The interplanetary magnetic field influences mid-latitude surface atmospheric pressure
The interplanetary magnetic field influences mid-latitude surface atmospheric pressure
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DOI：
10.1088/1748-9326/8/4/045001
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发表时间：
2013-04
影响因子：
6.7
通讯作者：
M. Lam;G. Chisham;M. Freeman
中科院分区：
文献类型：
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作者：
M. Lam;G. Chisham;M. Freeman
极地地区存在着对行星际磁场（IMF）分量By波动的气象响应，这一点已得到充分证实。更有争议的是，有证据表明这种太阳-天气耦合是通过全球大气电路发生的。因此，人们认为，这种影响在高纬度地区最大，在低纬度和中纬度地区可以忽略不计，因为国际货币基金组织的扰动集中在极地地区。我们证明了一个以前未被认识到的影响，国际货币基金组织由中纬度表面压力。在高正和高负IMF By期间的平均表面压力之间的差异具有统计上显著的中纬度波结构，类似于大气Rossby波。我们的研究结果表明，一种机制，是已知的产生大气响应IMF在极地地区也能够调制预先存在的天气模式在中纬度地区。我们建议从传统气象学的机制。影响的幅度是典型的集合数值天气预报的初始分析的不确定性。因此，太阳对高层大气的相对局部的小幅度影响可能通过大气动力学的非线性演变对关键的大气过程产生重要影响。
The existence of a meteorological response in the polar regions to fluctuations in the interplanetary magnetic field (IMF) component By is well established. More controversially, there is evidence to suggest that this Sun–weather coupling occurs via the global atmospheric electric circuit. Consequently, it has been assumed that the effect is maximized at high latitudes and is negligible at low and mid-latitudes, because the perturbation by the IMF is concentrated in the polar regions. We demonstrate a previously unrecognized influence of the IMF By on mid-latitude surface pressure. The difference between the mean surface pressures during times of high positive and high negative IMF By possesses a statistically significant mid-latitude wave structure similar to atmospheric Rossby waves. Our results show that a mechanism that is known to produce atmospheric responses to the IMF in the polar regions is also able to modulate pre-existing weather patterns at mid-latitudes. We suggest the mechanism for this from conventional meteorology. The amplitude of the effect is comparable to typical initial analysis uncertainties in ensemble numerical weather prediction. Thus, a relatively localized small-amplitude solar influence on the upper atmosphere could have an important effect, via the nonlinear evolution of atmospheric dynamics, on critical atmospheric processes.