"GP205/08/P229" . "geomagnetic induction; satellite geomagnetic observations; electrical conductivity; lower mantle; D%22"@en . . . "Electrical conductivity of lower mantle"@en . . . . . . "Elektrick\u00E1 vodivost spodn\u00EDho pl\u00E1\u0161t\u011B" . . "http://www.isvav.cz/projectDetail.do?rowId=GP205/08/P229"^^ . "Inverz\u00ED geomagnetick\u00FDch dat ze satelitu CHAMP byl z\u00EDsk\u00E1n hloubkov\u00FD vodivostn\u00ED profil v pl\u00E1\u0161ti, ve kter\u00E9m byl pozorov\u00E1n jednak m\u00EDrn\u00FD pokles vodivosti v hloubk\u00E1ch 1000-1500 km, a d\u00E1le absence n\u00E1r\u016Fstu vodivosti v D\\%22. Prvn\u00ED v\u00FDsledek lze p\u0159edb\u011B\u017En\u011B interpretovat jako vliv spinov\u00E9ho p\u0159echodu v pl\u00E1\u0161ti. Druh\u00FD v\u00FDsledek implikuje absenci homogenn\u00ED, n\u011Bkolik stovek kilometr\u016F siln\u00E9 vrstvy post-perovskitu v D\\"@cs . "2015-03-20+01:00"^^ . . "Projekt spo\u010D\u00EDv\u00E1 v kombinovan\u00E9m pou\u017Eit\u00ED t\u0159\u00ED geomagnetick\u00FDch metod ke studiu elektrick\u00E9 vodivosti spodn\u00EDho pl\u00E1\u0161t\u011B: 1. Dlouhoperiodick\u00E1 EM indukce excitovan\u00E1 vn\u011Bj\u0161\u00EDmi proudy. Nov\u00E1 metoda modelov\u00E1n\u00ED v \u010Dasov\u00E9 oblasti bude aplikov\u00E1na na m\u011Bs\u00ED\u010Dn\u00ED pr\u016Fm\u011Bry geomag.pole z pozemn\u00EDch stanic a satelit\u016F. Budu studovat citlivost t\u011Bchto dat na radi\u00E1ln\u00ED i later\u00E1ln\u00ED rozlo\u017Een\u00ED vodivosti ve spodn\u00EDm pl\u00E1\u0161ti. 2. Prodlu\u017Eov\u00E1n\u00ED geomagnetick\u00E9ho pole generovan\u00E9ho geodynamem a jeho n\u00E1hl\u00FDch zm\u011Bn - jerk\u016F vodiv\u00FDm pl\u00E1\u0161t\u011Bm na povrch. Buduse zab\u00FDvat formulac\u00ED p\u0159\u00EDm\u00E9 \u00FAlohy EM indukce s kombinovan\u00FDmi pod- (CMB) a p\u0159eur\u010Den\u00FDmi (povrch) okrajov\u00FDmi podm\u00EDnkami a studovat vliv vodivosti ve spodn\u00EDm pl\u00E1\u0161ti na prodlu\u017Eov\u00E1n\u00ED pole. 3. EM interakce pl\u00E1\u0161t\u011B a j\u00E1dra. Interpretace nam\u011B\u0159en\u00FDch zm\u011Bn rychlosti zemsk\u00E9 rotace pomoc\u00ED momentu Lorentzovy s\u00EDly je dal\u0161\u00EDm omezen\u00EDm na vodivostn\u00ED modely.V\u0161echny t\u0159i p\u0159\u00EDstupy pl\u00E1nuji spojit do spole\u010Dn\u00E9 obr\u00E1cen\u00E9 \u00FAlohy. V\u00FDsledn\u00E9 vodivostn\u00ED modely spodn\u00EDho pl\u00E1\u0161t\u011B budu srovn\u00E1vat ve spolupr\u00E1ci s kolegy na KG MFF UK s ostatn\u00EDmi" . . . . " lower mantle" . "2008-01-01+01:00"^^ . "2010-04-16+02:00"^^ . "0"^^ . "Inversion of geomagnetic data from the CHAMP satellite provided a 1-D conductivity profile in the Earth\\'s mantle which features a slight decrease of conductivity at the depth range of 1000-1500 km, and a lack of steep conductivity increase in the D\\%22 layer. The first result leads to a preliminary interpretation by the effect of spin transition occuring in iron atoms in perovskite and ferropericl"@en . " satellite geomagnetic observations" . " electrical conductivity" . . "2"^^ . "0"^^ . "2"^^ . "1"^^ . "The project consists of combined use of three geomagnetic methods to study the electrical conductivity of the lower mantle: 1. Long-period EM induction excited by external currents. Time-domain modelling will be applied to monthly means obtained from geomag. observatory and satellite data. I will study the sensititivy to radial and lateral distribution of conudctivity in the lower mantle. 2. Upward continuation of geomag. field generated by the geodynamo and of its abrupt changes (jerks) through conductive mantle. I will address the formulation of the forward EM induction problem with under- (CMB) and over-determined (surface) boundary conditions and study the effect of lower mantle conductivity on the field continuation. 3. EM core-mantle coupling. Interpretation of observed changes in length of day by the EM torque will be used as an additional constraint on conductivity models. I intent to combine the three approaches into one inverse formulation. Resulting conductivity models will be"@en . "2010-12-31+01:00"^^ . . . . . . . "geomagnetic induction" .