Low-latitude dayside magnetopause and boundary layer for high magnetic shear: 1. Structure and motion

1996 ◽  
Vol 101 (A4) ◽  
pp. 7801-7815 ◽  
Author(s):  
Tai D. Phan ◽  
Götz Paschmann
Keyword(s):  
Boundary Layer ◽  
Low Latitude ◽  
Magnetic Shear ◽  
Structure And Motion ◽  
Dayside Magnetopause

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

2005 ◽  
Vol 23 (8) ◽  
pp. 2889-2895 ◽  
Author(s):  
Z. Y. Pu ◽  
C. J. Xiao ◽  
X. G. Zhang ◽  
Z. Y. Huang ◽  
S. Y. Fu ◽  
...  
Keyword(s):  
Double Star ◽  
Flow Reversal ◽  
Low Latitude ◽  
Magnetic Shear ◽  
Guide Field ◽  
Dayside Magnetopause ◽  
Preliminary Study ◽  
Reconnection Site ◽  
Quadrupolar Field

Abstract. 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.

scholarly journals Coordinated Cluster/Double Star observations of dayside reconnection signatures

2005 ◽  
Vol 23 (8) ◽  
pp. 2867-2875 ◽  
Author(s):  
M. W. Dunlop ◽  
M. G. G. T. Taylor ◽  
J. A. Davies ◽  
C. J. Owen ◽  
F. Pitout ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Boundary Layer ◽  
Double Star ◽  
Low Latitude ◽  
Flux Transfer Events ◽  
Reconnection Region ◽  
Dayside Magnetopause ◽  
First Results ◽  
North And South ◽  
Imf Clock Angle

Abstract. The recent launch of the equatorial spacecraft of the Double Star mission, TC-1, has provided an unprecedented opportunity to monitor the southern hemisphere dayside magnetopause boundary layer in conjunction with northern hemisphere observations by the quartet of Cluster spacecraft. We present first results of one such situation where, on 6 April 2004, both Cluster and the Double Star TC-1 spacecraft were on outbound transits through the dawnside magnetosphere. The observations are consistent with ongoing reconnection on the dayside magnetopause, resulting in a series of flux transfer events (FTEs) seen both at Cluster and TC-1, which appear to lie north and south of the reconnection line, respectively. In fact, the observed polarity and motion of each FTE signature advocates the existence of an active reconnection region consistently located between the positions of Cluster and TC-1, with Cluster observing northward moving FTEs with +/- polarity, whereas TC-1 sees -/+ polarity FTEs. This assertion is further supported by the application of a model designed to track flux tube motion for the prevailing interplanetary conditions. The results from this model show, in addition, that the low-latitude FTE dynamics are sensitive to changes in convected upstream conditions. In particular, changing the interplanetary magnetic field (IMF) clock angle in the model suggests that TC-1 should miss the resulting FTEs more often than Cluster and this is borne out by the observations.

Low-latitude dusk flank magnetosheath, magnetopause, and boundary layer for low magnetic shear: Wind observations

1997 ◽  
Vol 102 (A9) ◽  
pp. 19883-19895 ◽  
Author(s):  
T. D. Phan ◽  
D. Larson ◽  
J. McFadden ◽  
R. P. Lin ◽  
C. Carlson ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Low Latitude ◽  
Magnetic Shear

Energetic Particle Observations in the Low-Latitude Boundary Layer

1985 ◽  
Vol 90 (A6) ◽  
pp. 5097 ◽  
Author(s):  
D. J. Williams ◽  
D. G. Mitchell ◽  
T. E. Eastman ◽  
L. A. Frank
Keyword(s):  
Boundary Layer ◽  
Energetic Particle ◽  
Low Latitude ◽  
Low Latitude Boundary Layer
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