Normal density earth models

Резюме

Выве¶rt;ены мо¶rt;елu рaсnре¶rt;еленuя nлоmносmu блuзкuе мо¶rt;елuPREM (m. нaз. нормaльные мо¶rt;елu nлоmносmu), внещнеегрaвumaцuонное nоле коmорых u¶rt;енmuчно совna¶rt;aеm с нормaльнымuгрaвumaцuонным nолем Землu. Поверхносmв Землu annроксuмuруеmся в рaбоmе эллunсоu¶rt;ом врaщенuя. Дuнaмuческое сжamuе нормaльныь мо¶rt;елеŭ сосmaвляеm H==0.003 273 994. Из множесmвa выве¶rt;енных нормaльных мо¶rt;елеŭ рекомен¶rt;уеmся мо¶rt;ельHME2. В кaчесmве anрuорноŭ оценкu нормaльных мо¶rt;елеŭ nлоmносmu былa uслnользовaнa сре¶rt;няя рa¶rt;uaльно сuммеmрuческaя мо¶rt;ельPREM. Пре¶rt;лaгaеmця мо¶rt;uфuкaцuя эmоŭ мо¶rt;елu nо¶rt; нaзвaнuемPREM-E2.

Summary

Models of the Earth's density, close to thePREM model, have been derived, they reproduce the external normal gravitational field of the Earth and its dynamic flattening, and are referred to as normal density models. The Earth's surface is approximated by an ellipsoid of the order of the flattening, or of its square. Of the group of normal models sgtisfying the solution of the inverse problem, the normal density modelHME2 is recommended. The spherically symmetric density modelPREM, which was corrected in the course of solving the inverse problem, thus creating the modifiedPREM-E2 model, was used as the a priori information.