Sentences with phrase «based geomagnetic»
The study brought together data from several spacecraft, as well as supporting observations from solar wind probes and ground - based geomagnetic observatories, to develop a model that describes the Earth's magnetic field and its interaction with the solar wind not just theoretically as had been the case previously, but based on actual measurements.
http://sci.esa.int/ Not exact matches
«This discrepancy between 1D - and 3D - based calculations of the 1989 storm demonstrates the importance of realistic data, rather than relying on previous 1D models, to determine the impact that a geomagnetic storm has on power grids,» Lucas said.
But there is another magnetically based north pole: the north geomagnetic pole.
The research entitled «Network analysis of geomagnetic substorms using the SuperMAG database of ground - based magnetometer stations» has just been published in the Journal of Geophysical Research: Space Physics by a team of researchers from the Centre for Fusion, Space and Astrophysics in the Department of Physics at the University of Warwick; The Department of Physics and Technology, University of Bergen, Bergen, Norway; and The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA.
The team investigated patterns of magnetic reversals — another method to determine age based on knowledge about an era's magnetic orientation — and calibrated the sediments containing the fossils using Geomagnetic Polarity Time Scale (GPTS).
Based on the theoretical geomagnetic field computer models (Which are all incorrect as the geomagnetic field is not generated in the core.
Re «I believe, sudden, rapid, and sever global cooling is possible and likely based on the paleoclimatic and paleo - geomagnetic records.»
I believe, sudden, rapid, and sever global cooling is possible and likely based on the paleoclimatic and paleo - geomagnetic records.
The SWPC is based in Boulder, Colo., and observes the Sun in real time from both ground - based observatories and satellites in order to predict geomagnetic storms.
The JPL - Oxford University paper is based on the geomagnetic measurements http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/13763/1/00-0133.pdf
«The solar and volcanic forcings we use are derived from reconstructions based on proxy data and are therefore also subject to considerable uncertainties, although recent explosive volcanic eruptions are likely to have cooled climate, and independent records of solar activity levels inferred from the cosmogenic isotope 10Be (43) and geomagnetic records (44) provide support to reconstructions (22, 45) that show generally increasing solar activity during the 20th century (12).»
The BHMF trend thus obtained is then compared with the most recent reconstructions of the near - Earth HMF strength based on geomagnetic, sunspot number, and cosmogenic isotope data.
Typical reconstructions of historic heliospheric magnetic field (HMF) BHMF are based on the analysis of the sunspot activity, geomagnetic data or on measurement of cosmogenic isotopes stored in terrestrial reservoirs like trees (14C) and ice cores (10Be).
The modeling approach is based on presenting the ionospheric parameter (most frequently the F - layer critical frequency foF2) by analytical expressions as a function of one or more geomagnetic or solar indices, called drivers.
http://www.agci.org/docs/lean.pdf «Global (and regional) surface temperature fluctuations in the past 120 years reflect, as in the space era, a combination of solar, volcanic, ENSO, and anthropogenic influences, with relative contributions shown in Figure 6.22 The adopted solar brightness changes in this scenario are based on a solar surface flux transport model; although long - term changes are «50 % larger than the 11 - year irradiance cycle, they are significantly smaller than the original estimates based on variations in Sun - like stars and geomagnetic activity.
A number of new millennial - scale geomagnetic field reconstructions have been published over the last years, based on improved global archeo - and paleomagnetic data compilations.
The somewhat contradictory results for the similarity of radionuclide - based dipole reconstructions and geomagnetic field models on these time scales point out that geomagnetic field models have to be improved further before they can provide a truly robust means to eliminate the influence of geomagnetic variability in cosmogenic radionuclide production studies.
Here we review several spherical harmonic models and compare their dipole field predictions to reconstructions based on virtual axial dipole moments and virtual geomagnetic poles.
Nilsson et al. (2011) computed a synthetic tilt modulated VADM record for a location in western Eurasia based on dipole strength estimates obtained from 10Be flux and taking into account the dipole tilt based on the reconstruction of the northern geomagnetic pole position from VGP of globally distributed sediment records.
Similarities in these variations to the reconstructions based on geomagnetic data hardly seem to exist.
For comparison purposes, we base our calculations on the assumption that the variations seen in 14C and 10Be records after applying different low - pass filters originate only from geomagnetic dipole variations.
Dipole moment reconstructions from geomagnetic models CALS3k.3 (light blue) and CALS3k.4 (dark blue) and based on 14C (brown) and 10Be (green) records.
The 14C production record and the 10Be flux records have been converted into geomagnetic field intensity estimates based on the results of Masarik & Beer (1999) after the low - pass filtering.