Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W1978653020', 'doi': 'https://doi.org/10.1002/cjg2.597', 'title': 'Spherical Cap Harmonic Analysis of the Geomagnetic Field in the Beijing‐Tianjin‐Hebei Region', 'display_name': 'Spherical Cap Harmonic Analysis of the Geomagnetic Field in the Beijing‐Tianjin‐Hebei Region', 'publication_year': 2004, 'publication_date': '2004-11-01', 'ids': {'openalex': 'https://openalex.org/W1978653020', 'doi': 'https://doi.org/10.1002/cjg2.597', 'mag': '1978653020'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1002/cjg2.597', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S2764368349', 'display_name': 'Chinese Journal of Geophysics', 'issn_l': '0898-9591', 'issn': ['0898-9591', '2326-0440'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320595', 'host_organization_name': 'Wiley', 'host_organization_lineage': ['https://openalex.org/P4310320595'], 'host_organization_lineage_names': ['Wiley'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref'], 'open_access': {'is_oa': False, 'oa_status': 'closed', 'oa_url': None, 'any_repository_has_fulltext': False}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5100950728', 'display_name': 'Zuowen Gu', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I90149893', 'display_name': 'China Earthquake Administration', 'ror': 'https://ror.org/045sza929', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I90149893']}], 'countries': ['CN'], 'is_corresponding': False, 'raw_author_name': 'Zuo-Wen Gu', 'raw_affiliation_strings': ['Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,'], 'affiliations': [{'raw_affiliation_string': 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,', 'institution_ids': ['https://openalex.org/I90149893']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5024893943', 'display_name': 'Zhenchang An', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I19820366', 'display_name': 'Chinese Academy of Sciences', 'ror': 'https://ror.org/034t30j35', 'country_code': 'CN', 'type': 'government', 'lineage': ['https://openalex.org/I19820366']}, {'id': 'https://openalex.org/I90149893', 'display_name': 'China Earthquake Administration', 'ror': 'https://ror.org/045sza929', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I90149893']}, {'id': 'https://openalex.org/I4210126061', 'display_name': 'Institute of Geology and Geophysics', 'ror': 'https://ror.org/030vmwa78', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I19820366', 'https://openalex.org/I4210126061']}], 'countries': ['CN'], 'is_corresponding': False, 'raw_author_name': 'Zhen-Chang An', 'raw_affiliation_strings': ['Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China', 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China'], 'affiliations': [{'raw_affiliation_string': 'Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China', 'institution_ids': ['https://openalex.org/I19820366', 'https://openalex.org/I4210126061']}, {'raw_affiliation_string': 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China', 'institution_ids': ['https://openalex.org/I90149893']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5049361757', 'display_name': 'Jin-Tian Guao', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I90149893', 'display_name': 'China Earthquake Administration', 'ror': 'https://ror.org/045sza929', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I90149893']}], 'countries': ['CN'], 'is_corresponding': False, 'raw_author_name': 'Jin-Tian Guao', 'raw_affiliation_strings': ['Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,'], 'affiliations': [{'raw_affiliation_string': 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,', 