Kinematic Measurements of Polar Jets Observed by the Large-Angle Spectrometric Coronagraph
Kinematic Measurements of Polar Jets Observed by the Large-Angle Spectrometric Coronagraph
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DOI：
10.1086/307721
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发表时间：
1999-09
期刊：
影响因子：
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通讯作者：
B. Wood;M. Karovska;J. W. Cook;R. Howard;G. Brueckner
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文献类型：
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作者：
B. Wood;M. Karovska;J. W. Cook;R. Howard;G. Brueckner
我们分析了由太阳和日球层天文台上的大角度光谱日冕仪(LASCO)仪器观测到的极地喷流。这里研究的事件发生在1997年3月24日和8月5日。我们分析的主要目的是确定喷流的运动是否与弹道行为一致。尽管弹道轨迹在拟合观测到的运动学运动方面取得了一些成功，但有大量证据表明，仅靠重力并不能控制喷气式飞机的运动。首先，8月5日的地震在3 R☉以上似乎表现出轻微的加速，而不是减速。其次，这里研究的所有事件都有非常相似的速度，这表明当喷流到达LASCO视场时，喷流已经并入了周围的太阳风。如果是这样的话，这些喷流可能会非常有用，可以在太阳极地地区的低空追踪太阳风。
We analyze polar jets observed by the Large-Angle Spectrometric Coronagraph (LASCO) instrument aboard the Solar and Heliospheric Observatory. The events studied here are from 1997 March 24 and August 5. The main objective of our analysis is to determine whether the jets' motions are consistent with ballistic behavior. Although ballistic trajectories have some success in fitting the observed kinematic motions, there is substantial evidence that gravity alone is not regulating the movement of the jets. First of all, the August 5 events appear to exhibit slight accelerations rather than decelerations above 3 R☉. Second, all the events studied here have very similar velocities, suggesting that by the time the jets reach the LASCO field of view, the jets have been incorporated into the ambient solar wind. If this is the case, the jets could be very useful as tracers of the solar wind at low heights in the Sun's polar regions.