Interplanetary dust distribution and temporal variability of Mercury's atmospheric Na
Interplanetary dust distribution and temporal variability of Mercury's atmospheric Na
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DOI：
10.1029/2009gl039036
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发表时间：
2009-08-04
影响因子：
5.2
通讯作者：
Okano, Shoichi
中科院分区：
文献类型：
--
作者：
Kameda, Shingo;Yoshikawa, Ichiro;Okano, Shoichi
内太阳系的行星际尘埃（IPD）分布还没有很好的了解，因为缺乏直接的尘埃测量，所以人们需要依靠难以解释的黄道光观测。水星大气不稳定，大气中Na的来源过程尚不清楚。过去的观测结果表明，大气Na浓度与太阳通量、太阳黑子数、日心距、太阳辐射压等没有或很低的相关性。我们表明，汞的大气钠密度的变化强烈依赖于IPD分布。也就是说，当水星远离（接近）IPD的对称平面时，Na浓度低（高），因此可以从水星大气中Na浓度的时间变化推断出水星轨道附近的IPD分布。引文：Kameda，S.，I. Yoshikawa，M. Kagitani和S. Okano（2009），Interplanetary dust distribution and temporal variability of Mercury's atmospheric Na，Geophys.保留信函：36，L15201，doi：10.1029/2009GL039036。
The interplanetary dust (IPD) distribution in the inner solar system is not yet well understood because of lack of direct dust measurements in the inner solar system and so one needs to rely on zodiacal light observations that are difficult to interpret. Mercury has an unstable atmosphere, and the source processes of Na in its atmosphere are unclear. Results of past observations have revealed that the atmospheric Na density has no or low correlation with the solar flux, sunspot number, heliocentric distance, or solar radiation pressure. We show that the variability of Mercury's atmospheric Na density depends strongly on the IPD distribution. That is, Na density is low (high) when Mercury is far away from (close to) the symmetry plane of IPD, and so one can infer the IPD distribution near Mercury orbit from the temporal variability of Na density in Mercury's atmosphere. Citation: Kameda, S., I. Yoshikawa, M. Kagitani, and S. Okano (2009), Interplanetary dust distribution and temporal variability of Mercury's atmospheric Na, Geophys. Res. Lett., 36, L15201, doi:10.1029/2009GL039036.