. . . . "http://www.isvav.cz/projectDetail.do?rowId=IAA3003205"^^ . . . "0"^^ . " Hipparcos catalogue" . . . . . "1"^^ . . " proper motions of the stars" . . "The Earth orientation parameters that we recently derived from optical astrometric measurements in the interval 1899.7 - 1992.0 in the Hipparcos reference system will be further improved, especially by using more accurate proper motions of double stars. These parameters will be combined with those now routinely observed by modern space techniques. The obtained long time series will be analyzed, in parallel with the series of meteorological, ocenographic and other geophysical data, in order to detect their mutual correlations. We shall concentrate especially on clarification of some atypical phemomena in the rotational behaviour of the Earth (such as so far not well explained large changes of Chandler component of polar motion), finding the sources of their excitation and attempts to find possible mechanisms of transfer of angular momentum between the solid Earth and its fluid parts."@en . "0"^^ . . "2007-09-26+02:00"^^ . . "optical astrometry" . . . "12"^^ . "Anal\u00FDza parametr\u016F orientace Zem\u011B ur\u010Den\u00FDch astrometrick\u00FDmi a modern\u00EDmi kosmick\u00FDmi technikami" . . "V minul\u00FDch letech n\u00E1mi ur\u010Den\u00E9 parametry orientace Zem\u011B metodami optick\u00E9 astrometrie v syst\u00E9mu katalogu Hipparcos v intervalu 1899,7 - 1999,0 budou d\u00E1le zp\u0159esn\u011Bny, zejm\u00E9na s ohledem na pou\u017Eit\u00ED p\u0159esn\u011Bj\u0161\u00EDch vlastn\u00EDch pohyb\u016F dvojhv\u011Bzd. Tyto parametry budou d\u00E1le kombinov\u00E1ny s hodnotami, z\u00EDsk\u00E1van\u00FDmi od osmdes\u00E1t\u00FDch let rutinn\u011B z pozorov\u00E1n\u00ED medern\u00EDmi kosmick\u00FDmi technikami. Takto z\u00EDskan\u00E9 dlouh\u00E9 \u010Dasov\u00E9 \u0159ady budou analyzov\u00E1ny paraleln\u011B s \u0159adami meteorologick\u00FDch, oce\u00E1nografick\u00FDch a dal\u0161\u00EDch geofyzik\u00E1ln\u00EDch pozorov\u00E1n\u00ED p\u0159esun\u016F hmot v zemsk\u00E9 atmosf\u00E9\u0159e, hydrosf\u00E9\u0159e a pl\u00E1\u0161ti za \u00FA\u010Delem zji\u0161t\u011Bn\u00ED korelac\u00ED mezi nimi. Pozornost bude v\u011Bnov\u00E1na zejm\u00E9na objasn\u011Bn\u00ED n\u011Bkter\u00FDch atypick\u00FDch jev\u016F v rota\u010Dn\u00EDm chov\u00E1n\u00ED Zem\u011B (jako nap\u0159. velk\u00FDm dosud ne zcela objasn\u011Bn\u00FDm zm\u011Bn\u00E1m Chandlerovy slo\u017Eky pohybu p\u00F3l\u016F), nalezen\u00ED zdroj\u016F excitace takov\u00FDch zm\u011Bn a pokus\u016Fm p\u0159isp\u011Bt k objasn\u011Bn\u00ED mechanizmu p\u0159enosu momentu hybnosti mezi pevnou Zem\u00ED a jej\u00EDmi tekut\u00FDmi slo\u017Ekami." . "12"^^ . "More precise star catalogue is derived and a new solution of Earth orientation parameters worked out. Scenario of excitations leading to observed changes of Chandler wobble is proposed. Free core nutation is derived and changes of its period explained."@en . " earth rotation" . "IAA3003205" . . "Je odvozen zp\u0159esn\u011Bn\u00FD hv\u011Bzdn\u00FD katalog a vypracov\u00E1no nov\u00E9 \u0159e\u0161en\u00ED parametr\u016F orientace Zem\u011B. Je navr\u017Een sc\u00E9n\u00E1\u0159 geofyzik\u00E1ln\u00EDch excitac\u00ED, vedouc\u00ED k pozorovan\u00FDm zm\u011Bn\u00E1m Chandlerova pohybu. Je odvozena voln\u00E1 nutace j\u00E1dra a vvysv\u011Btleny zm\u011Bny jej\u00ED periody."@cs . "Analysis of Earth orientation parameters measured by astrometric and modern space techniques"@en . . "optical astrometry; proper motions of the stars; Hipparcos catalogue; earth rotation; geophysical excitation"@en . .