Earth's magnetotail current sheet structure of the magnetic field

Title: Earth's magnetotail current sheet structure of the magnetic field Author: Zhao Rong Jin Degree-granting units: Graduate School of Chinese Academy of Sciences (Space Science and Applied Research Center) Keywords: magnetic field geometry;; standard current sheet;; flat current sheet;; tilted current sheet;; current sheet flapping Abstract: In this paper the magnetic field using Magnetic lifter Cluster multi-point detection and related data analysis, a more systematic study of the magnetotail current sheet
In the magnetic field geometry characteristics and distribution, access to a rich and valuable research results. The main results of this paper is as follows
. 1 flat current sheet magnetic field geometry and spatial distribution of component features, the movement of charged particles and their corresponding characteristics.
The results show that the magnetic field component in the flat current sheet is generally stronger than the weight, spiral-shaped magnetic field structure (where L is the corresponding structure,
The D-structure on the bear), the current density mainly towards dusk, the field more obvious to the component. Current sheet normal along the north-south direction. Neutral sheet and a half
Thickness less than the minimum radius of curvature of magnetic field lines. The electron motion is adiabatic, and the movement of non-adiabatic ion current density of the main
Carriers are electrons. Statistical studies have shown that the current film is generally flat with the interplanetary magnetic field component is the same number, but sometimes stronger than the latter
. This shows that the flat portion from the current sheet in interplanetary, some from the current sheet of other physical processes. Flat current
The emergence of film and the local time http://www.999magnet.com/products/131-magnetic-lifter and substorm activity phase has nothing to do. Flat area in the current film at midnight, in the neutral sheet to reach the strongest, and in the current
Sheet boundary layer and lobe is relatively weak, on the current sheet center was "quasi-symmetric" distribution (the distribution of the levy). The flat area in the non-midnight
Current sheet, by the expansion of the magnetic tail effect, was "asymmetric" distribution. Farther away from the midnight zone, "asymmetric" distribution of the more significant.
2. Inclined current sheet magnetic field geometry characteristics and physical characteristics of the current sheet flapping and trigger mechanism of. The results show that, for the tilt
Structural characteristics of the current sheet magnetic field observations: (1) tilted current sheet magnetic field lines within the current sheet structure and the standard structure of the magnetic field lines is the same,
But magnetic field lines between the slip occurred. (2) in the neutral sheet, the intense magnetic field rotation. Minimum radius of curvature of the magnetic field, the neutral sheet
Half-thickness, and current sheet tilt angle of sliding Rcminh?, Similar to satisfy the three relations h? Cos? (3). In the neutral sheet, the current density
Generally achieve the strongest, showed a single peak structure, field and weight to the more obvious components. And the more current sheet tilt, the stronger the current density, field components and to
Component of the more obvious. In some cases, the neutral sheet current density on the center of a bimodal or asymmetric distribution. For the current sheet flapping special
Of: (1) kinetic energy of the formation of current sheet film magnetic fluctuations from the end of twilight to midnight on both sides spread. JB direction of its spread can be more easily by the magnetic field gradient
Determine the degree of direction. There are also local steady-state current sheet flapping, but not the formation of wave propagation. Current sheet flapping often makes
Current sheet at the local tilt within a current sheet. (2) the current sheet flapping in the process, the satellite continuously through the current sheet, current density
Field component to the component and the sign was a quasi-periodically alternating. (3) flapping wave phase speed is usually tens of km / s, wavelength of several
So. Within the magnetotail current sheet flapping synchronous communication. Flapping wave substorm activity occurred with no significant relationship between duration
Can be up to several hours. Chip shot on the current management mechanism of the animal that the magnetotail current sheet flapping magnetotail magnetic field is intrinsic vibration of large-scale
Swing, the process is likely to trigger up and down movement with the plasma flow. Accordingly, this current sheet flapping on the trigger and dissemination process
Give a qualitative description of the physical image. 3 current sheet flapping analytical characteristics of the magnetic field structure. According to the magnetic current sheet flapping
Field geometry of the observed facts, by analogy to the standard magnetic field distribution of Harris current sheet, this paper has been flapping current sheet magnetic field distribution
Approximate model, and thus systematic quantitative analysis of the magnetic field and current sheet flapping related physical characteristics of the overall distribution. The use of magnetic spin
Transfer analysis, the paper also received a magnetic field line curvature and neutral sheet half-thickness distribution and the physical relationship between the two. The model
Simulation and satellite observations consistent with the actual observations, which also shows the magnetic field model of the structure is reasonable, its theoretical analysis there is a certain
Value. 4. Magnetotail current sheet magnetic field distribution of the statistical analysis. In the 2001-2005 Cluster magnetotail current sheet during magnetic
Field of statistical analysis showed that the current sheet center of the magnetic field strength and weight at midnight in the magnetotail region is usually weak, and in the magnetosphere morning, dusk
Both sides of the generally strong, indicating that the thin current sheet region at midnight, and in the morning, faint on both sides of the current sheet thick. In the twilight on both sides, making the current sheet
Violent action, especially in the morning side of the worst, and at midnight of the current sheet flapping area is relatively the weakest. 21:00-01:00 in the range of magnetic local time, negative and flat
Greater chance of emergence of the current sheet, magnetic reconnection or current disruption and other activities more likely to occur. Magnetotail current sheet tilt component and magnetic field lines
Angle frequency distribution are approximately normally distributed, the odds of a flat current sheet is the standard current sheet about 1 / 3; and magnetic field strength and sub-
Volume was mainly distributed in 1 ~ 10nT range. Y component of the current strength of the film is approximately 1AU y component of the interplanetary magnetic field at the double, both
The correlation coefficients are particularly high for a flat current sheet, which indicates that the size of the current sheet B y and symbols vulnerable component of the interplanetary magnetic field B y loaded
Department of factors. Degree Year: 2009