CAJ | 학술논문

卫星充电和尾迹效应会对周围的等离子体造成扰动,进而影响星上电磁和等离子测量载荷的测量精度.利用卫星与等离子体相互作用模拟软件SPIS,并采用DEMETER卫星的一组在轨测试的等离子参数,采用粒子分室法模拟了低轨道卫星的尾迹效应特性.结果显示,卫星的表面充电电位为-0.72 V,负的充电电位一定程度上减小了尾迹效应的影响,尾迹效应对等离子体的扰动在尾迹一侧约为2.5 m,离子撞击侧约为0.7 m,其余两个侧面约为1.1 m,即等离子鞘层呈桃形分布,且在尾迹区存在离子浓度为零的空白区和浓度较小的稀薄区,而在尾迹区也是电子浓度的稀薄区,但不存在电子浓度为零的空白区.
위성충전화미적효응회대주위적등리자체조성우동,진이영향성상전자화등리자측량재하적측량정도.이용위성여등리자체상호작용모의연건SPIS,병채용DEMETER위성적일조재궤측시적등리자삼수,채용입자분실법모의료저궤도위성적미적효응특성.결과현시,위성적표면충전전위위-0.72 V,부적충전전위일정정도상감소료미적효응적영향,미적효응대등리자체적우동재미적일측약위2.5 m,리자당격측약위0.7 m,기여량개측면약위1.1 m,즉등리자초층정도형분포,차재미적구존재리자농도위령적공백구화농도교소적희박구,이재미적구야시전자농도적희박구,단불존재전자농도위령적공백구.
The wake effect can disturb the plasma around the spacecraft;and it can influence the detection precision of electromagnetism and plasma payloads. In order to investigate the wake characteristic, we use the SPIS (Spacecraft Plasma Interaction System) software and the Particle in Cell method to investigate the wake effect. The satellite mode and plasma parameters were got from the DEMETER satellite. The simulation results show that the satellite charging potential is -0.72 V and the plasma around the satellite is significantly disturbed by the wake effect. The sheath is like a peach in shape, in the wake side about 2.5 m, ram side about 0.7m and the other two sides about 1.1 m. And in the wake region, the electrons that initially enter the wake build up a space charge that repels all other electrons, so the wake can be considered essentially also devoid of electrons.