The 10th generation international geomagnetic reference field

Maus, Stefan; Macmillan, Susan; Chernova, Tatiana A.; Choi, Sungho; Dater, D.; Golovkov, V. P.; Lesur, Vincent; Lowes, F. J.; Lühr, H.; Mai, W.; McLean, S. J.; Olsen, Nils; Rother, M.; Sabaka, Terence J.; Thomson, Alan; Zvereva, T. I.

doi:10.1016/j.pepi.2005.03.006

Cited by 123 publications

(75 citation statements)

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“…Neutral densities, n(O), n(O 2 ) and n(N 2 ), that are used in the calculation of u in , are obtained from the NRLMSISE00 model (Picone et al, 2002). The geomagnetic dip angle I is from IGRF-10 (Maus et al, 2005). The signs of diffusive fluxes and velocities are defined as positive if the O + ions diffuse upwards along the magnetic field line, and negative if downward.…”

Section: Methodsmentioning

confidence: 99%

Field-aligned plasma diffusive fluxes in the topside ionosphere from radio occultation measurements by CHAMP

Chen¹,

Xu²,

Wang³

et al. 2009

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Methodsmentioning

confidence: 99%

Field-aligned plasma diffusive fluxes in the topside ionosphere from radio occultation measurements by CHAMP

Chen¹,

Xu²,

Wang³

et al. 2009

Journal of Atmospheric and Solar-Terrestrial Physics

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“…These were not present in the current data. To estimate the ionospheric RM during our observation, we use the global ionospheric maps (GIMs) of the vertical total electron content (VTEC) and the Earth's magnetic field model (International geomagnetic reference field; Maus et al 2005) from the casacore 5 library. The GIMs are generated by the Royal Observatory of Belgium using near real time data taken every 15 min by more than 100 Global Positioning System (GPS) sites spread across Europe (Bergeot et al 2009) 6 .…”

Section: Correcting For Faraday Rotation In the Earth's Ionospherementioning

confidence: 99%

Initial LOFAR observations of epoch of reionization windows

Jelić

Bruyn

Mevius

et al. 2014

A&A

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Aims. This study aims to characterise the polarized foreground emission in the ELAIS-N1 field and to address its possible implications for extracting of the cosmological 21 cm signal from the LOw-Frequency ARray -Epoch of Reionization (LOFAR-EoR) data. Methods. We used the high band antennas of LOFAR to image this region and RM-synthesis to unravel structures of polarized emission at high Galactic latitudes. Results. The brightness temperature of the detected Galactic emission is on average ∼4 K in polarized intensity and covers the range from -10 to +13 rad m −2 in Faraday depth. The total polarized intensity and polarization angle show a wide range of morphological features. We have also used the Westerbork Synthesis Radio Telescope (WSRT) at 350 MHz to image the same region. The LOFAR and WSRT images show a similar complex morphology at comparable brightness levels, but their spatial correlation is very low. The fractional polarization at 150 MHz, expressed as a percentage of the total intensity, amounts to ≈1.5%. There is no indication of diffuse emission in total intensity in the interferometric data, in line with results at higher frequencies Conclusions. The wide frequency range, high angular resolution, and high sensitivity make LOFAR an exquisite instrument for studying Galactic polarized emission at a resolution of ∼1-2 rad m −2 in Faraday depth. The different polarized patterns observed at 150 MHz and 350 MHz are consistent with different source distributions along the line of sight wring in a variety of Faraday thin regions of emission. The presence of polarized foregrounds is a serious complication for epoch of reionization experiments. To avoid the leakage of polarized emission into total intensity, which can depend on frequency, we need to calibrate the instrumental polarization across the field of view to a small fraction of 1%.

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“…It has been possible to derive models for the main field and its secular variation to unprecedented accuracy and resolution (e.g., Langlais et al 2003;. Such improvements benefit a wide community of users through the IGRF models regularly published by IAGA (e.g., MacMillan et al 2005;. This, in turn, allows better reduction of near-surface measurements and improves their consistency.…”

Section: Serial Approachmentioning

confidence: 99%

The Magnetic Field of the Earth’s Lithosphere

et al. 2010

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The lithospheric contribution to the Earth's magnetic field is concealed in magnetic field data that have now been measured over several decades from ground to satellite altitudes. The lithospheric field results from the superposition of induced and remanent magnetisations. It therefore brings an essential constraint on the magnetic properties of rocks of the Earth's sub-surface that would otherwise be difficult to characterize. Measuring, extracting, interpreting and even defining the magnetic field of the Earth's lithosphere is however challenging. In this paper, we review the difficulties encountered. We briefly summarize the various contributions to the Earth's magnetic field that hamper the correct identification of the lithospheric component. Such difficulties could be partially alleviated with the joint analysis of multi-level magnetic field observations, even though one cannot avoid making compromises in building models and maps of the magnetic field of the Earth's lithosphere E. Thébault ( ) 96 E. Thébault et al.at various altitudes. Keeping in mind these compromises is crucial when lithospheric field models are interpreted and correlated with other geophysical information. We illustrate this discussion with recent advances and results that were exploited to infer statistical properties of the Earth's lithosphere. The lessons learned in measuring and processing Earth's magnetic field data may prove fruitful in planetary exploration, where magnetism is one of the few remotely accessible internal properties.

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The 10th generation international geomagnetic reference field

Cited by 123 publications

References 1 publication

Field-aligned plasma diffusive fluxes in the topside ionosphere from radio occultation measurements by CHAMP

Field-aligned plasma diffusive fluxes in the topside ionosphere from radio occultation measurements by CHAMP

Initial LOFAR observations of epoch of reionization windows

The Magnetic Field of the Earth’s Lithosphere

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