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首页> 外文期刊>Geophysical Research Letters >Detection of Negative Pickup Ions at Saturn's Moon Dione
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Detection of Negative Pickup Ions at Saturn's Moon Dione

机译:检测土星月亮迪酮的阴性拾音离子

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We investigate a possible negative ion feature observed by the Cassini Plasma Spectrometer (CAPS) during a flyby of Saturn's moon Dione that occurred on 7 April 2010. By examining possible particle trajectories, we find that the observed particles are consistent with negative pickup ions originating near the moon's surface. We find that the mass of the negative pickup ions is in the range of 15-25 u and tentatively identify this species as O-, likely resulting from ionization and subsequent pickup from Dione's O-2-CO2 exosphere. Our estimates show that the negative ion density is similar to 3 x 10(-3) cm(-3). This is comparable to, but slightly smaller than, that previously reported for the density of O-2(+) pickup ions for the same flyby, indicating that negative pickup ions may represent a major loss channel for Dione's exosphere.
机译:我们研究了Cassini等离子谱仪(Caps)在2010年4月7日发生的Saturn的月亮迪翁飞行中观察到的可能负离子特征。通过检查可能的粒子轨迹,我们发现观察到的粒子与源自附近的负拾取离子一致 月亮的表面。 我们发现负拾取离子的质量在15-25 U的范围内,并且暂时识别该物种作为O-,可能是由狄埃德的O-2-CO 2外部的电离和随后的拾取产生的。 我们的估计表明,负离子密度类似于3×10(-3)cm(-3)。 这与先前报道的同一飞蝇的O-2(+)拾取离子的密度略小的相当,表明负拾取离子可以代表Dione的极端层的主要损失通道。

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