Inferring the Magnetotail reconnection model from its magnetic products
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Inferring the Magnetotail reconnection model from its magnetic products. Authors: S. Beyene 1 , C.J. Owen 1 , A.P. Walsh 1 , A.N. Fazakerley 1 , E. Lucek 2 , I. Dandouras 3 1 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT, UK

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Inferring the Magnetotail reconnection model from its magnetic products

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Inferring the magnetotail reconnection model from its magnetic products

Inferring the Magnetotail reconnection model from its magnetic products

Authors: S. Beyene1, C.J. Owen1, A.P. Walsh1, A.N. Fazakerley1, E. Lucek2, I. Dandouras3

1Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT, UK

2Space and Atmospheric Physics, Imperial College London, SW7 2BZ, UK3Centre d’Etude Spatiale des Rayonnements, Toulouse, France


Inferring the magnetotail reconnection model from its magnetic products

  • Motivation

  • The details of magnetic reconnection are not fully known.

  • Reconnection creates magnetic structures which have been observed.

  • There are two competing models each predicting a magnetic structure (MXR and time dependant reconnection).

  • By studying the magnetic structure, the correct model can be inferred (whether it be either, a hybrid or neither).

  • We seek a crossing when spacecraft separation was similar to the size of these structures (~1.5RE, 2006 Tail Season, spacecraft 10,000km separation).

  • Varied ‘impact parameters’ (unitless radial distance) one spacecraft outside, one near the centre and the other two at various distances inside the magnetic structure.


Inferring the magnetotail reconnection model from its magnetic products

Multiple X-Line Reconnection

  • Distance Dependant

  • Multiple X lines present

  • Flux ropes created between X-Lines

  • Fastest X-Line

  • Bipolar signature


Inferring the magnetotail reconnection model from its magnetic products

Time Dependant Reconnection

"from Kiehas et al., 2009"

  • One X Line, two flux bulges

  • MHD waves propagate from X-Line

  • outflow tear drop shaped

  • Uneven bipolar, plasma in second half


Inferring the magnetotail reconnection model from its magnetic products

Data Search

The Cluster data was searched to find a magnetic structure (in the tail) to analyse in the hopes of inferring the reconnection model.


Inferring the magnetotail reconnection model from its magnetic products

Orbit Plot Relative to C3

  • In the Magnetotail

  • Tetrahedral formation

  • C3 far south


Inferring the magnetotail reconnection model from its magnetic products

  • Spacecraft located in the magnetolobe

  • Small, long lasting bipolar signature (compared to C1 and C4)

  • Small increase in energy, density, pressure, temperature and velocity

  • Event is consistent with a TCR (Travelling Compression Region)


Inferring the magnetotail reconnection model from its magnetic products

  • Bipolar signature seen in Bz as well as a dip in Bx

  • 0 and 180 degree pitch angle particles see a greater increase in DEF


Inferring the magnetotail reconnection model from its magnetic products

  • Spacecraft crosses from plasma sheet to structure and back out into the plasma sheet

  • No bipolar signature

  • -ve Bx indicating a crossing of the neutral sheet

  • Can be explained by the movement of the plasma sheet or by a magnetic structure


Inferring the magnetotail reconnection model from its magnetic products

Possible Interpretations: Flux Rope


Inferring the magnetotail reconnection model from its magnetic products

Possible Interpretations: Flux Bulge


Inferring the magnetotail reconnection model from its magnetic products

Possible Interpretations: Wave


Inferring the magnetotail reconnection model from its magnetic products

  • Summary

  • Magnetic structures were searched for in the Cluster dataset, at a time when the spacecraft separation was close to the size of the magnetic structure.

  • The event studied had the spacecraft at significantly different impact parameters.

  • By analysing the structure, the reconnection model can be studied.

  • Two reconnection models exist, both predicting different magnetic structures.

  • By comparing the observed magnetic structure to the two theoretical magnetic structures, the reconnection model can be inferred

  • Observed event more consistent with a plasma sheet wave

  • [email protected]


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