{"_buckets": {"deposit": "41dc08b7-3e6a-4467-b413-58ba14ba5051"}, "_deposit": {"id": "34034", "owner": "1", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "34034"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00034034", "sets": []}, "author_link": ["132675", "132674"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\u5730\u7403\u6838\u5185\u306e\u96fb\u78c1\u6d41\u4f53\u632f\u52d5"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1955-06-25", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "25", "bibliographicPageStart": "1", "bibliographicVolumeNumber": "33", "bibliographic_titles": [{"bibliographic_title": "\u6771\u4eac\u5927\u5b78\u5730\u9707\u7814\u7a76\u6240\u5f59\u5831 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]}, "item_4_description_13": {"attribute_name": "\u30d5\u30a9\u30fc\u30de\u30c3\u30c8", "attribute_value_mlt": [{"subitem_description": "application/pdf", "subitem_description_type": "Other"}]}, "item_4_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Possibilities of magneto-hydrodynamic oscillations in the earth\u0027s core are discussed in relation to the stability of Elsasser-Bullard-Takeuchi\u0027s dynamo. If there are stable magnetic fields which are caused by the dynamo-action in the earth\u0027s core, there will be oscillations of magnetic field and fluid motion around the steady state. This sort of oscillation is here studied under some simplifications. Although the study is rather crude, it is tentatively concluded that the toroidal magnetic field is not so large, otherwise the small oscillations of dynamo would not be stable. Since the fundamental equations for magnetic changes in the earth\u0027s core are obtained, we may forecast the magnitude of magnetic field of certain type, say S10-type, starting from suitable initial conditions. This is done in this paper on the basis of the spherical harmonic analyses for various epochs. Although no definite result is obtained because the observation period of the earth\u0027s magnetism seems too short for close comparison between the observation and theory, the conclusion concerning the internal magnetic field is compatible with that obtained in the stability problem. The effect of the earth\u0027s rotation as well as that of the mutual dependence of various spherical harmonics are ignored throughout this study. That sort of study will be carried out later on.", "subitem_description_type": "Abstract"}, {"subitem_description": "Elsasser, Bullard,\u7af9\u5185\u7b49\u306b\u3088\u3064\u3066\u7814\u7a76\u3055\u308c\u305f\u3088\u3046\u306b,\u5730\u7403\u6838\u5185\u306e\u30c0\u30a4\u30ca\u30e2\u4f5c\u7528\u306f,\u73fe\u5728\u8003\u3048\u5f97\u3089\u308c\u308b\u5730\u78c1\u6c17\u539f\u56e0\u3068\u3057\u3066\u3082\u3064\u3068\u3082\u6709\u529b\u3067\u3042\u308b.\u5730\u7403\u4e3b\u78c1\u5834\u304c\u30c0\u30a4\u30ca\u30e2\u4f5c\u7528\u306b\u3088\u3064\u3066\u7dad\u6301\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u4e8b\u5b9f\u306f,\u6570\u5b66\u7684\u8868\u73fe\u3092\u7528\u3044\u308b\u6642\u306b\u306f,\u6838\u5185\u306b\u65bc\u3066\u96fb\u78c1\u5834\u304a\u3088\u3073\u6d41\u4f53\u306e\u57fa\u790e\u65b9\u7a0b\u5f0f\u304c\u5b9a\u5e38\u306a\u89e3\u3092\u6709\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u306b\u5bfe\u5fdc\u3059\u308b.\u3053\u306e\u5b9a\u5e38\u89e3\u306e\u5b58\u5728\u306f\u9ad8\u6b21\u306e\u6d41\u4f53\u904b\u52d5\u304a\u3088\u3073\u96fb\u78c1\u5834\u3092\u7701\u7565\u3059\u308b\u9650\u308a\u78ba\u7acb\u3055\u308c\u305f.", "subitem_description_type": "Abstract"}]}, "item_4_full_name_3": {"attribute_name": "\u8457\u8005\u5225\u540d", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "132675", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "\u529b\u6b66, \u5e38\u6b21"}]}]}, "item_4_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.15083/0000034034", "subitem_identifier_reg_type": "JaLC"}]}, "item_4_publisher_20": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u6771\u4eac\u5927\u5b66\u5730\u9707\u7814\u7a76\u6240"}]}, "item_4_source_id_10": {"attribute_name": "\u66f8\u8a8c\u30ec\u30b3\u30fc\u30c9ID", "attribute_value_mlt": [{"subitem_source_identifier": "AN00162258", "subitem_source_identifier_type": "NCID"}]}, "item_4_source_id_8": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "00408972", "subitem_source_identifier_type": "ISSN"}]}, "item_4_subject_15": {"attribute_name": "\u65e5\u672c\u5341\u9032\u5206\u985e\u6cd5", "attribute_value_mlt": [{"subitem_subject": "453", "subitem_subject_scheme": "NDC"}]}, "item_4_text_21": {"attribute_name": "\u51fa\u7248\u8005\u5225\u540d", "attribute_value_mlt": [{"subitem_text_value": "Earthquake Research Institute, University of Tokyo"}]}, "item_4_text_34": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"subitem_text_value": "Departmental Bulletin Paper"}]}, "item_4_text_4": {"attribute_name": "\u8457\u8005\u6240\u5c5e", "attribute_value_mlt": [{"subitem_text_value": "Earthquake Research Institute"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Rikitake, Tsuneji"}], "nameIdentifiers": [{"nameIdentifier": "132674", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2017-06-27"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "ji0331001.pdf", "filesize": [{"value": "1.2 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 1200000.0, "url": {"label": "ji0331001.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/34034/files/ji0331001.pdf"}, "version_id": "e45868c8-c206-498e-982d-286836acb892"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Magneto-hydrodynamic Oscillations in the Earth\u0027s Core", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Magneto-hydrodynamic Oscillations in the Earth\u0027s Core", "subitem_title_language": "en"}]}, "item_type_id": "4", "owner": "1", "path": ["80/4535/5047/5055", "9/504/4538/5049/5056"], "permalink_uri": "https://doi.org/10.15083/0000034034", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2008-05-30"}, "publish_date": "2008-05-30", "publish_status": "0", "recid": "34034", "relation": {}, "relation_version_is_last": true, "title": ["Magneto-hydrodynamic Oscillations in the Earth\u0027s Core"], "weko_shared_id": -1}