## 5 Conclusions
The following supporting information can be downloaded at [[https://www.mdpi.com/article/10.3390/rs14195001/s1](https://www.mdpi.com/article/10.3390/rs14195001/s1)]([https://www.mdpi.com/article/10.3390/rs14195001/s1](https://www.mdpi.com/article/10.3390/rs14195001/s1)), Supplementary Materials File S1 with additional figures (Figure S1: Geomagnetic ground observatory X--North component; Figure S2: Correlation coefficients of Geomagnetic ground observatories; Figure S3: Cumulative graphs for geomagnetic ground observatories; Figure S4: DMS and aerosol maps on the day of the eruption; Figure S5: SO2 long time series after removing seasonal trend; Figure S6: DMS long time series after removing seasonal trend). Figure S7: Aerosol long time series after removing seasonal trend). Supplementary Materials File S2 with the Swarm magnetic residuals for all the identified anomalies reported in Figure 25 is also provided. Animated GIF of the SO2 propagation from Piantubo 1991 volcano explosion all over the equatorial places composed by daily worldwide pictures of SO2 at 23 UT in June and July 1991. Conceptualisation, methodology, software, formal analysis, visualisation, writing--original draft preparation, D.M. ; investigation D.M. and H.Z. ; data curation, D.M., R.Y., Z.Z. and X.S. ; resources, K.Z. ; writing--review and editing, D.M., K.Z., H.Z., W.C., Y.C., X.H., T.W., J.W., D.Z. and Y.Z. ; supervision, K.Z. ; project administration, K.Z. ; funding acquisition, K.Z. and D.M. All authors have read and agreed to the published version of the manuscript. This research was funded by the National Natural Science Foundation of China, grant number 41974084; the China Postdoctoral Science Foundation, grant number 2021M691190; the International Cooperation Project of the Department of Science and Technology of Jilin Province, grant number 20200801036 GH; and the Italian Ministry of University and Research, grant number D53J19000170001 (Pianeta Dinamico--Working Earth). The APC has been funded by China Postdoctoral Science Foundation, grant number 2021M691190. Not applicable. Data Availability Statement: Seismic data are freely available from \"Instituto Geografico Nacional\" of Spain on their web portal ([[https://www.ign.es/web/ign/portal/sis-area-sismicidad](https://www.ign.es/web/ign/portal/sis-area-sismicidad)]([https://www.ign.es/web/ign/portal/sis-area-sismicidad](https://www.ign.es/web/ign/portal/sis-area-sismicidad)) last access 19 July 2022). MERRA-2 data can be downloaded from [[https://disc.gsfc.nasa.gov/datasets?project=MERRA-2](https://disc.gsfc.nasa.gov/datasets?project=MERRA-2)]([https://disc.gsfc.nasa.gov/datasets?project=MERRA-2](https://disc.gsfc.nasa.gov/datasets?project=MERRA-2)) (last access on 23 July 2022) with Earth Observation NASA free credential. _Suzurm_ data are freely available via ftp and http at swarm-diss.ee.osa.int server (Inst access on 27 July 2022). China Seismo Electromagnetic Satellite data are freely available at www.leos.ac.cn (last access on 15 December 2020) upon registration and approval. Some results presented in this paper rely on the data collected at \"Guimar\" (GUI) and \"Tamanrasset\" (TAM). We thank \"Instituto Geografico Nacional (IGNS)\", \"Institut de Physique du Globe de Paris (IFGP)\" and \"Centre de Recherche en Astronomie, Astrophysique et Geophysique (CRAAG)\", for supporting its operation and INTERMAGNET for promoting high standards of magnetic observatory practice (www.intermagnet.org, last access on 12 September 2022). We would acknowledge [PERSON] for his suggestions and help and [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON] for their contributions in the preparation, writing and optimisation of some codes re-used in this work originally developed for some of the cited papers. **Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.