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  • 1
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    Are we going towards a global planetary magnetic change? (2008)
    World Scientific and Engineering Academy and Society Press
    Details
    Publication Date: 2017-04-04
    Description: The dipolar part of the geomagnetic field has been decaying rapidly during the last few hundreds of years. In addition to this classical argument, from Information theory applied to geomagnetism, there are some evidences that the recent Earth magnetic field is showing characteristics typical of a reversal in progress. If this is true, many scientific and environmental questions will arise. For instance, it will be of particular interest to monitor the time-space dynamics the South Atlantic Anomaly, where the magnetic field is strongly reduced (a sort of "planetary magnetic hole"). Here we find one of the most favourite places where Low Earth Orbiting (LEO) satellites are lost or present some damages, due to the vicinity of "clouds" of electric particles (Van Allen belts) to the Earth's surface. The decay of the field will also decrease the screening effect to the solar wind and cosmic charges, so enhancing the cosmic radiation illuminating our planet: possible negative consequences are expected in terms of increase of skin cancers. Also important will be the study of the possible evolution of the core dynamics that will be generating this specific condition of the geomagnetic field.
    Description: Published
    Description: Malta, September 11-13, 2008
    Description: 1.6. Osservazioni di geomagnetismo
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: 3.4. Geomagnetismo
    Description: open
    Keywords: Geomagnetic field ; Geomagnetic reversal ; Global Change ; Information theory ; Shannon information ; 04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics ; 04. Solid Earth::04.05. Geomagnetism::04.05.01. Dynamo theory ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 2
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    How persistent is the present trend of the geomagntic field to decay and, possibly, to reverse? (2007)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: Recent studies provide evidence for a possible imminent change of polarity or an excursion of the geomagnetic field. In this paper we explore the possibility that the present trends are persistent, looking at the behaviour of some physical quantities of the recent geomagnetic field with particular attention to the last century. Analysis of the mean square value of the field over the last 400 years shows a linear decay that if extrapolated will be zero in around 1000 years, while if we extrapolate the field over Antarctica it will go to zero in around 300 years. The information content of the geomagnetic field has been decaying from around 1690, but began to decrease more rapidly at around 1775 and even more rapidly after 1900. An intermittent synchronicity between the exponential field decay and the increase latitudinal speed of the south geomagnetic pole with similar (decaying or growing) timescales can be interpreted as evidence for a present persistent turbulence of the geomagnetic field. From this work it emerges that the present situation is likely to persist further into the future, probably for another century, but longer predictions are not possible.
    Description: Published
    Description: 217-226
    Description: 3.4. Geomagnetismo
    Description: JCR Journal
    Description: reserved
    Keywords: Geomagnetic field ; geomagnetic reversal ; persistent turbolence ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    A note on two expressions for the spatial power spectrum of the geomagnetic field (2006)
    Details
    Publication Date: 2019-11-04
    Description: The spatial power spectrum of the geomagnetic field is usually assumed to be exponential in the spherical harmonic degree (n). An equally valid assumption, however, is that the spectrum at the surface of the Earth's core has a power-law dependence on n. Some implications of these two assumptions are discussed, noting that, in the first case, a value for the core radius can be derived from the slope of the spectrum and, in the second, that the spectrum for radii greater than the radius of the core is a mixture of the exponential and power-law types.
    Description: JCR Journal
    Description: open
    Keywords: Geomagnetic field ; spatial power spectrum ; 04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 734319 bytes
    Format: application/pdf
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