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Titel |
The Kinetic Scale Structure of the Low Latitude Boundary Layer: Initial MMS Results |
VerfasserIn |
John Dorelli, Dan Gershman, Levon Avanov, Craig Pollock, Barbara Giles, Ulrik Gliese, Alexander Barrie, Matthew Holland, Chad Salo, Charles Dickson, Victoria Coffey, Michael Chandler, Yoshifumi Sato, Robert Strangeway, Christopher Russell, Wolfgang Baumjohann, Yuri Khotyainstev, Roy Torbert, James Burch |
Konferenz |
EGU General Assembly 2016
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 18 (2016) |
Datensatznummer |
250122873
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Publikation (Nr.) |
EGU/EGU2016-2009.pdf |
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Zusammenfassung |
Since its launch in March of 2015, NASA’s Magnetospheric Multiscale (MMS) mission has
captured thousands of high resolution magnetopause crossings, routinely resolving the
sub-Larmor radius structure of the magnetopause boundary layer for the first time. The
primary goal of MMS is to understand the microphysics of magnetic reconnection, and it is
well on its way to achieving this objective. However, MMS is also making routine
measurements of the electron and ion gyroviscous and heat flux tensors with unprecedented
resolution and accuracy. This opens up the possibility of directly observing the physical
processes that facilitate momentum and energy transport across the magnetopause boundary
layer under arbitrary conditions (e.g., magnetic field geometry and flow shear) far from
the reconnection X line. Currently, our global magnetosphere fluid models (e.g.,
resistive or Hall MHD) do not include accurate descriptions of viscosity and heat flow,
both of which are known to be critical players at the magnetopause (not just at the
reconnection sites), and several groups are attempting to make progress on this difficult
fluid closure problem. In this talk, we will address the fluid closure problem in
the context of MMS observations of the Low Latitude Boundary Layer (LLBL),
focusing on high resolution particle observations by the Fast Plasma Investigation
(FPI). FPI electron bulk velocities are accurate enough to compute current density in
both the high density magnetosheath and low density magnetosphere and have
already revealed that the LLBL has a complex parallel current structure on the proton
Larmor radius scale. We discuss the relationship between these parallel currents and
the Hall electric field structures predicted by kinetic models. We also present first
observations of the ion and electron gyroviscous and heat flux tensors in the LLBL
and discuss implications for the fluid closure problem at Earth’s magnetopause. |
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