2.3.1 spase://NASA/DisplayData/UCLA/Global-MHD-code/mS1-Vx/PT10S Characteristics of Reconnection Sites and Fast Flow Channels in an MHD Simulation. Supplementary MHD simulation movie mS1-Vx.mp4 for 14 March 2008. https://doi.org/10.21978/p8rw5g 2020-08-01T00:00:00Z This movie of the GSM X component of plasma flow velocity is on the original, not interpolated grid. Flow directions are displayed on a reduced grid 1/7 the size of the original. Vectors saturate at an equatorial speed of 300 km/s to avoid clutter. Red and yellow colors show earthward flows while blue colors identify tailward flow. Contours of Vx = 250 km/s are denoted by heavy black lines. Inside these contours abs(Vx) reaches values of 500 km/s or more. White lines are contours of plasma pressure. Heavy black and white lines at >10 Re pre-midnight depict the location of THEMIS spacecraft. A dashed black semi-circle defines synchronous orbit. The Earth is a green half-circular patch. The first image in this movie at 04:00 UT is the start of the growth phase of a substorm with onset at 04:44 UT. This image demonstrated the validity of one of the key points of this paper. Reconnection and fast flows are continuously present throughout the entire substorm. At this time, keograms from ground station in the pre-midnight sector show no auroral activity poleward of the growth phase arcs except for RANK where aurora was present in the northeastern sky, which did not contribute to its keogram. This location projects close to the moon. The location of reconnection sites is evident from bifurcation in the high-speed flow with red earthward and blue tailward. At this moment, there are six earthward fast flow channels. Our arbitrary constraint on channel area eliminated the two small channels from further consideration. Activation of the movie reveals that the two fast flow channels in this image turn towards the flanks just outside the apogee of the THEMIS spacecraft. By the substorm onset at 04:44 UT, various x-lines coalesce into a single 55 Re long x-line with a high-speed flow channel engulfing the THEMIS spacecraft. By 04:55 UT, this channels breaks up into three separate channels Mostafa El-Alaoui, RaymondJ. Walker; Robert L. McPherron R.L. McPherron; M. El-Alaoui; R.J. Walker; and R.L. Richard 2020-08-31T00:00:00Z UCLA NASA Substorm current wedge development and evolution using THEMIS observation and simulations NNX17AB83G NASA Structure and evolution of plasma sheet fast flows using THEMIS observation and global MHD simulations NNX15AI63G NSF GEM: A Statistical Study of the Substorm Sequence and Phenomena Associated with Expansion Onset 1602588 spase://SMWG/Person/Robert.L.McPherron GeneralContact spase://SMWG/Person/James.M.Weygand MetadataContact Virtual Magnetospheric Observatory directory containing movies for Journal of Gephysical Research publication. http://vmo.igpp.ucla.edu/data1/McPherron/Simulation_Movies_and_Data/Simulation_Movies/mS1-Vx.avi Supplimentary movies for JGR publication spase://SMWG/Repository/UCLA/VMO Online Open Virtual Magnetospheric Observatory http://vmo.igpp.ucla.edu/data1/ EN AVI If data downloaded from the VMO Data Repository are used in publication kindly acknowledge the Virtual Magnetospheric Observatory, Earth, Planetary and Space Science Department, University of California, Los Angeles for providing access to the data. Raw UCLA M. El-Alaoui MHD Simulation MHD Simulation Movies Raw spase://SMWG/Instrument/UCLA/Global-MHD-code ThermalPlasma 2008-03-14T04:00:00 2008-03-14T05:00:00 PT10S Earth.Magnetosphere MHD Simulation Substorm High Speed Earthward Flows MHD simulation movie of GSM X component of position for 14 March 2008 X component of position Two dimensional display of this movie of the GSM X component of position is on the original. PT10S Re Cartesian GSM 3840 1890 Each image is 3840 pixels by 1890 pixels and there are 360 frames in the movie. -70 0 Direction Positional MHD simulation movie of GSM Y component of position for 14 March 2008 Y component of position Two dimensional display of this movie of the GSM Y component of position is on the original. PT10S Re Cartesian GSM 3840 1890 Each image is 3840 pixels by 1890 pixels and there are 360 frames in the movie. -20 20 Direction Positional MHD simulation movie of GSM X component of plasma flow velocity for 14 March 2008 Vx component of plasma flow Two dimensional display of this movie of the GSM X component of plasma flow velocity is on the original, not interpolated grid. PT10S km/s Cartesian GSM 3840 1890 Each image is 3840 pixels by 1890 pixels and there are 360 frames in the movie. -500 500 Vector Velocity MHD simulation movie of GSM plasma flow velocity for 14 March 2008 Vx and Vy components of plasma flow Two dimensional display of this movie of the GSM plasma flow velocity interpolated grid. PT10S km/s Cartesian GSM 3840 1890 Each image is 3840 pixels by 1890 pixels and there are 360 frames in the movie. -300 300 Vector Velocity