International Geomagnetic Reference Field—the tenth generation

Macmillan, Susan; Maus, Stefan

doi:10.1186/bf03351896

Cited by 133 publications

(104 citation statements)

References 7 publications

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“…We note that theoretical predictions do not take into account sudden and temporal ionospheric changes. We have used the International Geomagnetic Reference Field (IGRF) Model 14 (MacMillan & Maus 2005), along with the International Reference Ionosphere (IRI) 2007 15 (Bilitza & Reinisch 2008) to estimate the ionospheric RM during the observations. It has been found that the ionospheric RM above the ATCA is negative (geomagnetic field points away from the center of the earth) and that above the WSRT is positive (geomagnetic field points toward the center of the earth) with a magnitude 1 rad m −2 , which is consistent with the estimation reported by Tinbergen (1996).…”

Section: Rm Computationmentioning

confidence: 99%

A Survey of Extragalactic Faraday Rotation at High Galactic Latitude: The Vertical Magnetic Field of the Milky Way Toward the Galactic Poles

Mao

Gaensler

Haverkorn

et al. 2010

ApJ

155

219

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We present a study of the vertical magnetic field of the Milky Way toward the Galactic poles, determined from observations of Faraday rotation toward more than 1000 polarized extragalactic radio sources at Galactic latitudes |b| 77 • , using the Westerbork Radio Synthesis Telescope and the Australia Telescope Compact Array. We find median rotation measures (RMs) of 0.0 ± 0.5 rad m −2 and +6.3 ± 0.7 rad m −2 toward the north and south Galactic poles, respectively, demonstrating that there is no coherent vertical magnetic field in the Milky Way at the Sun's position. If this is a global property of the Milky Way's magnetism, then the lack of symmetry across the disk rules out pure dipole or quadrupole geometries for the Galactic magnetic field. The angular fluctuations in RM seen in our data show no preferred scale within the range ≈0.• 1 to ≈25 • . The observed standard deviation in RM of ∼9 rad m −2 then implies an upper limit of ∼1 μG on the strength of the random magnetic field in the warm ionized medium at high Galactic latitudes.

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Section: Rm Computationmentioning

confidence: 99%

A Survey of Extragalactic Faraday Rotation at High Galactic Latitude: The Vertical Magnetic Field of the Milky Way Toward the Galactic Poles

Mao

Gaensler

Haverkorn

et al. 2010

ApJ

155

219

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“…The latest version is the tenth generation of the model and was released by the International Association of Geomagnetism and Aeronomy [19]. It is described mathematically by a series of spherical harmonics, the coefficients of which are estimated on the order of 13.…”

Section: A Earth Magnetic Field and Free Electrons In The Ionospherementioning

confidence: 99%

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

Jehle

Ruegg

Zuberbuhler

et al. 2009

IEEE Trans. Geosci. Remote Sensing

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“…Mathematical models (e.g. IGRF, see MacMillan and Maus, 2005) are usually used to make world maps of the Earth's magnetic field and of its secular variation. These models based on the international co-operation among geomagnetic field data contributors and modelers are good for understanding the principal properties of the magnetic field in the region hosting the observatories.…”

Section: Discussionmentioning

confidence: 99%

The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica

Meloni¹,

Cafarella²,

Michelis³

et al. 2007

Open-File Report

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Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent groundbased observatories does not permit a uniform coverage of the examined area. Furthermore, the magnetic records are characterized by intense external disturbances and noise that make the analysis of the magnetic field difficult. To improve our knowledge of the secular variation and detect the presence of secular variation impulses (geomagnetic jerks) in Antarctica, we use both observatory data and the CM4 quiet time magnetic field model. In particular CM4 improves our knowledge of geomagnetic jerks over Antarctica through the study of the sign changes of the secular acceleration maps.

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International Geomagnetic Reference Field—the tenth generation

Cited by 133 publications

References 7 publications

A Survey of Extragalactic Faraday Rotation at High Galactic Latitude: The Vertical Magnetic Field of the Milky Way Toward the Galactic Poles

A Survey of Extragalactic Faraday Rotation at High Galactic Latitude: The Vertical Magnetic Field of the Milky Way Toward the Galactic Poles

Measurement of Ionospheric Faraday Rotation in Simulated and Real Spaceborne SAR Data

The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica

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