2006年4月5日中等强度磁暴期间观测到的大经度范围等离子体泡

Ionospheric Plasma Bubbles Observed in Large Longitude Range During a Medium Magnetic Storm on 5 April 2006

利用分布在70°E-210°E和20°S-40°N之间的GPS台站的数据,分析了2006年4月5日夜间(中等强度磁暴期间)观测到的电离层等离子体泡的特性.结果表明,本次事件中,等离子体泡大约发生在当地日落后1-1.5 h;空间范围为经度90°E-160°E,纬度12°S-33°N.这是第一次利用地基设备观测到如此大经度范围内的等离子体泡.等离子体泡在南半球出现较早,并且存活时间较长.在其产生的过程中,在约1100 km高度上,映射到磁赤道向上的运动速度约为300m/s,并且等离子体泡在高度上有倾斜.东向电场的存在,对激发等离子体泡起到了一定的作用.

During a medium magnetic storm on 5 April 2006, ionospheric plasma bubbles have been studied in a large area using data from the Global Positioning System （GPS） observation sites between 70°E and 210°E in longitude, 20°S and 40°N in latitude. The plasma bubbles were found between 160°E°90°E, and 12°S°33°N, appeared at about 1-1.5 hour after local sunset. The plasma bubbles occurred earlier and survived longer in the southern hemisphere than those in the northern hemisphere. And in the development process of the plasma bubbles, at about 1100 km the upward drift speed was about 300 m/s mapped onto the magnetic equator. The plasma bubbles tilted during the development. The existence of the eastward electric field was supposed to be the cause triggering the plasma bubbles.