In this paper, the main geomagnetic field models in Chinese region at epochs 1950.0, 1960.0, 1970-0 and 1980.0 were derived, and the characteristics of main geomagnetic field polynomial model in local region were analysed. On the basis of the main geomagnetic field models, the geomagnetic maps for 1950.0 to 1980.0 were constructed.
The contribution to the main geomagnetic field from high-degree harmonics of IGRF models is usually neglected, since the high-degree Gauss coefficients in IGRF models are much less than low-degree ones.
After optimization of design,including increasing the thickness of septum to 15 mm and adding a shielding hat with radius of 200 mm and thickness of 10 mm,the ratios of transverse stray field to main field were 0.8‰(in y direction) and 0.36‰(in x direction). The results were satisfactory to the requirement of RCS beam dynamics.
Magnetic field at the axis of its main field coil has reached 2.14 T. Length of uniform region is 14.5cm Degree of uniformity is +3.84%. It could be operated in persistent mode by means of superconducting switch.
Global anomalies of the main geomagnetic field and the dynamic model of their sources
The model of the main geomagnetic field sources, including 12 more dipoles in addition to the main dipole, is presented.
This made it possible to substantially smooth the time variations in the dipole parameters obtained previously and, on the other hand, to describe all global anomalies of the main geomagnetic field using this model.
The continuous spatial-temporal model of variations in the main geomagnetic field in the 20th century has been elaborated.
Motion of the north magnetic pole within the scope of the dynamic model of the main geomagnetic field sources
No GRB fell within the main field of view; they were all recorded by the "secondary optics" of the telescope.
At the same time, the observed rapid northward motion of the pole is related to the time variations in the parameters of 12 sources approximating the so-called nondipole part of the main field.
These adsorbents can therefore be used in gas-solid chromatography even for the elution of polar compounds, though gas-liquid-solid chromatography is the main field of application.
I discuss the status of one of these "four Why questions", that of function or survival value, and the relationship of Tinbergen's ethology to behavioural ecology, the main field asking functional questions about animal behaviour today.
Organic pollutant removal is the main field of water photocatalytic decontamination.