Solar quiet daily variation (Sq) are dependent on local time. Herein, we applied the moving superposition method to separate the Sq component of correction observatory data and performed a time difference correction on the Sq component according to the longitudinal difference between the correction observatory and the field station while maintaining the time of other data components. The data were then reconstructed and used for diurnal-variation correction to improve the accuracy of the daily variations correction resu; lts The moving superposition method employs data of “nonmagnetic disturbance days” obtained 15 d before and after to perform the superposing average calculation on a daily basis, aiming to obtain the Sq of continuous morphological changes. The effect of longitude correction was tested using the observatory record and field survey data. The average correction distance of the test observatories was 2114 km, and the correction accuracies of the H (horizontal component of geomagnetic field), D (geomagnetic declination), and Z (vertical component of geomagnetic field) were improved by 28.4%, 45.0%, and 21.7%, respectively; the average correction distance of the field stations was 2130 km, and the correction accuracies of the F (geomagnetic total intensity), D, I (geomagnetic inclination) components were improved by 35.2%, 26.7%, and 13.9%, respectively. The test results also demonstrated that the longitude correction effect was greater with an increased correction distance.

太阳安静日变化 (Sq) 取决于当地时间。本文采用移动叠加法分离出改正观测站数据的Sq分量，并根据改正观测站与现场站的经度差对Sq分量进行时差改正，同时保持其他数据分量的时间。然后对数据进行重建并用于日变校正，以提高日变校正结果的准确性；移动叠加法是利用前后15 d获得的“无磁扰动日”数据，逐日进行叠加平均计算，得到连续形态变化的Sq。利用观测站记录和实地调查数据检验了经度校正的效果。试验台站平均改正距离2114公里，H（地磁场水平分量）、D（地磁偏角）、Z（地磁场垂直分量）改正精度分别提高28.4%、45.0% 、 和 21.7%；现场站平均改正距离2130公里，F（地磁总强度）、D、I（地磁倾角）分量改正精度分别提高35.2%、26.7%和13.9%。测试结果还表明，随着校正距离的增加，经度校正效果越大。H（地磁场水平分量）、D（地磁偏角）、Z（地磁场垂直分量）校正精度分别提高28.4%、45.0%、21.7%；现场站平均改正距离2130公里，F（地磁总强度）、D、I（地磁倾角）分量改正精度分别提高35.2%、26.7%和13.9%。测试结果还表明，随着校正距离的增加，经度校正效果越大。H（地磁场水平分量）、D（地磁偏角）、Z（地磁场垂直分量）校正精度分别提高28.4%、45.0%、21.7%；现场站平均改正距离2130公里，F（地磁总强度）、D、I（地磁倾角）分量改正精度分别提高35.2%、26.7%和13.9%。测试结果还表明，随着校正距离的增加，经度校正效果越大。F（地磁总强度）、D、I（地磁倾角）分量的校正精度分别提高了35.2%、26.7%和13.9%。测试结果还表明，随着校正距离的增加，经度校正效果越大。F（地磁总强度）、D、I（地磁倾角）分量的校正精度分别提高了35.2%、26.7%和13.9%。测试结果还表明，随着校正距离的增加，经度校正效果越大。