The 27 day solar rotational effect on mesospheric nighttime OH and O(3) observations induced by geomagnetic activity.
The 27 day solar rotational effect on mesospheric nighttime OH and O(3) observations induced by geomagnetic activity.
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DOI：
10.1002/2015ja021183
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发表时间：
2015-09
影响因子：
2.8
通讯作者：
Wang, S.
中科院分区：
文献类型：
--
作者：
Fytterer, T.;Santee, M. L.;Sinnhuber, M.;Wang, S.
2004年至2009年（2004年至2014年），Aura卫星上的地球观测系统微波临边探测仪仪器进行了观测，以研究中间层OH（O3）中27天的太阳旋转周期以及与地磁活动的物理联系。数据分析的重点是与外辐射带（55°N/S-75°N/S）相连的地磁纬度的夜间测量。应用叠加历元分析揭示了一个独特的27天太阳旋转信号OH和O3在冬季在两个半球的高度>70公里。OH响应是正的，并且与相应的地磁活动信号同相，持续1-2天。相比之下，O3反馈是负的，延迟1天，并在4天后出现。最大的OH（O3）峰位于75 km处，超过了95%的显著性水平，测量噪声<2%（<0.5%），相对于相应的背景，其变化达到+14%（−7%）。OH在75公里处观察到响应粒子降水后，地磁活动超过一定的阈值，这取决于各自的OH背景。OH和O3在两半球75公里的关系被发现是非线性的。特别是，对于相对较弱的地磁扰动和伴随的小的绝对OH变化（<0.04 ppb），OH对O3有很强的影响。相比之下，催化O3消耗被认为是减缓较强的地磁变化和OH异常（0.04-0.13 ppb），揭示约-0.11 ppm的小变化。极光区中层夜间OH和O_3卫星观测分析地磁活动引起的夜间OH和O_3的27天太阳自转信号北方和南半球75 km处OH和O_3的非线性关系
Observations performed by the Earth Observing System Microwave Limb Sounder instrument on board the Aura satellite from 2004 to 2009 (2004 to 2014) were used to investigate the 27 day solar rotational cycle in mesospheric OH (O3) and the physical connection to geomagnetic activity. Data analysis was focused on nighttime measurements at geomagnetic latitudes connected to the outer radiation belts (55°N/S–75°N/S). The applied superposed epoch analysis reveals a distinct 27 day solar rotational signal in OH and O3 during winter in both hemispheres at altitudes >70 km. The OH response is positive and in‐phase with the respective geomagnetic activity signal, lasting for 1–2 days. In contrast, the O3 feedback is negative, delayed by 1 day, and is present up to 4 days afterward. Largest OH (O3) peaks are found at ~75 km, exceeding the 95% significance level and the measurement noise of <2% (<0.5%), while reaching variations of +14% (−7%) with respect to their corresponding background. OH at 75 km is observed to respond to particle precipitation only after a certain threshold of geomagnetic activity is exceeded, depending on the respective OH background. The relation between OH and O3 at 75 km in both hemispheres is found to be nonlinear. In particular, OH has a strong impact on O3 for relatively weak geomagnetic disturbances and accompanying small absolute OH variations (<0.04 ppb). In contrast, catalytic O3 depletion is seen to slow down for stronger geomagnetic variations and OH anomalies (0.04–0.13 ppb), revealing small variations around −0.11 ppm. Analysis of mesospheric nighttime OH and O3 satellite observations at auroral latitudes The 27 day solar rotational signal in nighttime OH and O3 induced by geomagnetic activity Nonlinear relation between OH and O3 at 75 km in the Northern and Southern Hemisphere