J-GLOBAL ID:200904041774292940  Research Project code:0350012025 Update date:Jan. 19, 2004

On the characteristics of temperature of electrons and ions in the plasma sheet in the vicinity of the Earth

Study period:2001 - 2001
Organization (1):
Investigating Researcher (2):
Research overview:
The issue of by what kind of physical process the temperature of the plasma sheet in the tail part of the magnetosphere is determined remains yet to be solved. There are 3 likely candidates for the mass resource of the plasma sheet: (1) transportation by convection of solar wind plasma flowed into the far distant tail part to the Earth direction, (2) transportation by diffusion process of solar wind plasma from near-tail boundary region (LLBL), and (3) supply from ionospheric layers. In order to study the influence of flow-in of the solar wind in LLBL on the temperature of the plasma sheet, we are paying attention on the electron temperature observed with "GEOTAIL", and are investigating ratio of the electron and ion temperature, and variation in the vicinity of LLBL of anisotropy in the velocity space. In the vicinity of LLBL, we have found that electrons are not strongly heated up compared with the hot plasma sheet close to midnight, and only the temperature of ions rapidly changes. This is understood as the result of mixing of plasma introduced from magneto-sheeth with plasma heated in the center of the tail part. The electronic component introduced from the sheeth is found heated mainly in the parallel direction to the magnetic field line, and asymmetric in the morning and evening.
Research program: Ordinary Research
Ministry with control over the research :
Ministry of Education, Culture, Sports, Science and Technology

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