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Annales Geophysicae 23, 8 (2005) 2889-2895

Double Star TC-1 observations of component reconnection at the dayside magnetopause: a preliminary study

Z. Y. Pu 1, 2, C. J. Xiao 3, X. G. Zhang 1, Z. Y. Huang 1, S. Y. Fu 1, Z. X. Liu 2, M. W. Dunlop 4, Q. G. Zong 5, C. M. Carr 6, H. Réme 7, I. Dandouras 7, A. Fazakerley 8, T. Phan 9, T. L. Zhang 10, H. Zhang 1, X. G. Wang 11

(08/11/2005)

In spring 2004 Double Star TC-1 measured a number of reconnection signatures at the dayside low-latitude magnetopause (MP) when there was a notable By component in the magnetosheath. In a number of events we can show that reconnection was operating nearby TC-1 in the subsolar MP region. In this paper we describe three representative events: (a) event on 21 March 2004 in which the reconnection site can be remotely monitored, the spacecraft was passing by the X-line; (b) event on 12 March 2004 in which TC-1 observed the magnetospheric part of the quadrupolar field, together with a consistent flow reversal; (c) event on 26 March 2004 which occurred for northward IMF, TC-1 observed a reversal of vy across the equatorial MP. In these events the shear angles across the MP were considerably smaller than 180°; a noticeable guide field was present. These observations are consistent with near equatorial component merging, suggesting that component reconnection preferably occurs at the dayside low-latitude MP. There is evidence that when a pronounced magnetic shear across the MP exists in the By component, reconnection may operate at the dayside low-latitude MP for northward IMF Bz.

1 :	School of Earth and Space Sciences
	School of Earth and Space Sciences
2 :	Center for Space Science and Applied Research
	Center for Space Science and Applied Research
3 :	National Astronomical Observatories
	National Astronomical Observatories
4 :	Space Science and Technology Department (Ral Space)
	STFC Rutherford Appleton Laboratory
5 :	Center for Space Physics
	Boston University
6 :	SAPG
	The Blackett Laboratory
7 :	Centre d'étude spatiale des rayonnements (CESR)
	CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
8 :	Mullard Space Science Laboratory
	Mullard Space Science Laboratory
9 :	Space Science Laboratory
	University of California Berkeley
10 :	Space Research Institute
	Austrian Academy of Sciences
11 :	Center for Plasma Physics
	Center for Plasma Physics

Domaine

:

Planète et Univers/Océan, Atmosphère Planète et Univers/Sciences de la Terre

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Soumis le : Mardi 8 Novembre 2005, 08:00:00

Dernière modification le : Vendredi 10 Octobre 2008, 16:02:32