scholarly journals On the use of photometer data to map dynamics of the magnetotail current sheet during substorm growth phase

2000 ◽  
Vol 105 (A12) ◽  
pp. 27673-27684 ◽  
Author(s):  
J. A. Wanliss ◽  
J. C. Samson ◽  
E. Friedrich
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Magnetotail Current Sheet

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.

scholarly journals Detecting near-tail current sheet formation using isotropic boundaries: lessons from global MHD.

2020 ◽  
Author(s):  
E.I. Gordeev ◽  
Keyword(s):  
Current Sheet ◽  
Growth Phase ◽  
Energetic Particles ◽  
Lessons Learned ◽  
Mhd Simulation ◽  
Tail Current ◽  
Different Types ◽  
Global Mhd Simulation ◽  
Orbiting Spacecraft ◽  
Magnetotail Current Sheet

A number of recent studies suggests an existence of magnetotail current sheet configurations with tailward Bz gradient during the growth phase of the substorm. Such configurations are especially interesting since they are potentially unstable for different types of instabilities and can lead to explosive reconfiguration of the magnetosphere. However, the observations are rare and ability to observe tailward gradients is very limited. Here we use the global MHD configuration with near-tail Bz minimum to investigate the regions with adiabatic and non-adiabatic behavior of energetic particles. Thus we estimate the locations of the isotropic boundaries for the modelled POES-type spacecraft flybys. We expect that the lessons learned from global MHD simulation may become helpful in exploration of non-monotonic tail current sheet configuration using observations on low-orbiting spacecraft.

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

Understanding magnetotail current sheet meso-scale structures using MHD simulations

2008 ◽  
Vol 41 (10) ◽  
pp. 1630-1642 ◽  
Author(s):  
Mostafa El-Alaoui ◽  
Maha Ashour-Abdalla ◽  
Jean Michel Bosqued ◽  
Robert L. Richard
Keyword(s):  
Current Sheet ◽  
Mhd Simulations ◽  
Scale Structures ◽  
Meso Scale ◽  
Magnetotail Current Sheet

scholarly journals Physical Implication of Two Types of Reconnection Electron Diffusion Regions With and Without Ion‐Coupling in the Magnetotail Current Sheet

2020 ◽  
Vol 47 (21) ◽  
Author(s):  
Rongsheng Wang ◽  
Quanming Lu ◽  
San Lu ◽  
Christopher T. Russell ◽  
J. L. Burch ◽  
...  
Keyword(s):  
Current Sheet ◽  
Electron Diffusion ◽  
Physical Implication ◽  
Magnetotail Current Sheet

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
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