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| Titel |
CalMagNet – an array of search coil magnetometers monitoring ultra low frequency activity in California |
| VerfasserIn |
J. Cutler, J. Bortnik, C. Dunson, J. Doering, T. Bleier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 2 ; Nr. 8, no. 2 (2008-04-15), S.359-368 |
| Datensatznummer |
250005415
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| Publikation (Nr.) |
 copernicus.org/nhess-8-359-2008.pdf |
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| Zusammenfassung |
| The California Magnetometer Network (CalMagNet)
consists of sixty-eight triaxial search-coil magnetometer systems measuring
Ultra Low Frequency (ULF), 0.001–16 Hz, magnetic field fluctuations in California.
CalMagNet provides data for comprehensive multi-point measurements of specific events in the
Pc 1–Pc 5 range at mid-latitudes as well as a systematic, long-term study
of ULF signals in active fault regions in California.
Typical events include geomagnetic micropulsations and spectral resonant structures
associated with the ionospheric Alfvén resonator.
This paper provides a technical overview of the CalMagNet sensors and data processing systems.
The network is composed of ten reference stations and fifty-eight local monitoring stations.
The primary instruments at each site are three orthogonal induction coil magnetometers.
A geophone monitors local site vibration. The systems are designed for future sensor
expansion and include resources for monitoring four additional channels.
Data is currently sampled at 32 samples per second with a 24-bit converter and time tagged
with a GPS-based timing system. Several examples of representative magnetic
fluctuations and signals as measured by the array are given. |
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