Lamé's elastic constants determined from the results of geodetic measurements

m¶rt; n¶rt;u amu mam a u , a a ¶rt;a an¶rt;uu ¶rt; a um ¶rt;auua u a mama uu uu, un uu ¶rt; a nu¶rt; n¶rt; anu ¶rt;auua u n anu. u u¶rt;um u n¶rt;nu, m nuuum ¶rt;muma na nnuam ¶rt; uu uu nu m, u au mam uuau, u nmua u numu ¶rt; a mu ma. ¶rt; n¶rt;nam, m uu nu aum m amu mam ¶rt; (mam a u ). mm m¶rt; nu amu ¶rt;auua aua a au, a muu uu =(0,69±0,03)×10¹¹ a mmmm uua ¶rt;u a ¶rt;u m 100 ¶rt; 200 .     

Day-time ionospheric disturbances of corpuscular origin in the midlatitudeD-region

¶rt;m uu nau mu m a nu a¶rt;u ¶rt; D-amu u. a¶rt; m nu u u. u¶rt;a a a mu nma u nma mu m (20 ¶rt; 150 ).     

The pulsation activity of a geomagnetic storm

um mam aau ¶rt; a¶rt;uaum nau mu m¶rt; a aum u a ¶rt;u uma.     

Current estimates of the Earth's principal moments of inertia

Summary The principal moments of the Earth's inertia and their differences have been computed and their actual accuracy estimated on the basis of the most recent values of the 2nd degree geopotential parameters (model GEM-T2) and of the parameter H in the precession constant. The contributions due to the zero frequency zonal term in the tidal potential have been determined.

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au m nmnmuaa 2- mnu (¶rt; GEM-T2) u naama nm nuu n¶rt; aua m uuu u u u amu u ¶rt;am u a mmu. u a¶rt; n¶rt; uu nm amu a a nuu nmuaa.

     

Connection between the upper ionospheric region of VLF chorus occurrence and the plasmapause position

Summary The occurrence zone of the VLF chorus in the upper ionosphere appears at L-shells lower than plasmapause position L_pp; with increasing geomagnetic activity the spatial dimension of the zone diminishes, its upper boundary being shifted in correspondence with the plasmapause position, the lower remaining practically without change(L=2.0÷2.5). Calculations of propagation paths have shown that the similarity of the VLF chorus spectrum at different upper-ionospheric latitudes as well as the large spatial dimension of the zone of observation can be explained as special features in the propagation of VLF waves from an equatorial source, starting in the vicinity of the plasmapause with different initial normal angles.

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a umauu u ana amu L-, u L_pp (L_pp — nu nana); uu aum amumu nmam a am, nu aua am mmmuu uu nu nana, a u mam namuu u(L=2.0÷2.5). am mamu naam, m n¶rt;u nm a au uma u, ma a nmam ama a¶rt;u, m m mu anmau m amua umua, an amu nana, uu au au.

     

Resonance frequencies in the sun's motion

Summary The position of the Sun with respect to the gravity centre of the Solar System for the beginning of every year of a 3100 — year time series was determined and the harmonic analysis of the parameters of the Sun's motion about the gravity centre was carried out.

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unu u u ¶rt; ¶rt;¶rt; u ¶rt; ¶rt;u 3100 u c¶rt;uu u n ¶rt;uu u.

     

Efficient estimates of points in a net constructed in stages

auau¶rt;u mu uam nua u mau a¶rt; ¶rt;a a au. a¶rt;a n¶rt;amm mau u mau, m mumu mu, a¶rt;a u aua n mana, nuam a man uu ¶rt;unuu aua ¶rt;uam (ma mum). u m umam mamumuu ma u a nma u u n¶rt;¶rt;u man. am ma au n¶rt; na ma¶rt;am n auau.     

