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| Titel |
On the man-made contamination on ULF measurements: evidence for disturbances related to an electrified DC railway |
| VerfasserIn |
U. Villante, A. Piancatelli, P. Palangio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 9 ; Nr. 32, no. 9 (2014-09-16), S.1153-1161 |
| Datensatznummer |
250121109
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| Publikation (Nr.) |
 copernicus.org/angeo-32-1153-2014.pdf |
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| Zusammenfassung |
| An analysis of measurements performed at L'Aquila (Italy) during a deep
minimum of solar and magnetospheric activity (2008–2010) allowed for the
evaluation of possible contamination of the ultralow-frequency (ULF) spectrum (f ≈
1–500 mHz) from artificial disturbances, practically in absence of natural
signals. In addition, the city evacuation and the interruption of all
industrial and social activities after the strong earthquake of 6 April 2009
allowed also for the examination of possible changes of the contamination level under
remarkably changed environmental conditions. Our analysis reveals a
persistent, season-independent, artificial signal, with the same
characteristics in the H and Z components, that affects during daytime
hours the entire spectrum; such contamination persists after the city
evacuation. We speculate that the DC electrified railway (located ≈
33 km from the Geomagnetic Observatory of L'Aquila, it maintained the same train traffic after
the earthquake) is responsible for the observed disturbances. |
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