Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods
The datasets of daily variations is obtained from the geomagnetic field raw observations at the Coimbra Magnetic Observatory (COI, Portugal). The data set was obtained for the 01.01.2007-31.12.2017 time interval and covers almost the entire solar cycle 24.The raw data were processed using two method...
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Elsevier
2021-08-01
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| Series: | Data in Brief |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352340921004583 |
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| author | Anna Morozova Rania Rebbah Paulo Ribeiro |
| author_facet | Anna Morozova Rania Rebbah Paulo Ribeiro |
| author_sort | Anna Morozova |
| collection | DOAJ |
| description | The datasets of daily variations is obtained from the geomagnetic field raw observations at the Coimbra Magnetic Observatory (COI, Portugal). The data set was obtained for the 01.01.2007-31.12.2017 time interval and covers almost the entire solar cycle 24.The raw data were processed using two methods to extract daily variability. The first method uses the so-called “geomagnetically quiet days” to calculate S-type variations as daily means resulting in the data sub-set named “IQD Sq and SD”. The second method uses the principal component analysis (PCA) to extract main variability modes of the original data. The first three modes produced by PCA and explaining up to 98% of the variability of the raw data are in the data sub-set named “PCA modes”. Both methods allow to extract regular geomagnetic field variations related to daily variations (S-type variations) in the ionospheric dynamo region and some magnetospheric currents (e.g., field-aligned currents).The COI location in middle latitudes near the mean latitude of the ionospheric Sq current vortex's focus allows studying its seasonal and decadal variability using the S-type regular variations of the geomagnetic field measured near the ground. The S-type variations for the X and Y components of the geomagnetic field obtained at the COI observatory can also be re-scaled and used to analyze geomagnetic field variations obtained at other European geomagnetic observatories at close latitudes. The S-type variations for the Z component of the geomagnetic field obtained at the COI observatory can be compared to similar variations observed at more continental regions to study the so-called “coastal effect” in the geomagnetic field variations. |
| first_indexed | 2024-12-17T12:50:17Z |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-12-17T12:50:17Z |
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| spelling | doaj.art-801b0a4eaa504b088eac6baabaf5b1ef2022-12-21T21:47:37ZengElsevierData in Brief2352-34092021-08-0137107174Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methodsAnna Morozova0Rania Rebbah1Paulo Ribeiro2CITEUC, Department of Physics, University of Coimbra, Coimbra, Portugal; Instituto de Astrofísica e Ciências do Espaço, Department of Physics Coimbra, University of Coimbra, Portugal; Corresponding author at: Instituto de Astrofísica e Ciências do Espaço, Department of Physics Coimbra, University of Coimbra, Portugal.CITEUC, Department of Physics, University of Coimbra, Coimbra, PortugalCITEUC, OGAUC, University of Coimbra, Coimbra, PortugalThe datasets of daily variations is obtained from the geomagnetic field raw observations at the Coimbra Magnetic Observatory (COI, Portugal). The data set was obtained for the 01.01.2007-31.12.2017 time interval and covers almost the entire solar cycle 24.The raw data were processed using two methods to extract daily variability. The first method uses the so-called “geomagnetically quiet days” to calculate S-type variations as daily means resulting in the data sub-set named “IQD Sq and SD”. The second method uses the principal component analysis (PCA) to extract main variability modes of the original data. The first three modes produced by PCA and explaining up to 98% of the variability of the raw data are in the data sub-set named “PCA modes”. Both methods allow to extract regular geomagnetic field variations related to daily variations (S-type variations) in the ionospheric dynamo region and some magnetospheric currents (e.g., field-aligned currents).The COI location in middle latitudes near the mean latitude of the ionospheric Sq current vortex's focus allows studying its seasonal and decadal variability using the S-type regular variations of the geomagnetic field measured near the ground. The S-type variations for the X and Y components of the geomagnetic field obtained at the COI observatory can also be re-scaled and used to analyze geomagnetic field variations obtained at other European geomagnetic observatories at close latitudes. The S-type variations for the Z component of the geomagnetic field obtained at the COI observatory can be compared to similar variations observed at more continental regions to study the so-called “coastal effect” in the geomagnetic field variations.http://www.sciencedirect.com/science/article/pii/S2352340921004583Geomagnetic fieldCoimbra Magnetic Observatory (COI)Regular geomagnetic field variationsSolar quiet variation (Sq)Disturbed solar variation (SD)Principal component analysis |
| spellingShingle | Anna Morozova Rania Rebbah Paulo Ribeiro Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods Data in Brief Geomagnetic field Coimbra Magnetic Observatory (COI) Regular geomagnetic field variations Solar quiet variation (Sq) Disturbed solar variation (SD) Principal component analysis |
| title | Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods |
| title_full | Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods |
| title_fullStr | Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods |
| title_full_unstemmed | Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods |
| title_short | Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods |
| title_sort | datasets of the solar quiet sq and solar disturbed sd variations of the geomagnetic field from the mid latitudinal magnetic observatory of coimbra portugal obtained by different methods |
| topic | Geomagnetic field Coimbra Magnetic Observatory (COI) Regular geomagnetic field variations Solar quiet variation (Sq) Disturbed solar variation (SD) Principal component analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2352340921004583 |
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