Journal
EARTH PLANETS AND SPACE
Volume 69, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s40623-017-0707-2
Keywords
Substorm; Dipolarization; Plasma sheet boundary layer; Field-aligned current
Categories
Funding
- Austrian Science Fund (FWF) [I2016-N20]
- NASA [NNX13AD10G, NNX13AD21G]
- NSF [1203711, 160265]
- NASA [475794, NNX13AD10G, NNX13AD21G, 475734] Funding Source: Federal RePORTER
- Austrian Science Fund (FWF) [I2016] Funding Source: Austrian Science Fund (FWF)
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1602655] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1420184] Funding Source: National Science Foundation
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We report on the large-scale evolution of dipolarization in the near-Earth plasma sheet during an intense (AL similar to -1000 nT) substorm on August 10, 2016, when multiple spacecraft at radial distances between 4 and 15 RE were present in the night-side magnetosphere. This global dipolarization consisted of multiple short-timescale (a couple of minutes) Bz disturbances detected by spacecraft distributed over 9 MLT, consistent with the large-scale substorm current wedge observed by ground-based magnetometers. The four spacecraft of the Magnetospheric Multiscale were located in the southern hemisphere plasma sheet and observed fast flow disturbances associated with this dipolarization. The high-time-resolution measurements from MMS enable us to detect the rapid motion of the field structures and flow disturbances separately. A distinct pattern of the flow and field disturbance near the plasma boundaries was found. We suggest that a vortex motion created around the localized flows resulted in another fieldaligned current system at the off-equatorial side of the BBF-associated R1/R2 systems, as was predicted by the MHD simulation of a localized reconnection jet. The observations by GOES and Geotail, which were located in the opposite hemisphere and local time, support this view. We demonstrate that the processes of both Earthward flow braking and of accumulated magnetic flux evolving tailward also control the dynamics in the boundary region of the near-Earth plasma sheet.
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