Luni-solar precession constant and accuracy of the Earth's principal moments of inertia

¶rt;am aum ua mm, m um aua m uuu u u amu n¶rt;u. aamuam m unau au au ma ¶rt; u nmm ¶rt; u. ¶rt;a u auu m uuu ¶rt;a, amuu u      

Gravitational potential inside 3-D inhomogeneous earth: A boundary — Value problem for the Poisson equation

Summary The problem of determining the gravitational potential inside the Earth is discussed under assumptions that the 3-D density distribution is known, that the external gravity field is described by known Stokes parameters and, finally, that the smoothed Earth surface is defined by a set of topography coefficients. The spectral method was used to separate the angular and radial parts. The solution of Poisson's equation for the internal gravitational potential was reduced to a system of ordinary differential equations with homogeneous boundary conditions and to a system of linear algebraic equations.

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¶rt;am na uuaumau nmuaa mu u n¶rt;naa, m um nmam an¶rt;u nmm, m aumau n nua umu mu naamau u, a, m au mnaua nm u a¶rt;am ¶rt; mnauu uum. a¶rt;u u a¶rt;ua am num nma m¶rt;. u au aa ¶rt; maumau nmuaa ¶rt;um u um ¶rt;uua au ¶rt;¶rt;u au uu u um u aauu au.

     

Ephemeris time,lunar orbital elements and FK4 equinox correction from the observations of the moon by the method of equal altitudes

ma n n¶rt;u u¶rt; u, m um u umuu ¶rt; amaa n nu , a¶rt;a n n a m. am nua ¶rt;a aau a¶rt;u n uumaa u ummna a ¶rt;u amuu 1965–1970 . mama u¶rt;, m na an amua ¶rt;mam ¶rt; m, m um n¶rt;um ¶rt;mam mm.     

The elastic constants of crystalline limestone computed from the velocities of body waves

m¶rt; uu nu nm u m n¶rt; , nua [4], una ¶rt; aa uma u um aumnuu. ma amuaa amu ¶rt; nm nu nm, m annuum uamuu u ¶rt;uauu ma n¶rt; . m u mu nm um ¶rt;a, nau au. ma ¶rt;a¶rt;amu nm u m n¶rt; n¶rt;um m m au.     

Periodicity in the changes of the direction of the geomagnetic field

a au ¶rt;a a¶rt;u naam, m m uu anau n m aum u m u. aam u¶rt;a nuuu u u au am nmu m au. ¶rt;m nu¶rt;umu, m m m a mu u. n¶rt;mauau auumu aama u¶rt;a u um ¶rt; um aamu.     

Effects of the IMF pro- and anti-sectors in the winter midlatitude ionosphere

Summary On the basis of the 1966–73 data, the effect of the difference between pro- and anti-sectors of the IMF is found to be negligible in the winter midlatitude (Central Europe) ionosphere contrary to the dominant effect of this difference in the high-latitude ionosphere found earlier.

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a ¶rt;a a 1966–73. u¶rt;m u m amu ¶rt; pro- u anti- mau . na a u ¶rt;um (¶rt; na) u, , a naa a, naum um u.

     

A comment on the effect of discretization on dispersion

a mamumuu m, m n¶rt; u a¶rt;a au, um ¶rt;umuau. aam, m a au ¶rt;unu a¶rt;a au n ¶rt;umuauu u n¶rt; nu a an¶rt; a u uu aa ,¶rt; h a ¶rt;umuauu.     

Supply of energy to the magnetosphere during the main phase of magnetic storms

au u¶rt;um u mu ¶rt; umu u amu, aa aum, u nuu anmuaum n mu , a ma u n¶rt;nu, m amau uu aum mu u( a a) nnua nu u nam nmama aum mu, aa naam uu . au mmuu mu u a auu ¶rt;a aaua a ¶rt;am a mum uumuu naam ¶rt;a na u ama, n¶rt; a¶rt; uu nu aua ¶rt;nuuaum n mu u. mu ¶rt; num uu, a mmmuu namu naamau , ¶rt; m¶rt; u aua nuu anmuaum n, auam mn uu, a m naama .     

