| Geomagnetic aa Indices | identificationInfo|
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| (MI_Metadata) fileIdentifier: gov.noaa.ngdc.stp.indices:G00020 language: eng; USA characterSet: (MD_CharacterSetCode) utf8 hierarchyLevel: (MD_ScopeCode) dataset contact: (CI_ResponsibleParty) individualName: Justin Mabie organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce positionName: Space and Terrestrial Weather Specialist contactInfo: (CI_Contact) phone: (CI_Telephone) voice: (303) 497-6135 facsimile: (303) 497-6513 address: (CI_Address) deliveryPoint: 325 Broadway, Mail Code E/GC4 city: Boulder administrativeArea: CO postalCode: 80305-3328 country: USA electronicMailAddress: Justin.Mabie@noaa.gov role: (CI_RoleCode) pointOfContact dateStamp: 2015-09-18 metadataStandardName: ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data metadataStandardVersion: ISO 19115-2:2009(E) return to top identificationInfo: (MD_DataIdentification) citation: (CI_Citation) title: Geomagnetic aa Indices date: (CI_Date) date: 1957-01-01 dateType: (CI_DateTypeCode) publication edition: First citedResponsibleParty: (CI_ResponsibleParty) organisationName: NOAA National Centers for Environmental Information role: (CI_RoleCode) publisher citedResponsibleParty: (CI_ResponsibleParty) organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce role: (CI_RoleCode) publisher citedResponsibleParty: (CI_ResponsibleParty) organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce role: (CI_RoleCode) originator series: (CI_Series) name: Solar-Terrestrial Physics (STP) issueIdentification: 'Working Document II' abstract: The geomagnetic aa indices are the continuation of the series beginning in the year 1868. A full description of these indices is given in the International Association of Geomagnetism and Aeronomy (IAGA) Bulletin No 33, which contains them for the years 1868-1967. Descriptions are also given (especially comparisons with am, ap, or Ci indices) in two short papers [Ann. Geoph., 27, 62-70, 1971 and J. Geophys. Res., 77, 6870-6874, 1972]. The aa values form 1968-1975 are contained in the IAGA Bulletin 39. From 1976 onward they are included in IAGA Bulletin 32. Revised aa values for the years 1969-1976 have been distributed in 1979 to the recipients of IAGA Bulletin 32 in the form of loose sheets to be inserted in the Bulletin 39 (1968-1975) and 32f (1976). A graph of these values 1868 - 1979 is published in the 426 Part I issue of Solar-Geophysical Data (SGD) (page 137). Revised aa values for 1968-1977 appear in the 411 Part II February 1977 SGD. Briefly, such three-hourly indices as these, computed from K indices of two antipodal observatories (invariant magnetic latitude 50 degrees), provide a quantitative characterization of the magnetic activity, which is homogeneous through the whole series. Half-daily and daily values give an estimation of the activity level very close to that obtained with "am" indices. Values are in gammas and correspond to the activity level at an invariant magnetic latitude of 50 degrees. The aa indices are computed for: N = daily values for the Northern Hemisphere, S = daily values for the Southern Hemisphere, M = half-daily values of aa indices for the Greenwich day. Letters C and K refer to a classification of the quiet days of the month (C = really quiet, K = quiet but with slightly disturbed three-hourly intervals). The letters on the left refer to the 24-hour Greenwich day, on the right to a period of 48 hours centered on the Greenwich noon. The three-hourly indices aa are available from the appropriate World Data Centers in digital form using the format described in IAGA Bulletin 33. purpose: Solar Wind/Magnetospheric Research status: (MD_ProgressCode) completed pointOfContact: (CI_ResponsibleParty) individualName: Justin Mabie organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce positionName: Space and Terrestrial Weather Specialist contactInfo: (CI_Contact) phone: (CI_Telephone) voice: (303) 497-6135 facsimile: (303) 497-6513 address: (CI_Address) deliveryPoint: 325 Broadway, Mail Code E/GC4 city: Boulder administrativeArea: CO postalCode: 80305-3328 country: USA electronicMailAddress: Justin.Mabie@noaa.gov role: (CI_RoleCode) pointOfContact resourceMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) NOT UPDATED descriptiveKeywords: (MD_Keywords) keyword: Earth Science > Interior & Crust keyword: EARTH SCIENCE > SOLID EARTH > Geomagnetism > Geomagnetic Indices type: (MD_KeywordTypeCode) theme thesaurusName: (CI_Citation) title: NASA/GCMD Earth