Instruments and Methodologies for Measurement of the Earth’s Magnetic Field

Hrvoic, Ivan; Newitt, Lawrence R.

doi:10.1007/978-90-481-9858-0_5

Cited by 19 publications

(14 citation statements)

References 28 publications

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“…The reliability of the recorded transient signal depends on the quality of the F data. First, overhauser magnetometers [ Hrvoic , ] do not record mechanical shaking effects that produce rapid changes in the magnetic field components ( X , Y , and Z ). Note that the transient signal in F exists beyond the first tens of seconds, after the earthquake shaking ceases.…”

Section: Application and Resultsmentioning

confidence: 99%

Experimental evidence of electrification processes during the 2009 L'Aquila earthquake main shock

Nenovski

2015

Geophysical Research Letters

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Two types of coseismic magnetic field events are simultaneously observed: transient offset events and magnetic field signal that occurred at the destructive, M w 6.1 L'Aquila earthquake main shock. The offset event, conventionally interpreted as a signature of piezomagnetic effects, however, could not be explained as such. In the second type of coseismic event, the transient magnetic signal starts simultaneously with the offset event and reaches amplitude of 0.8 nT in the total magnetic field. The signal is a local one; its amplitude shape resembles diffusion-like form with time scale characteristics that are indicative for a source deep in the crust. The polarity of the transient signal is in the horizontal plane and nearly parallel to the L'Aquila fault strike. NENOVSKI EVIDENCE OF ELECTRIFICATION PROCESSES 7476

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Section: Application and Resultsmentioning

confidence: 99%

Experimental evidence of electrification processes during the 2009 L'Aquila earthquake main shock

Nenovski

2015

Geophysical Research Letters

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“…This is comparable with the accuracy that can be obtained by a skilled observer with a DI-flux. Although this instrument has given results that agree closely with those obtained by manual observations, long-term reliability under adverse conditions has yet to be demonstrated (Hrvoic and Newitt, 2011).…”

Section: Introductionmentioning

confidence: 64%

“…However, as for any institute that runs remote magnetic observatories, the automation of the absolute observations is of particular importance and the most challenging item, especially when the station is unmanned most of the time. At present, there have been very few attempts to automate absolute observations (Auster et al, 2007(Auster et al, , 2009Hrvoic and Newitt, 2011). The one with the longest history is the AutoDIF (Rasson and Gonsette, 2011;Gonsette and Rasson, 2013), which is an automatic instrument designed to reproduce the manual measurement sequence of the DI-flux.…”

Section: Introductionmentioning

confidence: 99%

An automatic DI-flux at the Livingston Island geomagnetic observatory, Antarctica: requirements and lessons learned

Marsal¹,

Curto²,

Torta³

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. The DI-flux, consisting of a fluxgate magnetometer coupled with a theodolite, is used for the absolute manual measurement of the magnetic field angles in most groundbased observatories worldwide. Commercial solutions for an automated DI-flux have recently been developed by the Royal Meteorological Institute of Belgium (RMI), and are practically restricted to the AutoDIF and its variant, the GyroDIF. In this article, we analyze the pros and cons of both instruments in terms of its suitability for installation at the partially manned geomagnetic observatory of Livingston Island (LIV), Antarctica. We conclude that the GyroDIF, even if it is less accurate and more power demanding, is more suitable than the AutoDIF for harsh conditions due to the simpler infrastructure that is necessary. Power constraints in the Spanish Antarctic Station Juan Carlos I (ASJI) during the unmanned season require an energy-efficient design of the thermally regulated box housing the instrument as well as thorough power management. Our experiences can benefit the geomagnetic community, which often faces similar challenges.

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“…The corresponding time series reflects the consistency of the operation of vector and scalar magnetometers, which in turn enables continuous monitoring of the quality of work of the devices. At the same time, this approach ensures the quality control of the variometer to a greater extent because current scalar magnetometers are characterized by a long-term stable operation and practically no sensitivity to external climatic influences (Hrvoic and Newitt 2011). It should be noted that such approach to quality control is not applicable for error detection in the variometer data resulting from whole and permanent motions like drifts due to pier inclinations or rotations.…”

Section: Calculation Of Regular Baselinesmentioning

confidence: 99%

On the feasibility of routine baseline improvement in processing of geomagnetic observatory data

Soloviev

Lesur

Kudin

2018

Earth Planets Space

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We propose a new approach to the calculation of regular baselines at magnetic observatories. The proposed approach is based on the simultaneous analysis of the irregular absolute observations and the continuous timeseries deltaF, widely used for estimating the data quality. The systematic deltaF analysis allows to take into account all available information about the operation of observatory instruments (i.e., continuous records of the field variations and its modulus) in the intervals between the times of absolute observations, as compared to the traditional baseline calculation where only spot values are considered. To establish a connection with the observed spot baseline values, we introduce a function for approximate evaluation of the intermediate baseline values. An important feature of the algorithm is its quantitative estimation of the resulting data precision and thus determination of the problematic fragments in raw data. We analyze the robustness of the algorithm operation using synthetic data sets. We also compare baselines and definitive data derived by the proposed algorithm with those derived by the traditional approach using Saint Petersburg observatory data, recorded in 2015 and accepted by INTERMAGNET. It is shown that the proposed method allows to essentially improve the resulting data quality when baseline data are not good enough. The obtained results prove that the baseline variability in time might be quite rapid.

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Instruments and Methodologies for Measurement of the Earth’s Magnetic Field

Cited by 19 publications

References 28 publications

Experimental evidence of electrification processes during the 2009 L'Aquila earthquake main shock

Experimental evidence of electrification processes during the 2009 L'Aquila earthquake main shock

An automatic DI-flux at the Livingston Island geomagnetic observatory, Antarctica: requirements and lessons learned

On the feasibility of routine baseline improvement in processing of geomagnetic observatory data

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