Seismotectonic model of the upper part of the Earth's crust of Czechoslovakia

Summary A correlation of the earthquake occurrence on the territory of Czechoslovakia and in its close neighbourhood with the data on the neotectonic and geomorphological development of the respective area, the recent movements of the Earth's crust, the courses of photolineations and on the geophysical fields enabled the fundamental structural blocks in the upper part of the Earth's crust to be singled out. The contact zones established between the above blocks exhibit increased long-term movement tendencies particularly in the Neoid period. A seismotectonic model of the upper part of the Earth's crust of Czechoslovakia, compiled with the use of the data mentioned above, is described.

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u m uu mu a mumuu auu u mmu ¶rt;au n mmu,uu, ¶rt;uu , u nmu u uuuu n nua ¶rt;um mm u amu . a a ¶rt; muu au a¶rt;am amau ¶rt; ¶rt;uu, u¶rt; nu¶rt;. m n¶rt;aaa mmua ¶rt; amu aa a au¶rt;uauu n, nu¶rt;u a ua mumuu, u a u u n¶rt;uu au.

     

Determination of the geopotential scale factor from satellite altimetry

Summary The geopotential scale factor R ₀ =GM/W ₀ has been determined on the basis of satellite altimetry as R _{0=(6 363 672·5±0·3) m} and/or the geopotential value on the geoid W ₀ =(62 636 256·5±3) m ² s ^–2 . It has been stated that R ₀ and/or W ₀ is independent of the tidal distortion of surface W=W ₀ due to the zero frequency tide.

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¶rt;a nmu amumuu u ama amnmuaa R ₀ =GM/W ₀ =(6 363 672,5±0,3) m u/uu aunmuaa a nmuu¶rt;a W ₀ =(62 636 256,5±3) m² s^–2. m, m R ₀ u/uu W ₀ auum m nm amu a a nuu ¶rt;au nmu W=W ₀ .

     

Accuracy and reliability of magnetic parameters determined by astatic magnetometer

Summary Innovation of astatic magnetometers requires improvement of measuring and computation procedures taking advantage of existing computer technology. A statistical model is proposed which is based on relations between the magnetic properties of measured samples and values of the field measured by a magnetometer. The paper focuses on the accuracy and confidence intervals for the parameters derived.

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u amamuu a¶rt;umm mm mau uum u uum n¶rt; unau m nm m¶rt;uu. ¶rt;a¶rt;am mamumua ¶rt;, ma aa a ¶rt; a¶rt;umuuu naamau u a u auu n, uu a¶rt;umm. mam ¶rt;m ¶rt;a uau mmu u ¶rt;uanaa a¶rt;mu nu¶rt; naam.

     

Optimum determination of Euler Angles

a m m n¶rt; uua ¶rt; au anauu a nmu n¶rt;nuu, m u ¶rt;a a ¶rt;u -um, ma u amu um ¶rt;uam. a namu unm ¶rt;a anau, nu a¶rt;u m m aua n-a. nuam n¶rt; n¶rt;u au — D-nmuamu — naa uu anau ¶rt; n¶rt;u a.     

Bicubic spline smoothing of the data given at points of a rectangular network

Summary A computational method for fitting smoothed natural or periodic bicubic splines to data given at the grid points of a rectangular network is proposed. The one-dimensional smoothed spline fit, introduced by Reinsch, defines the smoothness properties well. These are generalized for a two-dimensional approximation by solving the corresponding variational problem. The defining equations are presented here together with an efficient method of determining the necessary parameters and computing the resultant spline.

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¶rt;u u m¶rt; annuauu ¶rt; uu auauu nau m m¶rt; a [12]. am am nua m¶rt; au m¶rt; a ¶rt; u ¶rt; n. nua aum n¶rt;aa ¶rt; annuauu ¶rt; uu, a¶rt;a uu auu a nu n mu, mmu uuuu naau uu ( m auam) uuuu naau, nu¶rt;uuu ¶rt; anauu. mam um uma uum, n m aum annuu u . namuu uu a omaa naa a FORTRAN.