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Comparative study of a substorm event by satellite observation and model simulation
Ridley, A. J.; Wang, Hui; Ma, ShuYing
A substorm event has been simulated for the first time by using SWMF (Space Weather Modeling Framework) developed by the University of Michigan. The model results have been validated using Geotail and Cluster satellite observations. The substorm onset occurs at 22:08 UT on September 28 2004, as identified from FUV WIC observations on the NASA IMAG…
Cluster observations of high-altitude cusp during multiple fast-turning IMF
Pitout, F.; Davies, J. A.; Dunlop, M. W. +3 more
Using coordinated observations from the Cluster, DMSP and ESR radar, high-altitude cusp was investigated for a time period characterized by four fast reversals of the IMF BZ. On February 12, 2003, Cluster was flying sunward at duskside over the Northern Hemisphere, across the high-altitude northern cusp twice. Both the two crossings are during ste…
Statistical survey on the magnetic field in magnetotail current sheets: Cluster observations
Balogh, A.; Lucek, E.; Zhao, Jin Rong +2 more
The distribution properties of the magnetic field in magnetotail current sheets have been explored statistically with the magnetic measurement data of the Cluster mission from June to November of the years 2001-2005. It is found that, on average, the strength of the magnetic field and its Bz component in the current sheet are weaker in the region …
Responses of properties in the plasma sheet and at the geosynchronous orbit to interplanetary shock
Yuo, Li; Lui, ZhenXing; Zuo, PingBing +2 more
On July 22, 2004, the WIND spacecraft detected a typical interplanetary shock. There was sustaining weak southward magnetic field in the preshock region and the southward field was suddenly enhanced across the shock front (i.e., southward turning). When the shock impinged on the magnetosphere, the magnetospheric plasma convection was abruptly enha…
Convective high-speed flow and field-aligned high-speed flows explored by TC-1
Dunlop, M. W.; Baumjohann, W.; Carr, C. +6 more
From June 1, 2004 to October 31, 2006, a total 465 high-speed flow events are observed by the TC-1 satellite in the near-Earth region (-13 RE < x < -9 RE, |Y|<10 RE, |Z|<5 RE). Based on the angle between the flow and the magnetic field, the high-speed flow events are further divided into two types, that is, field-aligned high-speed flo…
Structures of magnetic null points in reconnection diffusion region: Cluster observations
Baumjohann, W.; Carr, C. M.; Zhang, Hui +10 more
Magnetic reconnection is a very important and fundamental plasma process in transferring energy from magnetic field into plasma. Previous theory, numerical simulations and observations mostly concentrate on 2-dimensional (2D) model; however, magnetic reconnection is a 3-dimensional (3D) nonlinear process in nature. The properties of reconnection i…
Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU instrument aboard TC-2
Barabash, S.; Zhang, T. L.; Carr, C. M. +6 more
The NUADU (NeUtral Atom Detector Unit) instrument aboard TC-2 recorded 4л solid angle images of charged particles (E >180 keV) spiraling around the magnetic field lines in the near-Earth plasma sheet (at -7 RE, equatorial dawn-to-night side) during a geomagnetic storm (Dst =-219 nT) on August 24, 2005. Energetic ion beam events characterized b…
The correlations of ions density with geomagnetic activity and solar dynamic pressure in cusp region
Dandouras, I.; Lucek, E.; Reme, H. +5 more
A statistical study of the properties of ions (O+, He+ and H+) measured by the Cluster-II in cusp region as a function of the solar wind dynamic pressure and geomagnetic index Kp respectively was made during the summer and fall of 2001-2003. The main results are that: (1) O+ ion density responds in a significant way to geomagnetic index Kp, and He…
Double Star TC-1 observation of the earthward flowing plasmoids in the near magnetotail
Reme, H.; Shen, Chao; Carr, C. M. +4 more
We analyze Double Star TC-1 magnetic field data from July to September in 2004 and find that plasmoids exist in the very near-Earth magnetotail. It is the first time that TC-1 observes the plasmoids in the magnetotail at X > -13 RE. According to the difference of the magnetic field structure in plasmoids, we choose two typical cases for our stu…
Continuous tailward flow in the near-Earth magnetotail observed by TC-1 satellite
Shen, Chao; Zhang, LingQian; Liu, ZhenXing +2 more
On July 11, 2004, a substorm process in the period of continuous tailward flow was observed by the joint exploration of the TC-1, IMAGE and ACE satellites. The substorm observed by the TC-1 in the near-Earth has three stages: the growth phase (from 11:43 to 12:19), the pre-expansion process (from 12:19 to 12:28) and the dipolarization process. The…