## 7 Discussion and Limitations  
Possibly, the elimination of the diel cycle removes not only _Sq_ variations (over a 24 h period) from the magnetic data, but also some part of the 12 h interval, which is close to the period of the lunar tidal wave. Therefore, emphasizing the lunar effect in magnetic variations is very difficult.  
The five magnetic stations are located across the Earth, starting from Alberta, Northern Canada, to Baisiogala, Lithuania, Eastern Europe, close to subauroral latitudes. In this case, latitudinal and longitudinal magnetic variations due to lunar tidal waves can also be discussed.  
There are several studies exploring the varying influences of high-latitude electric fields and atmospheric waves on daily fluctuations of ionospheric currents [49], studying the seasonal longitudinal climatology of semi-diurnal lunar tidal variation in the equatorial electrojet [50], describing the semi-diurnal lunar tidal influence on neutral winds, plasma velocities, and atomic oxygen airglow [51], and exploring semi-diurnal tidal variations and their effects on the ionosphere-thermosphere-mesosphere system [52].  
This work focuses exclusively on the coordinates of the meridian and delves into the essence of tidal waves. Although other aspects, such as different coordinates and types of waves, could be explored, they remain beyond the scope of this study. These areas could serve as subjects for future research efforts, extending the understanding of tidal phenomena and local magnetic field in diverse contexts.  
It is well established that the Moon influences the global and local magnetic field of the Earth, a fact confirmed and demonstrated through detailed studies performed not with data from five magnetometers scattered around the world but with data from dozens of magnetometers belonging to regular (and officially recognized by the scientific community) geomagnetic observatories covering our planet in latitude and longitude. Although the results discussed herein are based on the analysis of limited data over time and from few observation sites, the statistical treatment of the presented data is undoubtedly correct and appropriate. Geomagnetic conditions were not considered or characterized in this study, but could be a topic for further research.  
An area for potential improvement in the study lies in the comparison of data between local magnetic field measurement sites and nearby tidal wave measurement stations, rather than prioritizing comparison based on geomagnetic proximity. It should be noted that the global dipolar magnetic field establishes geomagnetic coordinates, a crucial reference system for understanding conjugate effects between distinct points on Earth's surface.  
The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app14083332/s1](https://www.mdpi.com/article/10.3390/app14083332/s1)]([https://www.mdpi.com/article/10.3390/app14083332/s1](https://www.mdpi.com/article/10.3390/app14083332/s1)), Figure S1: The map with the magnetometers and tidal wave stations; Figure S2: MSC logistic map synchronization; Figure S3: SRCI computational results.  
U.O. carried out the experiment and performed the computations. [PERSON] and [PERSON] verified the statistical analysis. [PERSON] performed data preparation. [PERSON] conceived of the presented idea, developed the theoretical formalism and supervised the project, and took the lead in writing the manuscript. [PERSON] supervised the findings of this work. [PERSON], [PERSON] and [PERSON] were involved in planning the work. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
**Data Availability Statement**: All data generated or analyzed during this study are included in this published article.  
**Conflicts of Interest**: The authors declare no conflicts of interest.