Magnetic Reconnection for Southward and Northward IMF- Coordinate Observations by TC1 and Cluster on Feb.13, 2004

Details Magnetic Reconnection for Southward and Northward IMF- Coordinate Observations by TC1 and Cluster on Feb.13, 2004 Magnetic Reconnection for Southward and Northward IMF- Coordinate Observations by TC1 and Cluster on Feb.13, 2004

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31a1205p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM31A-1205

Physics

7835 Magnetic Reconnection, 2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath

Scientific paper

From 04:40 to 05:20 UT on Feb. 13, 2004, the TC1 satellite of Chinese-ESA joint Double Star Mission was located in the dayside magnetopause boundary near the equator, its GSM position was (9.5, 4.1, -0.4) RE; in the mean time the Cluster four spacecraft were traversing the southern high-latitude magnetopause region, with GSM coordinates being (7.5, 1.8, -10.2) RE. During this time interval, TC1 encountered with the magnetopause four times, the spacecraft saw two magnetic reconnection (MR) events for southward IMF, and two MR events for northward IMF; meanwhile Cluster observed a southward IMF MR and a northward IMF MR phenomenon. A preliminary analysis of these events is made in the present paper. The results are briefly summarized as follows: (1) All MR events are found to be of AƒÆ'A+â_TAƒâ_sA,AøAƒÆ'A,AøAƒAøAøâ_sA¬A.A¡Aƒâ_sA,A¬AƒÆ'Aøâ,¬A¦AƒAøAøâ_sA¬A.â_oComponent ReconnectionAƒÆ'A+â_TAƒâ_sA,AøAƒÆ'A,AøAƒAøAøâ_sA¬A.A¡Aƒâ_sA,A¬ type. In the northward IMF BZ cases a noticeably negative IMF BY component is present. (2) In southward IMF BZ cases, TC1 saw a FTE flux rope and a high-speed plasma flow in the magnetospheric low-latitude boundary layer (LLBL) in each event; while Cluster found a AƒÆ'A+â_TAƒâ_sA,AøAƒÆ'A,AøAƒAøAøâ_sA¬A.A¡Aƒâ_sA,A¬AƒÆ'Aøâ,¬A¦AƒAøAøâ_sA¬A.â_omagnetospheric FTEAƒÆ'A+â_TAƒâ_sA,AøAƒÆ'A,AøAƒAøAøâ_sA¬A.A¡Aƒâ_sA,A¬ flux rope in high-latitudes. (3) For southward IMF, the reconnection structures measured by Cluster in high-latitudes and TC1 in low-latitudes were both originated from the MR process near the dayside equator. (4) In northward IMF BZ cases, the MR phenomenon observed by TC1 near the dayside equatorial plane seems to be closely related to the presence of a noticeable IMF BY. In the two events observed the X-line probably was passing through somewhere between the dayside equatorial magnetopause and the cusp region. For the 04:46-04:49 (UT) event, MR seemed to occur northward of TC1; while for the 05:16-05:18 (UT) event, MR possibly took place southward of the TC1 and northward of Cluster. (5) MR for northward IMF BZ may play a role in the formation of the LLBL and the magnetosheath boundary layer (MSBL).

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