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Wavelet analysis applied to magnetograms: Singularity detections related to geomagnetic storms
When the interplanetary magnetic field carried by the solar wind opposes to the Earth intrinsic magnetic field, a substantial transfer of energy into the terrestrial magnetosphere takes place. If this condition persists for several hours, the magnetosphere becomes very disturbed. As a result, at mid...
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| Published in: | Journal of atmospheric and solar-terrestrial physics 2005-12, Vol.67 (17), p.1827-1836 |
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| Main Authors: | , , , |
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| cites | cdi_FETCH-LOGICAL-c471t-22d5bd6c9e59e5ac3613913040d9af3f5b51edf46c6fdb71d9f78f2b47b333433 |
| container_end_page | 1836 |
| container_issue | 17 |
| container_start_page | 1827 |
| container_title | Journal of atmospheric and solar-terrestrial physics |
| container_volume | 67 |
| creator | Mendes, Odim Oliveira Domingues, Margarete Mendes da Costa, Aracy Clúa de Gonzalez, Alícia L. |
| description | When the interplanetary magnetic field carried by the solar wind opposes to the Earth intrinsic magnetic field, a substantial transfer of energy into the terrestrial magnetosphere takes place. If this condition persists for several hours, the magnetosphere becomes very disturbed. As a result, at mid-to-low latitudes a ring current starts to develop and at high latitudes ionospheric currents (electrojet and field-aligned currents) dominate. The ring current provides the geomagnetic conditions for magnetic storms to settle down. Wavelet analysis is becoming an usual tool since they allow the decomposition of data, functions or operators into different frequency or scale components. Accordingly, wavelet transforms seem to be suited to analyze short-lived high-frequency phenomena such as discontinuities (
shocks) in signals and transient structures. In this work, the remarkable ability of wavelets to highlight the singularities associated with discontinuities present in the horizontal component of the Earth's magnetic field is explored. Magnetograms obtained at five magnetic stations for two geomagnetic storms have been analyzed by a Daubechies orthogonal wavelet transform. The wavelet coefficient magnitudes at three levels have been studied. In both cases, the physical discontinuities in the horizontal component of the geomagnetic field are clearly detected by means of these coefficients identifying the disturbed interval related to geomagnetic storms. Wavelet analysis has proved to be a useful tool in the identification of the geomagnetic storms using non-processed data. |
| doi_str_mv | 10.1016/j.jastp.2005.07.004 |
| format | article |
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shocks) in signals and transient structures. In this work, the remarkable ability of wavelets to highlight the singularities associated with discontinuities present in the horizontal component of the Earth's magnetic field is explored. Magnetograms obtained at five magnetic stations for two geomagnetic storms have been analyzed by a Daubechies orthogonal wavelet transform. The wavelet coefficient magnitudes at three levels have been studied. In both cases, the physical discontinuities in the horizontal component of the geomagnetic field are clearly detected by means of these coefficients identifying the disturbed interval related to geomagnetic storms. Wavelet analysis has proved to be a useful tool in the identification of the geomagnetic storms using non-processed data.</description><identifier>ISSN: 1364-6826</identifier><identifier>EISSN: 1879-1824</identifier><identifier>DOI: 10.1016/j.jastp.2005.07.004</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Geomagnetic storm ; Multi-resolution analysis ; Physics of the high neutral atmosphere ; Physics of the ionosphere ; Physics of the magnetosphere ; Planetary electrodynamics ; Sun–Earth coupling ; Wavelet analysis</subject><ispartof>Journal of atmospheric and solar-terrestrial physics, 2005-12, Vol.67 (17), p.1827-1836</ispartof><rights>2005 Elsevier Ltd</rights><rights>2006 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c471t-22d5bd6c9e59e5ac3613913040d9af3f5b51edf46c6fdb71d9f78f2b47b333433</citedby><cites>FETCH-LOGICAL-c471t-22d5bd6c9e59e5ac3613913040d9af3f5b51edf46c6fdb71d9f78f2b47b333433</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>310,311,315,786,790,795,796,23958,23959,25170,27957,27958</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=17446904$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Mendes, Odim</creatorcontrib><creatorcontrib>Oliveira Domingues, Margarete</creatorcontrib><creatorcontrib>Mendes da Costa, Aracy</creatorcontrib><creatorcontrib>Clúa de Gonzalez, Alícia L.</creatorcontrib><title>Wavelet analysis applied to magnetograms: Singularity detections related to geomagnetic storms</title><title>Journal of atmospheric and solar-terrestrial physics</title><description>When the interplanetary magnetic field carried by the solar wind opposes to the Earth intrinsic magnetic field, a substantial transfer of energy into the terrestrial magnetosphere takes place. If this condition persists for several hours, the magnetosphere becomes very disturbed. As a result, at mid-to-low latitudes a ring current starts to develop and at high latitudes ionospheric currents (electrojet and field-aligned currents) dominate. The ring current provides the geomagnetic conditions for magnetic storms to settle down. Wavelet analysis is becoming an usual tool since they allow the decomposition of data, functions or operators into different frequency or scale components. Accordingly, wavelet transforms seem to be suited to analyze short-lived high-frequency phenomena such as discontinuities (
shocks) in signals and transient structures. In this work, the remarkable ability of wavelets to highlight the singularities associated with discontinuities present in the horizontal component of the Earth's magnetic field is explored. Magnetograms obtained at five magnetic stations for two geomagnetic storms have been analyzed by a Daubechies orthogonal wavelet transform. The wavelet coefficient magnitudes at three levels have been studied. In both cases, the physical discontinuities in the horizontal component of the geomagnetic field are clearly detected by means of these coefficients identifying the disturbed interval related to geomagnetic storms. 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shocks) in signals and transient structures. In this work, the remarkable ability of wavelets to highlight the singularities associated with discontinuities present in the horizontal component of the Earth's magnetic field is explored. Magnetograms obtained at five magnetic stations for two geomagnetic storms have been analyzed by a Daubechies orthogonal wavelet transform. The wavelet coefficient magnitudes at three levels have been studied. In both cases, the physical discontinuities in the horizontal component of the geomagnetic field are clearly detected by means of these coefficients identifying the disturbed interval related to geomagnetic storms. Wavelet analysis has proved to be a useful tool in the identification of the geomagnetic storms using non-processed data.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.jastp.2005.07.004</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of atmospheric and solar-terrestrial physics, 2005-12, Vol.67 (17), p.1827-1836 |
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| language | eng |
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| source | ScienceDirect Freedom Collection 2022-2024 |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Geomagnetic storm Multi-resolution analysis Physics of the high neutral atmosphere Physics of the ionosphere Physics of the magnetosphere Planetary electrodynamics Sun–Earth coupling Wavelet analysis |
| title | Wavelet analysis applied to magnetograms: Singularity detections related to geomagnetic storms |
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