'institution_ids': ['https://openalex.org/I90149893']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5112108238', 'display_name': 'Wei Han', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I90149893', 'display_name': 'China Earthquake Administration', 'ror': 'https://ror.org/045sza929', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I90149893']}], 'countries': ['CN'], 'is_corresponding': False, 'raw_author_name': 'Wei Han', 'raw_affiliation_strings': ['Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,'], 'affiliations': [{'raw_affiliation_string': 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,', 'institution_ids': ['https://openalex.org/I90149893']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5102259537', 'display_name': 'Zhijia Zhan', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I90149893', 'display_name': 'China Earthquake Administration', 'ror': 'https://ror.org/045sza929', 'country_code': 'CN', 'type': 'facility', 'lineage': ['https://openalex.org/I90149893']}], 'countries': ['CN'], 'is_corresponding': False, 'raw_author_name': 'Zhi-Jia Zhan', 'raw_affiliation_strings': ['Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,'], 'affiliations': [{'raw_affiliation_string': 'Institute of Geophysics, China Earthquake Administration, Beijing 100081, China,', 'institution_ids': ['https://openalex.org/I90149893']}]}], 'institution_assertions': [], 'countries_distinct_count': 1, 'institutions_distinct_count': 3, 'corresponding_author_ids': [], 'corresponding_institution_ids': [], 'apc_list': None, 'apc_paid': None, 'fwci': 0.594, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 16, 'citation_normalized_percentile': {'value': 0.582501, 'is_in_top_1_percent': False, 'is_in_top_10_percent': False}, 'cited_by_percentile_year': {'min': 84, 'max': 85}, 'biblio': {'volume': '47', 'issue': '6', 'first_page': '1128', 'last_page': '1134'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T11786', 'display_name': 'Geomagnetism and Paleomagnetism Studies', 'score': 0.9995, 'subfield': {'id': 'https://openalex.org/subfields/1312', 'display_name': 'Molecular Biology'}, 'field': {'id': 'https://openalex.org/fields/13', 'display_name': 'Biochemistry, Genetics and Molecular Biology'}, 'domain': {'id': 'https://openalex.org/domains/1', 'display_name': 'Life Sciences'}}, 'topics': [{'id': 'https://openalex.org/T11786', 'display_name': 'Geomagnetism and Paleomagnetism Studies', 'score': 0.9995, 'subfield': {'id': 'https://openalex.org/subfields/1312', 'display_name': 'Molecular Biology'}, 'field': {'id': 'https://openalex.org/fields/13', 'display_name': 'Biochemistry, Genetics and Molecular Biology'}, 'domain': {'id': 'https://openalex.org/domains/1', 'display_name': 'Life Sciences'}}, {'id': 'https://openalex.org/T10572', 'display_name': 'Geophysical and Geoelectrical Methods', 'score': 0.9963, 'subfield': {'id': 'https://openalex.org/subfields/1908', 'display_name': 'Geophysics'}, 'field': {'id': 'https://openalex.org/fields/19', 'display_name': 'Earth and Planetary Sciences'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T12424', 'display_name': 'Earthquake Detection and Analysis', 'score': 0.9944, 'subfield': {'id': 'https://openalex.org/subfields/1908', 'display_name': 'Geophysics'}, 'field': {'id': 'https://openalex.org/fields/19', 'display_name': 'Earth and Planetary Sciences'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/spherical-cap', 'display_name': 'Spherical cap', 'score': 0.79205066}, {'id': 'https://openalex.org/keywords/truncation', 'display_name': 'Truncation (statistics)', 'score': 0.45549923}, {'id': 'https://openalex.org/keywords/intensity', 'display_name': 