Proj
J-GLOBAL ID:200904062054143847  Research Project code:0450021603 Update date:Jan. 19, 2004

Study on electric field generation mechanism in the neighbor of aurora acceleration domain

オーロラ加速領域近傍での電場生成機構に関する研究
Study period:2002 - 2002
Organization (1):
Investigating Researcher (1):
Research overview:
The aurora arc observed on the earth is generated by collision of electrons that fall down from the sky with atmospheric air. Electron is accelerated in the direction of earth through the upper direction magnetic line field in the aurora acceleration domain to form aurora arc. That is, it is indispensable to search for the formation mechanism of the electric field in the aurora acceleration domain to elucidate the formation process of the aurora arc. Although several theories have been proposed, many problems have not been elucidated including generation mechanism, growth time, duration time of the electric field and so on. Therefore, we are performing studies on the generation of the electric field using the data of AKEBONO satellite that is flying in the aurora accelerating domain existing in the height of 3000 to 10000km. The characteristic distribution called Bi-streaming electron conics that is not generated under stationary electric field is frequently observed in the rate distribution function supplied by low energy particle counter (LEP) installed in AKEBONO satellite. Result of the analysis and simulation showed that Bi-streaming electron conics is generated when electrons originated from magnetosphere experienced the electric field that grows with time in mid-air of the satellite. That is, when Bi-streaming electron conics are observed, it shows that acceleration electric field that grows with time may possibly present in mid-air. Further, the scale of growth time of the electric field obtained by the simulation can restrict candidate among numerous mechanism of electric field formation.

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