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Sudden Ionospheric Disturbances (SID)

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        individualName:  Rob Redmon
        organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                voice:  (303) 497-4331
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                deliveryPoint:  NOAA/NESDIS/NGDC 325 Broadway
                city:  Boulder
                administrativeArea:  CO
                postalCode:  80305
                country:  USA
                electronicMailAddress:  ionosonde@noaa.gov
            hoursOfService:  7:30 - 5:00 Mountain
        role:  (CI_RoleCode) pointOfContact
    dateStamp:  2010-10-15
    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  Sudden Ionospheric Disturbances (SID)
            date:  (CI_Date)
                date:  1958-01-01
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                        voice:  (303) 497-6826
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                        deliveryPoint:  NOAA/NESDIS/NGDC E/GC 325 Broadway
                        city:  Boulder
                        administrativeArea:  CO
                        postalCode:  80305-3328
                        country:  USA
                        electronicMailAddress:  ngdc.info@noaa.gov
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                        deliveryPoint:  NOAA/NESDIS/NGDC E/GC 325 Broadway
                        city:  Boulder
                        administrativeArea:  CO
                        postalCode:  80305-3328
                        country:  USA
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                        linkage:  ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/Sudden_Ionospheric_Disturbances
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                        name:  Sudden Ionospheric Disturbances
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        abstract:  Sudden ionospheric disturbances (SID) are caused by solar flare enhanced X-rays in the 1 to 10 angstrom range. Solar flares can produce large increases of ionization in the D-region of the ionosphere over the daylit hemisphere of the Earth. SID's typically begin simultaneously or a few minutes after the start of a solar flare, and can have a time duration somewhat longer than the flare with a rise time more rapid than the decay time.Types of SIDs are SCNA--sudden cosmic noise absorption is a riometer-detected sudden daytime absorption increases; SEA--sudden enhancement of atmospherics are increases in signal strength on wideband equipment operated in the VLF, 10 to 50 KHz frequency range; SES--sudden enhancement of signal, observed on VLF frequencies in the 15 to 50 KHz range are nearly identical to SEA except that the receivers are narrow-band receivers designed to pick up man-made VLF transmission. Like SEA, signal strength increase is the SID indicator; SFD--sudden frequency deviation is the sudden increase of high frequency radiowaves which reaches a peak, and then decays back to the transmitting frequency; SPA--sudden phase anomaly is an abrupt shift in the phase of a radio signal on VLF frequencies received by ionospheric reflection; SWF--short wave fadeouts are abrupt decreases of radio signal strength observed at VLF frequencies.Tables of SIDs include the date; beginning, maximum and ending times; type of SID; importance on a scale of 1- to 3+ and the corresponding solar flare, if known.
        purpose:  Solar Disturbances Research
        status:  (MD_ProgressCode) underDevelopment
        pointOfContact:  (CI_ResponsibleParty)
            individualName:  Rob Redmon
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            contactInfo:  (CI_Contact)
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                    voice:  (303) 497-4331
                    facsimile:  (303) 497-6513
                address:  (CI_Address)
                    deliveryPoint:  NOAA/NESDIS/NGDC 325 Broadway
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305
                    country:  USA
                    electronicMailAddress:  ionosonde@noaa.gov
                hoursOfService:  7:30 - 5:00 Mountain
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            keyword:  EARTH SCIENCE > Sun-earth Interactions > Solar Activity > Solar Radio Waves
            type:  (MD_KeywordTypeCode) theme
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                title:  NASA/GCMD Earth Science Keywords
                date:
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Solar Physics
            keyword:  Short Wave Fade
            keyword:  Sudden Phase Anomaly
            keyword:  Solar Flare Atmospherics
            keyword:  D Region
            keyword:  Soft X-Rays
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            keyword:  WDC/STP, BOULDER > World Data Center for Solar-Terrestrial Physics, Boulder
            keyword:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                title:  NASA/GCMD Data Center Keywords
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            keyword:  Ionosphere
            type:  (MD_KeywordTypeCode) place
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                title:  NASA/GCMD Location Keywords
                date:
        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.
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            otherConstraints:  Use Constraints: None
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        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) geoscientificInformation
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                extent:
                  TimePeriod:
                    beginPosition:  1958-01-01
                    endPosition:
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        distributionFormat:  (MD_Format)
            name:  ASCII
            version:
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                individualName:  Rob Redmon
                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  (303) 497-4331
                        facsimile:  (303) 497-6513
                    address:  (CI_Address)
                        deliveryPoint:  NOAA/NESDIS/NGDC 325 Broadway
                        city:  Boulder
                        administrativeArea:  CO
                        postalCode:  80305
                        country:  USA
                        electronicMailAddress:  ionosonde@noaa.gov
                    hoursOfService:  7:30 - 5:00 Mountain
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                linkage:  ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/Sudden_Ionospheric_Disturbances
                protocol:  ftp
                name:  Index of Sudden Ionospheric Disturbances
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                linkage:  ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/Sudden_Ionospheric_Disturbances
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        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 2012-10-10T11:10:06.72-06:00
        contact:  (CI_ResponsibleParty)
            individualName:  Rob Redmon
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  (303) 497-4331
                    facsimile:  (303) 497-6513
                address:  (CI_Address)
                    deliveryPoint:  NOAA/NESDIS/NGDC 325 Broadway
                    city:  Boulder
                    administrativeArea:  CO
                    postalCode:  80305
                    country:  USA
                    electronicMailAddress:  ionosonde@noaa.gov
                hoursOfService:  7:30 - 5:00 Mountain
            role:  (CI_RoleCode) pointOfContact