'Intensity', 'score': 0.4260203}], 'concepts': [{'id': 'https://openalex.org/C199635899', 'wikidata': 'https://www.wikidata.org/wiki/Q6500960', 'display_name': "Earth's magnetic field", 'level': 3, 'score': 0.9154043}, {'id': 'https://openalex.org/C2778664614', 'wikidata': 'https://www.wikidata.org/wiki/Q575597', 'display_name': 'Spherical cap', 'level': 2, 'score': 0.79205066}, {'id': 'https://openalex.org/C3768446', 'wikidata': 'https://www.wikidata.org/wiki/Q877100', 'display_name': 'Spherical harmonics', 'level': 2, 'score': 0.69533336}, {'id': 'https://openalex.org/C124200008', 'wikidata': 'https://www.wikidata.org/wiki/Q76287', 'display_name': 'Declination', 'level': 2, 'score': 0.6494762}, {'id': 'https://openalex.org/C2778304055', 'wikidata': 'https://www.wikidata.org/wiki/Q657474', 'display_name': 'Beijing', 'level': 3, 'score': 0.6002897}, {'id': 'https://openalex.org/C13280743', 'wikidata': 'https://www.wikidata.org/wiki/Q131089', 'display_name': 'Geodesy', 'level': 1, 'score': 0.4610495}, {'id': 'https://openalex.org/C106195933', 'wikidata': 'https://www.wikidata.org/wiki/Q7847935', 'display_name': 'Truncation (statistics)', 'level': 2, 'score': 0.45549923}, {'id': 'https://openalex.org/C93038891', 'wikidata': 'https://www.wikidata.org/wiki/Q1061524', 'display_name': 'Intensity (physics)', 'level': 2, 'score': 0.4260203}, {'id': 'https://openalex.org/C9652623', 'wikidata': 'https://www.wikidata.org/wiki/Q190109', 'display_name': 'Field (mathematics)', 'level': 2, 'score': 0.41799957}, {'id': 'https://openalex.org/C8058405', 'wikidata': 'https://www.wikidata.org/wiki/Q46255', 'display_name': 'Geophysics', 'level': 1, 'score': 0.3773892}, {'id': 'https://openalex.org/C121332964', 'wikidata': 'https://www.wikidata.org/wiki/Q413', 'display_name': 'Physics', 'level': 0, 'score': 0.37053475}, {'id': 'https://openalex.org/C115260700', 'wikidata': 'https://www.wikidata.org/wiki/Q11408', 'display_name': 'Magnetic field', 'level': 2, 'score': 0.3449221}, {'id': 'https://openalex.org/C127313418', 'wikidata': 'https://www.wikidata.org/wiki/Q1069', 'display_name': 'Geology', 'level': 0, 'score': 0.32967806}, {'id': 'https://openalex.org/C2524010', 'wikidata': 'https://www.wikidata.org/wiki/Q8087', 'display_name': 'Geometry', 'level': 1, 'score': 0.19184259}, {'id': 'https://openalex.org/C33923547', 'wikidata': 'https://www.wikidata.org/wiki/Q395', 'display_name': 'Mathematics', 'level': 0, 'score': 0.17889687}, {'id': 'https://openalex.org/C205649164', 'wikidata': 'https://www.wikidata.org/wiki/Q1071', 'display_name': 'Geography', 'level': 0, 'score': 0.15612552}, {'id': 'https://openalex.org/C44870925', 'wikidata': 'https://www.wikidata.org/wiki/Q37547', 'display_name': 'Astrophysics', 'level': 1, 'score': 0.080525845}, {'id': 'https://openalex.org/C191935318', 'wikidata': 'https://www.wikidata.org/wiki/Q148', 'display_name': 'China', 'level': 2, 'score': 0.066973686}, {'id': 'https://openalex.org/C120665830', 'wikidata': 'https://www.wikidata.org/wiki/Q14620', 'display_name': 'Optics', 'level': 1, 'score': 0.06633386}, {'id': 'https://openalex.org/C105795698', 'wikidata': 'https://www.wikidata.org/wiki/Q12483', 'display_name': 'Statistics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C166957645', 'wikidata': 'https://www.wikidata.org/wiki/Q23498', 'display_name': 'Archaeology', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C62520636', 'wikidata': 'https://www.wikidata.org/wiki/Q944', 'display_name': 'Quantum mechanics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C202444582', 'wikidata': 'https://www.wikidata.org/wiki/Q837863', 'display_name': 'Pure mathematics', 'level': 1, 'score': 0.0}], 'mesh': [], 