scholarly journals Magnetospheric Multiscale Observations of the Off-equatorial Dipolarization Front Dynamics in the Terrestrial Magnetotail

2020 ◽  
Vol 899 (2) ◽  
pp. 125
Author(s):  
Huimin Li ◽  
Congkuan Zhu ◽  
Lixin Guo ◽  
Qi Cheng ◽  
O. Le Contel
Keyword(s):  
Dipolarization Front ◽  
Magnetospheric Multiscale ◽  
Front Dynamics

scholarly journals A New Perspective for Dipolarization Front Dynamics: Electromagnetic Effects of Velocity Inhomogeneity

2019 ◽  
Vol 124 (9) ◽  
pp. 7533-7542 ◽  
Author(s):  
Dong Lin ◽  
Wayne A. Scales ◽  
Gurudas Ganguli ◽  
Xiangrong Fu ◽  
Chris Crabtree ◽  
...  
Keyword(s):  
Dipolarization Front ◽  
Electromagnetic Effects ◽  
New Perspective ◽  
Front Dynamics

MMS-Cluster conjugate observation of disturbance in the current sheet associated with localized fast flow in the near-Earth magnetotail

2020 ◽  
Author(s):  
Rumi Nakamura ◽  
Wolfgang Baumjohann ◽  
Joachim Birn ◽  
Jim Burch ◽  
Chris Carr ◽  
...  
Keyword(s):  
Current Sheet ◽  
Equatorial Region ◽  
Small Scale ◽  
Dipolarization Front ◽  
Magnetospheric Multiscale ◽  
Statistical Studies ◽  
Point Data ◽  
Fast Flow ◽  
Magnetotail Dynamics

<p>We report the evolution of the current sheet associated with a localized flow burst in the near-Earth magnetotail on Sep. 8, 2018 around 14 UT when MMS (Magnetospheric Multiscale) and Cluster at about X=17 RE, separated mainly in the dawn-dusk direction at a distance of about 4 RE, encountered at duskside and dawnside part of a dipolarization front, respectively.  We analyzed the mesoscale current sheet disturbances based on multi-point data analysis between Cluster and MMS. It is shown that the current sheet thickens associated with the passage of the dipolarization front confirming results from previous statistical studies. The thickness of the current sheet, however, decreased subsequently, before recovering toward the original configuration. MMS observed enhanced field aligned currents exclusively during this thinning of the current sheet at the off-equatorial region. Multiple layers of small-scale, intense field-aligned currents accompanied by enhanced Hall-currents were detected at this region.  Based on these mesoscale and microscale multipoint observations, we infer the current structures around the localized flow and discuss the role of these mesoscale flow processes in the larger-scale magnetotail dynamics.</p><p> </p><p> </p>

scholarly journals Wetting front dynamics in an isotropic porous medium

2012 ◽  
Vol 694 ◽  
pp. 399-407 ◽  
Author(s):  
Yulii D. Shikhmurzaev ◽  
James E. Sprittles
Keyword(s):  
Porous Medium ◽  
Incompressible Liquid ◽  
Porous Matrix ◽  
Viscous Incompressible Liquid ◽  
Pore Scale ◽  
Wetting Front ◽  
Model Case ◽  
New Approach ◽  
Threshold Phenomena ◽  
Front Dynamics

AbstractA new approach to the modelling of wetting fronts in porous media on the Darcy scale is developed, based on considering the types (modes) of motion the menisci go through on the pore scale. This approach is illustrated using a simple model case of imbibition of a viscous incompressible liquid into an isotropic porous matrix with two modes of motion for the menisci, the wetting mode and the threshold mode. The latter makes it necessary to introduce an essentially new technique of conjugate problems that allows one to link threshold phenomena on the pore scale with the motion on the Darcy scale. The developed approach (a) makes room for incorporating the actual physics of wetting on the pore scale, (b) brings in the physics associated with pore-scale thresholds, which determine when sections of the wetting front will be brought to a halt (pinned), and, importantly, (c) provides a regular framework for constructing models of increasing complexity.

scholarly journals Nucleon momentum distribution in deuteron and other nuclei within the light-front dynamics method

2002 ◽  
Vol 65 (2) ◽  
Author(s):  
A. Antonov ◽  
M. Gaidarov ◽  
M. Ivanov ◽  
D. Kadrev ◽  
G. Krumova ◽  
...  
Keyword(s):  
Momentum Distribution ◽  
Light Front ◽  
Nucleon Momentum ◽  
Dynamics Method ◽  
Front Dynamics

Front dynamics in an oscillatory bistable Belousov-Zhabotinsky chemical reaction

2004 ◽  
Vol 70 (5) ◽  
Author(s):  
Bradley Marts ◽  
Karl Martinez ◽  
Anna L. Lin
Keyword(s):  
Chemical Reaction ◽  
Front Dynamics

scholarly journals Periodic black auroral patches at the dawnside dipolarization front during a substorm

2011 ◽  
Vol 116 (A5) ◽  
Author(s):  
K. Sakaguchi ◽  
K. Shiokawa ◽  
E. Donovan ◽  
A. Nakajima ◽  
Y. Hiraki ◽  
...  
Keyword(s):  
Dipolarization Front

Generation of turbulence in Kelvin-Helmholtz vortices at the Earth's magnetopause: Magnetospheric Multiscale observations

2019 ◽  
Author(s):  
Hiroshi Hasegawa ◽  
Takuma Nakamura ◽  
Daniel J Gershman ◽  
Yasuhiro Nariyuki ◽  
Viñas Adolfo ◽  
...  
Keyword(s):  
Magnetospheric Multiscale

Investigation of energy conversion processes and wave activity related to dipolarization fronts observed by MMS

2021 ◽  
Author(s):  
Soboh Alqeeq ◽  
Olivier Le Contel ◽  
Patrick Canu ◽  
Alessandro Retino ◽  
Thomas Chust ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Energy Flow ◽  
Poynting Vector ◽  
Wave Activity ◽  
Electromagnetic Energy ◽  
Particle Measurements ◽  
Dipolarization Front ◽  
The Earth ◽  
Current Densities ◽  
Scale Properties

<p>In the present work, we consider four dipolarization front (DF) events detected by MMS spacecraft in the Earth’s magnetotail during a substorm on 23rd of July 2017 between 16:05 and 17:19 UT. From their ion scale properties, we show that these four DF events embedded in fast Earthward plasma flows have classical signatures with increases of Bz, velocity and temperature and a decrease of density across the DF. We compute and compare current densities obtained from magnetic and particle measurements and analyse the Ohm’s law. Then we describe the wave activity related to these DFs. We investigate energy conversion processes via J.E calculations and estimate the importance of the electromagnetic energy flow by computing the divergence of the Poynting vector. Finally we discuss the electromagnetic energy conservation in the context of these DFs.</p>

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