966 ◽

Vol 2 (4) ◽

pp. 156

Author(s):

James R. Wait

Keyword(s):

Magnetic Field ◽

Transverse Magnetic Field ◽

Plasma Sheet ◽

Transverse Magnetic ◽

Limiting Behaviour ◽

Thin Plasma

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Effects of transverse magnetic field upon the temperature distribution, cross-section shape, and profile of a cross-flow arc

10.2514/6.1970-777 ◽

1970 ◽

Author(s):

A. BAKER

Keyword(s):

Magnetic Field ◽

Temperature Distribution ◽

Cross Section ◽

Transverse Magnetic Field ◽

Cross Flow ◽

Transverse Magnetic ◽

Cross Section Shape ◽

Section Shape

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Magnetic structure and dispersion relation of the S=12 quasi-one-dimensional Ising-like antiferromagnet BaCo2V2O8 in a transverse magnetic field

Physical Review B ◽

10.1103/physrevb.96.024439 ◽

2017 ◽

Vol 96 (2) ◽

Cited By ~ 5

Author(s):

M. Matsuda ◽

H. Onishi ◽

A. Okutani ◽

J. Ma ◽

H. Agrawal ◽

...

Keyword(s):

Magnetic Field ◽

Dispersion Relation ◽

Magnetic Structure ◽

Transverse Magnetic Field ◽

Transverse Magnetic ◽

One Dimensional

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The spatial relation between EUV cavities and linear polarization signatures

Proceedings of the International Astronomical Union ◽

10.1017/s1743921313011253 ◽

2013 ◽

Vol 8 (S300) ◽

pp. 395-396 ◽

Cited By ~ 2

Author(s):

Urszula Bak-Stȩślicka ◽

Sarah E. Gibson ◽

Yuhong Fan ◽

Christian Bethge ◽

Blake Forland ◽

...

Keyword(s):

Magnetic Field ◽

Magnetic Flux ◽

Cross Section ◽

Linear Polarization ◽

Flux Rope ◽

Spatial Relation ◽

Coronal Magnetic Field ◽

Systematic Analysis ◽

Elliptical Cross ◽

Magnetic Flux Rope

AbstractSolar coronal cavities are regions of rarefied density and elliptical cross-section. The Coronal Multi-channel Polarimeter (CoMP) obtains daily full-Sun coronal observations in linear polarization, allowing a systematic analysis of the coronal magnetic field in polar-crown prominence cavities. These cavities commonly possess a characteristic “lagomorphic” signature in linear polarization that may be explained by a magnetic flux-rope model. We analyze the spatial relation between the EUV cavity and the CoMP linear polarization signature.

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Optimum power generation from a moving plasma

Journal of Fluid Mechanics ◽

10.1017/s0022112060001493 ◽

1960 ◽

Vol 7 (2) ◽

pp. 287-301 ◽

Cited By ~ 22

Author(s):

Joseph L. Neuringer

Keyword(s):

Magnetic Field ◽

Cross Section ◽

Transverse Magnetic Field ◽

Fusion Reaction ◽

Transverse Magnetic ◽

External Loading ◽

One Dimensional ◽

Dimensional Flow ◽

Special Cases ◽

Moving Plasma

The possibility exists of directly using the plasma, resulting from a controlled fusion reaction, to generate electricity by electromagnetic induction. Two special cases of a more general problem are considered here: (1)the extraction of optimum power from the steady one-dimensional flow of an incompressible inviscid plasma across a uniform transverse magnetic field in an externally loaded channel of arbitrarily varying cross-section, and (2) the extraction of optimum power from the steady one-dimensional flow of a compressible inviscid plasma across a uniform transverse magnetic field in a channel of uniform cross-section. In each case, the magnitude of the required external loading at optimum power operation is determined as a function of the parameters which characterize the hydromagnetic interaction. Also determined are the magnitudes of the terminal voltate, power, fluid mechanical to electrical conversion efficiency, and the variation of the fluid dynamical variables along the channel at optimum power.

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Approximate formula for the eddy-current loss induced in a long conductor of rectangular cross-section by a transverse magnetic field

Proceedings of the Institution of Electrical Engineers ◽

10.1049/piee.1969.0186 ◽

1969 ◽

Vol 116 (6) ◽

pp. 1003 ◽

Cited By ~ 4

Author(s):

R.L. Stoll

Keyword(s):

Magnetic Field ◽

Cross Section ◽

Transverse Magnetic Field ◽

Eddy Current ◽

Approximate Formula ◽

Rectangular Cross Section ◽

Transverse Magnetic ◽

Eddy Current Loss ◽

Current Loss

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Cluster observations of a transient signature in the magnetotail: implications for the mode of reconnection

Annales Geophysicae ◽

10.5194/angeo-29-2131-2011 ◽

2011 ◽

Vol 29 (11) ◽

pp. 2131-2146 ◽

Cited By ~ 4

Author(s):

S. Beyene ◽

C. J. Owen ◽

A. P. Walsh ◽

C. Forsyth ◽

A. N. Fazakerley ◽

...

Keyword(s):

Magnetic Field ◽

Magnetic Structure ◽

Plasma Sheet ◽

Flux Rope ◽

Drop Out ◽

Neutral Sheet ◽

Ion Flow ◽

Drop Outs ◽

Cluster 2 ◽

Space Variant

Abstract. Travelling compression regions (TCRs) are perturbations in the magnetotail lobe magnetic field caused by structures moving Earthward or tailward within the plasma sheet. Previous works have suggested that these structures are created by either time-dependant reconnection occurring at a single X-line, forming a flux-bulge-type structure, or space-variant reconnection at multiple X-lines, forming flux-rope-type structures. In this study we examine an event in which Cluster 2 observed a TCR while the 3 remaining Cluster spacecraft observed the underlying magnetic structure at a range of distances from the neutral sheet. The magnetic structure has a velocity of (99, 154, −31) km s−1 in GSM (&vert;V&vert; = 186 km s−1), an estimated size of 1.19 RE along the direction of travel and a size between 1.94 and 2.86 RE in the direction perpendicular to the current sheet. As the structure passes the spacecraft, Cluster 1 and Cluster 4 observed a bipolar signature in BZ, plasma-sheet-like plasma and field-aligned electron flows. Cluster 3 passed closest to the centre of the structure and observed two separate reductions in the plasma density (with field-aligned electron flows); these drop-outs in the plasma sheet were possibly created by the actions of X-lines. The second drop-out in the plasma sheet also includes a reversal of the ion flow, a signature consistent with the passage of a reconnecting X-line past the spacecraft. Between the X-lines, the plasma outflow from the X-lines caused an increase in pressure which led to a localised expansion of the plasma and also the observations at Cluster 1 and Cluster 4 and the TCR. Our observations do not uniquely match either of the flux rope or the flux bulge predictions although the observation of two plasma sheet drop-outs (interpreted as X-lines, one active, one dormant) with plasma-sheet-like between them and only one TCR is a situation expected in multiple X-line reconnection.

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