Particle scattering and current sheet stability in the geomagnetic tail during the substorm growth phase

1992 ◽  
Vol 97 (A12) ◽  
pp. 19283 ◽  
Author(s):  
T. I. Pulkkinen ◽  
D. N. Baker ◽  
R. J. Pellinen ◽  
J. Büchner ◽  
H. E. J. Koskinen ◽  
...  
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Particle Scattering ◽  
Geomagnetic Tail

Global and local processes of thin current sheet formation during substorm growth phase

2021 ◽  
pp. 105671
Author(s):  
A. Runov ◽  
V. Angelopoulos ◽  
A.V. Artemyev ◽  
J.M. Weygand ◽  
S. Lu ◽  
...  
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Thin Current Sheet ◽  
Global And Local

Growth-phase thinning of the near-Earth current sheet during the CDAW 6 substorm

1994 ◽  
Vol 99 (A4) ◽  
pp. 5805 ◽  
Author(s):  
Jeff Sanny ◽  
R. L. McPherron ◽  
C. T. Russell ◽  
D. N. Baker ◽  
T. I. Pulkkinen ◽  
...  
Keyword(s):  
Current Sheet ◽  
Growth Phase

scholarly journals Global properties of magnetotail current sheet flapping: THEMIS perspectives

2009 ◽  
Vol 27 (1) ◽  
pp. 319-328 ◽  
Author(s):  
A. Runov ◽  
V. Angelopoulos ◽  
V. A. Sergeev ◽  
K.-H. Glassmeier ◽  
U. Auster ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Growth Phase ◽  
Timing Analysis ◽  
Wave Length ◽  
Global Properties ◽  
The Cross ◽  
Magnetic Field Variations ◽  
The Magnetic Field ◽  
Magnetotail Current Sheet

Abstract. A sequence of magnetic field oscillations with an amplitude of up to 30 nT and a time scale of 30 min was detected by four of the five THEMIS spacecraft in the magnetotail plasma sheet. The probes P1 and P2 were at X=−15.2 and −12.7 RE and P3 and P4 were at X=−7.9 RE. All four probes were at −6.5>Y>−7.5 RE (major conjunction). Multi-point timing analysis of the magnetic field variations shows that fronts of the oscillations propagated flankward (dawnward and Earthward) nearly perpendicular to the direction of the magnetic maximum variation (B1) at velocities of 20–30 km/s. These are typical characteristics of current sheet flapping motion. The observed anti-correlation between ∂B1/∂t and the Z-component of the bulk velocity make it possible to estimate a flapping amplitude of 1 to 3 RE. The cross-tail scale wave-length was found to be about 5 RE. Thus the flapping waves are steep tail-aligned structures with a lengthwise scale of >10 RE. The intermittent plasma motion with the cross-tail velocity component changing its sign, observed during flapping, indicates that the flapping waves were propagating through the ambient plasma. Simultaneous observations of the magnetic field variations by THEMIS ground-based magnetometers show that the flapping oscillations were observed during the growth phase of a substorm.

Current carriers in the near-Earth cross-tail current sheet during substorm growth phase

1990 ◽  
Vol 17 (5) ◽  
pp. 583-586 ◽  
Author(s):  
D. G. Mitchell ◽  
D. J. Williams ◽  
C. Y. Huang ◽  
L. A. Frank ◽  
C. T. Russell
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Tail Current

Three spacecraft observations of the geomagnetic tail during moderately disturbed conditions: Structure and evolution of the current sheet

1997 ◽  
Vol 102 (A7) ◽  
pp. 14415-14424 ◽  
Author(s):  
X.‐Y. Zhou ◽  
C. T. Russell ◽  
J. T. Gosling ◽  
D. G. Mitchell
Keyword(s):  
Current Sheet ◽  
Geomagnetic Tail

scholarly journals Two-dimensional current-carrying plasma sheet in the near-Earth geomagnetic tail region:a quasi-stationary evolution

2003 ◽  
Vol 21 (12) ◽  
pp. 2259-2269 ◽  
Author(s):  
A. V. Manankova
Keyword(s):  
Current Sheet ◽  
Plasma Sheet ◽  
Geomagnetic Field ◽  
Exact Analytical Solution ◽  
Current System ◽  
Field Configuration ◽  
Transitional Region ◽  
Two Dimensional ◽  
Geomagnetic Tail ◽  
Magnetospheric Configuration And Dynamics

Abstract. A problem concerning stationary configurations of an inhomogeneous, current-carrying, two-dimensional plasma sheet as the solution of the Grad–Shafranov equation with boundary conditions given on cross-sheet profiles at the  foot of the sheet and at infinity is considered, with the aim of using its solution for the description of the interaction of two current systems: the current system of the geomagnetic field, and the tail currents. The obtained solution is an exact analytical solution which contains 5 independent parameters characterizing the intensity of the current sheet. As the solution is exact, it may be applied to describe the most interesting transitional magnetospheric region: that of a strong interaction between the magnetic fields of the geodipole and of the current sheet, i.e. the region where characteristic scales of the change of all variables along and across the sheet are of the same order. This makes it possible to model the structure of the transitional region and its dynamics under quasi-stationary variation of the input parameters. The obtained solution describes the principal processes developing at various phases of magnetospheric disturbances, such as (1) formation of a very intense thin current sheet localized within the transition region, (2) changing from the quasi-dipolar magnetic field to the configuration when a "neck" is formed in this region. An important feature of the obtained solution is the existence of a critical value of one of the parameters of the problem, which leads to the change in the geomagnetic field configuration described above. The solution can be used as an initial condition in simulating dynamical processes in the magnetotail current sheet, as well as in testing the current sheet stability. In the summary a series of limitations in the model problem under consideration is discussed. Key words. Magnetospheric physics (magnetotail; plasma sheet; magnetospheric configuration and dynamics)

Electron flat-top distributions and cross-scale wave modulations observed in the current sheet of geomagnetic tail

2017 ◽  
Vol 24 (8) ◽  
pp. 082903 ◽  
Author(s):  
Duo Zhao ◽  
Suiyan Fu ◽  
George K. Parks ◽  
Weijie Sun ◽  
Qiugang Zong ◽  
...  
Keyword(s):  
Current Sheet ◽  
Geomagnetic Tail

Current sheet thickness in the near-Earth plasma sheet during substorm growth phase

1990 ◽  
Vol 95 (A4) ◽  
pp. 3819 ◽  
Author(s):  
V. A. Sergeev ◽  
P. Tanskanen ◽  
K. Mursula ◽  
A. Korth ◽  
R. C. Elphic
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Plasma Sheet ◽  
Sheet Thickness
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