Geomagnetic Observations for Main Field Studies: From Ground to Space

Matzka, Jürgen; Chulliat, Arnaud; Mandea, Mioara; Finlay, Christopher C.; Qamili, Enkelejda

doi:10.1007/s11214-010-9693-4

Cited by 66 publications

(54 citation statements)

References 77 publications

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“…Thus the two geometrical constraints (1) and (2) do not substantially alter the standard flows obtained by inverting SV. Instead, known features are adjusted in order that these conditions can be exactly verified, particularly for the most recent years when the overall quality of observatory data has improved due to better instruments and the advent of international quality standards (Gillet et al 2009b;Matzka et al 2010).…”

Section: Quasi-geostrophic Core Flow Inversionsmentioning

confidence: 99%

Short Timescale Core Dynamics: Theory and Observations

Finlay¹,

Dumberry²,

Chulliat³

et al. 2010

Terrestrial Magnetism

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Fluid motions in the Earth's core produce changes in the geomagnetic field (secular variation) and are also an important ingredient in the planet's rotational dynamics. In this article we review current understanding of core dynamics focusing on short timescales of years to centuries. We describe both theoretical models and what may be inferred from geomagnetic and geodetic observations. The kinematic concepts of frozen flux and magnetic diffusion are discussed along with relevant dynamical regimes of magnetostrophic balance, tangential geostrophy, and quasi-geostrophy. An introduction is given to free modes and waves that are expected to be present in Earth's core including axisymmetric torsional oscillations and non-axisymmetric Magnetic-Coriolis waves. We focus on important recent developments and promising directions for future investigations.

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Section: Quasi-geostrophic Core Flow Inversionsmentioning

confidence: 99%

Short Timescale Core Dynamics: Theory and Observations

Finlay¹,

Dumberry²,

Chulliat³

et al. 2010

Terrestrial Magnetism

Self Cite

View full text Add to dashboard Cite

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“…These 10 absolute measurements revealed a difference in the absolute level of the observatory of +1.5 nT in the horizontal component (H ) and +0.4 (≈ 3 nT) in the declination (D) after the removal of these objects while no difference was found for the vertical component. We note that any change in the absolute level should not exceed one nT in order to preserve the accuracy of the secular variation data from the TTB observatory (Matzka et al, 2010). This could have been achieved by correcting all future or past data with an appropriate constant offset.…”

Section: Absolute Measurementsmentioning

confidence: 99%

The magnetic observatory on Tatuoca, Belém, Brazil: history and recent developments

Morschhauser

Soares

Haseloff

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. The Tatuoca magnetic observatory (IAGA code: TTB) is located on a small island in the Amazonian delta in the state of Pará, Brazil. Its location close to the geomagnetic equator and within the South Atlantic Anomaly offers a high scientific return of the observatory's data. A joint effort by the National Observatory of Brazil (ON) and the GFZ German Research Centre for Geosciences (GFZ) was undertaken, starting from 2015 in order to modernise the observatory with the goal of joining the INTERMAGNET network and to provide real-time data access. In this paper, we will describe the history of the observatory, recent improvements, and plans for the near future. In addition, we will give some comments on absolute observations of the geomagnetic field near the geomagnetic equator.

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“…Matzka et al, 2010). These data are essential to understand the geomagnetic field, its sources and its temporal variations (e.g.…”

Section: Introductionmentioning

confidence: 99%

A low-power data acquisition system for geomagnetic observatories and variometer stations

Morschhauser

Haseloff

Bronkalla

et al. 2017

Geosci. Instrum. Method. Data Syst.

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Abstract. A modern geomagnetic observatory must provide data of high stability, continuity, and resolution. The INTER-MAGNET network has therefore specified quantitative criteria to ensure a high quality standard of geomagnetic observatories. Here, we present a new data acquisition system which was designed to meet these criteria, in particular with respect to 1 Hz data. This system is based on a Raspberry Pi embedded PC and runs a C++ data acquisition software. As a result, the data acquisition system is modular, cheap, and flexible, and it can be operated in remote areas with limited power supply. In addition, the system is capable of near-realtime data transmission, using a reverse SSH tunnel to work with any network available. The system hardware was successfully tested at the Niemegk observatory for a period of 1 year and subsequently installed at the Tatuoca observatory in Brazil.

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Geomagnetic Observations for Main Field Studies: From Ground to Space

Cited by 66 publications

References 77 publications

Short Timescale Core Dynamics: Theory and Observations

Short Timescale Core Dynamics: Theory and Observations

The magnetic observatory on Tatuoca, Belém, Brazil: history and recent developments

A low-power data acquisition system for geomagnetic observatories and variometer stations

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