Recovering external contribution from the monthly mean series of a given geomagnetic observatory
The differences between monthly mean values of the observed geomagnetic field and monthly values predicted by different models of the internal geomagnetic field (named “model biases”) for the time period 2000-2015 at several geomagnetic observatories are analyzed. We notice that increasing the maxim...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
2016-07-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/6971 |
| _version_ | 1811209992530821120 |
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| author | Bejo Duka Eni Duka Klaudio Peqini |
| author_facet | Bejo Duka Eni Duka Klaudio Peqini |
| author_sort | Bejo Duka |
| collection | DOAJ |
| description | The differences between monthly mean values of the observed geomagnetic field and monthly values predicted by different models of the internal geomagnetic field (named “model biases”) for the time period 2000-2015 at several geomagnetic observatories are analyzed. We notice that increasing the maximum degree of the model is not always followed by the decrease of such “model bias”. The time series of these “model biases” reduced by their average resulted to be approximately the same for all models and should represent the external (non-modeled) contribution to the observed geomagnetic field. These time series for different observatories (close or away to each other) are compared and their power spectra are analyzed. Such spectra have common features like the annual and semi-annual variation with some possible sporadic cases of seasonal variation. |
| first_indexed | 2024-04-12T04:49:19Z |
| format | Article |
| id | doaj.art-cde0ea93f9014e009ca0c80e98e614f1 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-04-12T04:49:19Z |
| publishDate | 2016-07-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-cde0ea93f9014e009ca0c80e98e614f12022-12-22T03:47:22ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2016-07-0159310.4401/ag-69716092Recovering external contribution from the monthly mean series of a given geomagnetic observatoryBejo Duka0Eni Duka1Klaudio Peqini2University of Tirana, Faculty of Natural Sciences, Department of Physics, Tirana,University of Zurich, Department of Informatics, Zurich,University of Tirana, Faculty of Natural Sciences, Department of Physics, Tirana,The differences between monthly mean values of the observed geomagnetic field and monthly values predicted by different models of the internal geomagnetic field (named “model biases”) for the time period 2000-2015 at several geomagnetic observatories are analyzed. We notice that increasing the maximum degree of the model is not always followed by the decrease of such “model bias”. The time series of these “model biases” reduced by their average resulted to be approximately the same for all models and should represent the external (non-modeled) contribution to the observed geomagnetic field. These time series for different observatories (close or away to each other) are compared and their power spectra are analyzed. Such spectra have common features like the annual and semi-annual variation with some possible sporadic cases of seasonal variation.http://www.annalsofgeophysics.eu/index.php/annals/article/view/6971Geomagnetic field modelGeomagnetic observatoryInternal geomagnetic fieldPower spectrumSpherical harmonics |
| spellingShingle | Bejo Duka Eni Duka Klaudio Peqini Recovering external contribution from the monthly mean series of a given geomagnetic observatory Annals of Geophysics Geomagnetic field model Geomagnetic observatory Internal geomagnetic field Power spectrum Spherical harmonics |
| title | Recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| title_full | Recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| title_fullStr | Recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| title_full_unstemmed | Recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| title_short | Recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| title_sort | recovering external contribution from the monthly mean series of a given geomagnetic observatory |
| topic | Geomagnetic field model Geomagnetic observatory Internal geomagnetic field Power spectrum Spherical harmonics |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/6971 |
| work_keys_str_mv | AT bejoduka recoveringexternalcontributionfromthemonthlymeanseriesofagivengeomagneticobservatory AT eniduka recoveringexternalcontributionfromthemonthlymeanseriesofagivengeomagneticobservatory AT klaudiopeqini recoveringexternalcontributionfromthemonthlymeanseriesofagivengeomagneticobservatory |