Author: Publisher:
ISBN:
Category : Sun-spots
Languages : en
Pages : 132
Book Description
Sunspot Numbers, 1610-1985
Author: Energy Research Abstracts
Author: Scientific and Technical Aerospace Reports
Author: Report UAG.
Author: The Origin and Dynamics of Solar Magnetism
Author: M.J. ThompsonPublisher: Springer Science & Business Media
ISBN: 1441902392
Category : Science
Languages : en
Pages : 424
Book Description
Starting in 1995 numerical modeling of the Earth’s dynamo has ourished with remarkable success. Direct numerical simulation of convection-driven MHD- ow in a rotating spherical shell show magnetic elds that resemble the geomagnetic eld in many respects: they are dominated by the axial dipole of approximately the right strength, they show spatial power spectra similar to that of Earth, and the magnetic eld morphology and the temporal var- tion of the eld resembles that of the geomagnetic eld (Christensen and Wicht 2007). Some models show stochastic dipole reversals whose details agree with what has been inferred from paleomagnetic data (Glatzmaier and Roberts 1995; Kutzner and Christensen 2002; Wicht 2005). While these models represent direct numerical simulations of the fundamental MHD equations without parameterized induction effects, they do not match actual pla- tary conditions in a number of respects. Speci cally, they rotate too slowly, are much less turbulent, and use a viscosity and thermal diffusivity that is far too large in comparison to magnetic diffusivity. Because of these discrepancies, the success of geodynamo models may seem surprising. In order to better understand the extent to which the models are applicable to planetary dynamos, scaling laws that relate basic properties of the dynamo to the fundamental control parameters play an important role. In recent years rst attempts have been made to derive such scaling laws from a set of numerical simulations that span the accessible parameter space (Christensen and Tilgner 2004; Christensen and Aubert 2006).
Solar-geophysical Data
Author: Ionospheres
Author: Robert SchunkPublisher: Cambridge University Press
ISBN: 0521877067
Category : Science
Languages : en
Pages : 641
Book Description
Describes the physical, plasma and chemical processes controlling ionospheres, upper atmospheres and exospheres, for researchers and graduates.
On the Importance of Cycle Minimum in Sunspot Cycle Prediction
Author: Robert M. WilsonPublisher:
ISBN:
Category : Solar cycle
Languages : en
Pages : 20
Book Description
Geomagnetic Polar Cap (PC) Index, 1975-1993
Author: World Data Center A for Solar-Terrestrial PhysicsPublisher:
ISBN:
Category : Geomagnetic indexes
Languages : en
Pages : 310
Book Description
Volcanism, Cold Temperature, and Paucity of Sunspot Observing Days (1818-1858): A Connection?
Author: Robert M. WilsonPublisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 40
Book Description
During the interval of 1818-1858, several curious decreases in the number of sunspot observing days per year are noted in the observing record of Samuel Heinrich Schwabe, the discoverer of the sunspot cycle, and in the reconstructed record of Rudolf Wolf, the founder of the now familiar relative sunspot number. These decreases appear to be nonrandom in nature and often extended for 1-3 yr (or more). Comparison of these decreases with equivalent annual mean temperature (both annual means and 4-yr moving averages), as recorded at Armagh Observatory (Northern Ireland), indicates that the temperature during the years of decreased number of observing days trended downward near the start of each decrease and upward (suggesting some sort of recovery) just before the end of each decrease. The drop in equivalent annual mean temperature associated with each decrease, as determined from the moving averages, measured about 0.1-0.7°C. The decreases in number of observing days are found to be closely related to the occurrences of large, cataclysmic volcanic eruptions in the tropics or northern hemisphere.