We present a new compilation and analysis of historical geomagnetic measurements made in Western Europe before AD 1750. The dataset in its ensemble provides a coherent evolution of magnetic field directions. Several data points excluded from previous analyses actually appear very consistent with most of the present compilation. A new average historical curve is computed for Paris, which is in v...

Mid-term quasi-periodicities in solar coronal mass ejections (CMEs) during the most recent solar maximum cycle 23 are reported here for the first time using the fouryear data (February 5, 1999 to February 10, 2003) of the Large Angle Spectrometric Coronagraph (LASCO) onboard the Solar and Heliospheric Observatory (SOHO). In parallel, mid-term quasi-periodicities in solar X-ray flares (class >M5...

*Correspondence: Andrew J. Biggin, Geomagnetism Laboratory, Oliver Lodge Laboratories, School of Environmental Sciences, University of Liverpool, Oxford Road, Liverpool L69 7ZE, UK e-mail: [email protected] Records of reversal frequency support forcing of the geodynamo over geological timescales but obtaining these for earlier times (e.g., the Precambrian) is a major challenge. Changes in the me...

Abstract Each International Geomagnetic Reference Field (IGRF) model released under the auspices of Association Geomagnetism and Aeronomy comprises a secular variation component that describes evolution main magnetic field anticipated for 5 years to come. Every Gauss coefficient, up spherical harmonic degree order 8, is assumed undergo its own independent linear evolution. With mathematical cor...

S U M M A R Y The problem of decomposing irregular data on the sphere into a set of spherical harmonics is common in many fields of geosciences where it is necessary to build a quantitative understanding of a globally varying field. For example, in global seismology, a compressional or shear wave speed that emerges from tomographic images is used to interpret current state and composition of th...

In the history of geomagnetism, geoelectricity and space science including solar terrestrial physics, ground magnetic records have been demonstrated to be a powerful tool for monitoring the levels of overall geomagnetic activity. For example, the Kp and ap indices having perhaps the long-history geomagnetic indices have and are being used as space weather parameters, where “p” stands for “plane...

Background. The effect of geomagnetism on human immunity has so far been studied through long-term observations. We set ourselves the goal detecting immediate immunotropic effects Earth's magnetic field by analyzing relationships between parameters and geomagnetic Ap-index. Material methods. object observation were 74 patients with multiple sclerosis 14 radiculopathies, who in period from Septe...