The substorm current wedge in MHD simulations

2013 ◽  
Vol 118 (6) ◽  
pp. 3364-3376 ◽  
Author(s):  
J. Birn ◽  
M. Hesse
Keyword(s):  
Substorm Current Wedge ◽  
Mhd Simulations ◽  
Current Wedge

scholarly journals Network community structure of substorms using SuperMAG magnetometers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
L. Orr ◽  
S. C. Chapman ◽  
J. W. Gjerloev ◽  
W. Guo
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Easy Access ◽  
Directed Network ◽  
Coherent System ◽  
Dimensional System ◽  
Ionospheric Currents ◽  
Substorm Current Wedge ◽  
Spatially Extended ◽  
Current Wedge

AbstractGeomagnetic substorms are a global magnetospheric reconfiguration, during which energy is abruptly transported to the ionosphere. Central to this are the auroral electrojets, large-scale ionospheric currents that are part of a larger three-dimensional system, the substorm current wedge. Many, often conflicting, magnetospheric reconfiguration scenarios have been proposed to describe the substorm current wedge evolution and structure. SuperMAG is a worldwide collaboration providing easy access to ground based magnetometer data. Here we show application of techniques from network science to analyze data from 137 SuperMAG ground-based magnetometers. We calculate a time-varying directed network and perform community detection on the network, identifying locally dense groups of connections. Analysis of 41 substorms exhibit robust structural change from many small, uncorrelated current systems before substorm onset, to a large spatially-extended coherent system, approximately 10 minutes after onset. We interpret this as strong indication that the auroral electrojet system during substorm expansions is inherently a large-scale phenomenon and is not solely due to many meso-scale wedgelets.

scholarly journals Relative contributions of large-scale and wedgelet currents in the substorm current wedge

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Y. Nishimura ◽  
L. R. Lyons ◽  
C. Gabrielse ◽  
J. M. Weygand ◽  
E. F. Donovan ◽  
...  
Keyword(s):  
Large Scale ◽  
Substorm Current Wedge ◽  
Current Wedge

scholarly journals Coupling between Mercury and its nightside magnetosphere: Cross-tail current sheet asymmetry and substorm current wedge formation

2017 ◽  
Vol 122 (8) ◽  
pp. 8419-8433 ◽  
Author(s):  
Gangkai Poh ◽  
James A. Slavin ◽  
Xianzhe Jia ◽  
Jim M. Raines ◽  
Suzanne M. Imber ◽  
...  
Keyword(s):  
Current Sheet ◽  
Substorm Current Wedge ◽  
Tail Current ◽  
Current Wedge
Sign in / Sign up

Export Citation Format

Share Document