Intercomparison of ionospheric observations obtained by 10C-type ionosonde and by FMCW-type ionosondes at Syowa station, Antarctica - Part.2 -

第3回極域科学シンポジウム/第36回極域宙空圏シンポジウム 11月26日（月）、27日（火） 国立極地研究所 2階ラウン

Field strength measurement of LF standard frequency signals along the icebreaker Shirase cruise, JARE52 - preliminary result

第2回極域科学シンポジウム/第35回極域宙空圏シンポジウム 11月15日（火） 国立極地研究所 2階大会議室前フロ

An observation plan of ionospheric scintillations by use of GPS signals received in Syowa Station, Antarctica – preliminary result

第2回極域科学シンポジウム/第35回極域宙空圏シンポジウム 11月16日（水） 統計数理研究所 3階リフレッシュフロ

Development of LF on board receiving system for long range propagation

第3回極域科学シンポジウム/第36回極域宙空圏シンポジウム 11月26日（月）、27日（火） 国立極地研究所 2階ラウン

Intercomparison of ionospheric observations obtained by 10C-type ionosonde and by FMCW-type ionosondes at Syowa station, Antarctica - initial results -

第2回極域科学シンポジウム/第35回極域宙空圏シンポジウム 11月15日（火） 国立極地研究所 2階大会議室前フロ

An analytic solution of steady Stokes flow on a rotating polar cap

An analytic solution of two-dimensional, steady, linear, viscous flow on a polar cap-polar region of a sphere that lies above (or below) a given plane normal to the rotation axis-rotating about its center is obtained. Inflow and outflow on the boundary of the polar cap drive the fluid motion. The solution of the stream function is expressed as the Fourier series in longitudes and the associated Legendre functions of complex degrees in cosines of colatitudes. The fluid particles move almost along lines of constant latitude, some circulate cyclonically and the others anticyclonically, in the geostrophic balance everywhere except near the north pole where the flow is relatively slow and the viscous force dominates over the Coriolis force. Our results support the approximation analysis and laboratory experiment studied by Imawaki and Takano (Deep-Sea Res. 21, 69-77, 1974)

回転球殻内のMHDシミュレーションコードの開発

A fast and accurate numerical code is developed which simulates the temporal evolution of thermal convection of an electrically conducting fluid together with induced magnetic field by solving a set of Boussinesq magneto-hydrodynamic (MHD) equations in a rotating spherical shell. This is one of the fundamental models with which the mechanisms of an MHD dynamo in a rotating spherical body such as the Earth is investigated. Spatial variations are described by the use of the spectral method which achieves high numerical accuracy; all the dependent variables are expanded in terms of spherical harmonics on spherical surfaces and Chebyshev polynomials in radial direction. The Chebyshev tau method is employed in order to satisfy boundary conditions. Temporal integration is carried out by the use of the Crank-Nicolson scheme for the viscous term and the second-order Adams-Bashforth scheme for the other terms