'locations_count': 1, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1002/cjg2.597', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S2764368349', 'display_name': 'Chinese Journal of Geophysics', 'issn_l': '0898-9591', 'issn': ['0898-9591', '2326-0440'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310320595', 'host_organization_name': 'Wiley', 'host_organization_lineage': ['https://openalex.org/P4310320595'], 'host_organization_lineage_names': ['Wiley'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': None, 'sustainable_development_goals': [], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 7, 'referenced_works': ['https://openalex.org/W2024917405', 'https://openalex.org/W2028594890', 'https://openalex.org/W2047338851', 'https://openalex.org/W2050422325', 'https://openalex.org/W2089887275', 'https://openalex.org/W2353587617', 'https://openalex.org/W2363996378'], 'related_works': ['https://openalex.org/W745592000', 'https://openalex.org/W4230658211', 'https://openalex.org/W2978352111', 'https://openalex.org/W2803190316', 'https://openalex.org/W2760346936', 'https://openalex.org/W2367991251', 'https://openalex.org/W2088270676', 'https://openalex.org/W2009311329', 'https://openalex.org/W1997324282', 'https://openalex.org/W1008188974'], 'abstract_inverted_index': {'Abstract': [0], 'Three‐component': [1], 'absolute': [2], 'surveys': [3], 'of': [4, 80, 92, 104, 117, 129], 'the': [5, 16, 60, 67, 74, 85, 93, 105, 112, 114, 118, 130, 132, 139, 146, 194], 'geomagnetic': [6, 68, 81, 155, 178], 'field': [7, 13, 70, 83, 157], 'were': [8, 24], 'carried': [9], 'out': [10], 'at': [11, 97], '45': [12], 'sites': [14], 'in': [15, 19, 71, 84, 145, 193], 'Beijing‐Tianjin‐Hebei': [17, 86, 147, 195], 'region': [18, 87, 148, 196], '2002.': [20, 35], 'The': [21, 26, 36, 90], 'survey': [22], 'data': [23], 'reduced.': [25], 'reduce': [27], 'time': [28], 'was': [29], '16:00‐18:00': [30], '(UT)': [31], 'on': [32], 'May': [33], '5,': [34], 'RMS': [37], 'values': [38], 'after': [39], 'reducing': [40], 'are': [41, 197], 'respectively': [42], 'better': [43], 'than': [44], '1.5nT': [45], '(for': [46, 52], 'total': [47], 'intensity': [48], 'F)': [49], 'and': [50, 55, 99, 101, 138, 177], "0.5'": [51], 'declination': [53], 'D': [54, 172, 189], 'inclination': [56], 'I': [57, 175, 191], ').': [58], 'Taking': [59], 'International': [61], 'Geomagnetic': [62], 'Reference': [63], 'Field': [64], '(IGRF2000)': [65], 'as': [66], 'normal': [69], 'this': [72, 153], 'region,': [73], 'spherical': [75, 94, 106, 119, 140], 'cap': [76, 95, 107, 120, 141], 'harmonic': [77, 121, 142], 'model': [78, 143], '(BTHASCH)': [79], 'anomalous': [82, 156], 'is': [88, 96, 108, 123, 136, 149], 'calculated.': [89], 'pole': [91], '39.5°N': [98], '117.0°E': [100], 'its': [102], 'half‐angle': [103], '4°.': [109], 'During': [110], 'calculating': [111], 'model,': [113, 154], 'truncation': [115, 134], 'order': [116, 135], 'function': [122], '1‐10.': [124], 'According': [125, 151], 'to': [126, 152], 'comprehensive': [127], 'comparison': [128], 'results,': [131], 'final': [133], '5': [137], '(BTHGRF)': [144], 'established.': [150], 'charts': [158, 179], '(Δ': [159], 'X': [160, 181], ',': [161, 164, 167, 170, 173, 182, 184, 186, 188, 190], 'Δ': [162, 165, 168, 171, 174], 'Y': [163, 183], 'Z': [166, 185], 'F': [169, 187], ')': [176, 192], '(': [180], 'drawn.': [198]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W1978653020', 'counts_by_year': [{'year': 2022, 'cited_by_count': 1}, {'year': 2016, 'cited_by_count': 1}, {'year': 2015, 'cited_by_count': 2}, {'year': 2014, 'cited_by_count': 2}], 'updated_date': '2024-12-08T11:37:18.432056', 'created_date': '2016-06-24'}