Science Keywords date: (unknown) descriptiveKeywords: (MD_Keywords) keyword: Solar Physics keyword: Space Physics keyword: Geomagnetism keyword: Indices type: (MD_KeywordTypeCode) theme thesaurusName: (CI_Citation) title: Uncontrolled Keywords date: (unknown) descriptiveKeywords: (MD_Keywords) keyword: Global type: (MD_KeywordTypeCode) place thesaurusName: (CI_Citation) title: NASA/GCMD Location Keywords date: (unknown) descriptiveKeywords: (MD_Keywords) keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce keyword: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce type: (MD_KeywordTypeCode) dataCentre thesaurusName: (CI_Citation) title: Global Change Master Directory (GCMD) Data Center Keywords date: (CI_Date) date: 2020-01-09 dateType: (CI_DateTypeCode) publication edition: 9.1 citedResponsibleParty: (CI_ResponsibleParty) organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords name: Global Change Master Directory (GCMD) Keywords description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian resourceConstraints: (MD_Constraints) useLimitation: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. resourceConstraints: (MD_LegalConstraints) useConstraints: (MD_RestrictionCode) otherRestrictions otherConstraints: Use Constraints: None resourceConstraints: (MD_LegalConstraints) accessConstraints: (MD_RestrictionCode) otherRestrictions otherConstraints: Access Constraints: No Constraints language: eng; USA topicCategory: (MD_TopicCategoryCode) geoscientificInformation extent: (EX_Extent) geographicElement: (EX_GeographicBoundingBox) westBoundLongitude: -180.000000 eastBoundLongitude: 180.000000 southBoundLatitude: -90.000000 northBoundLatitude: 90.000000 temporalElement: (EX_TemporalExtent) extent: TimePeriod: beginPosition: 1868-01-01 endPosition: supplementalInformation: Observing station type: Geophysical Observatory. Number of sites: 12. European Space Operations Center, German Federal Republic. return to top distributionInfo: (MD_Distribution) distributionFormat: (MD_Format) name: ASCII version: (unknown) distributor: (MD_Distributor) distributorContact: (CI_ResponsibleParty) individualName: Justin Mabie organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce positionName: Space and Terrestrial Weather Specialist contactInfo: (CI_Contact) phone: (CI_Telephone) voice: (303) 497-6135 facsimile: (303) 497-6513 address: (CI_Address) deliveryPoint: 325 Broadway, Mail Code E/GC4 city: Boulder administrativeArea: CO postalCode: 80305-3328 country: USA electronicMailAddress: Justin.Mabie@noaa.gov role: (CI_RoleCode) pointOfContact distributionOrderProcess: (MD_StandardOrderProcess) fees: Depends on the Data Set orderingInstructions: Ordering Instructions: Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information turnaround: 4 Days transferOptions: (MD_DigitalTransferOptions) transferSize: Real: 34.600000 onLine: (CI_OnlineResource) linkage: ftp://ftp.ngdc.noaa.gov/STP/GEOMAGNETIC_DATA/ transferOptions: (MD_DigitalTransferOptions) offLine: (MD_Medium) name: (MD_MediumNameCode) cdRom mediumFormat: (MD_MediumFormatCode) iso9660 return to top dataQualityInfo: (DQ_DataQuality) scope: (DQ_Scope) level: (MD_ScopeCode) repository levelDescription: (MD_ScopeDescription) other: NOAA National Centers for Environmental Information lineage: (LI_Lineage) processStep: (LE_ProcessStep) description: NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. dateTime: DateTime: 2015-04-22T00:00:00 return to top metadataMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) annually maintenanceNote: This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard (version FGDC-STD-012-2002) using the 2012-08-08 version of the FGDC RSE to ISO 19115-2 transform. maintenanceNote: Translated from FGDC 2012-10-10T11:06:46-06:00 maintenanceNote: This record was automatically modified on 2015-09-18 to include references to NCEI where applicable. contact: (CI_ResponsibleParty) organisationName: NOAA National Centers for Environmental Information positionName: Metadata Specialist role: (CI_RoleCode) editor contact: (CI_ResponsibleParty) individualName: Justin Mabie organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce positionName: Space and Terrestrial Weather Specialist contactInfo: (CI_Contact) phone: (CI_Telephone) voice: (303) 497-6135 facsimile: (303) 497-6513 address: (CI_Address) deliveryPoint: 325 Broadway, Mail Code E/GC4 city: Boulder administrativeArea: CO postalCode: 80305-3328 country: USA electronicMailAddress: Justin.Mabie@noaa.gov role: (CI_RoleCode) pointOfContact | |