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Metadata Identifier: gov.noaa.ngdc.stp.ionosphere:G00581

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 Sudden Ionospheric Disturbances (SID) 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.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 NASA/GCMD Data Center Keywords
    1 NASA/GCMD Earth Science Keywords
      1 NASA/GCMD Location Keywords
        1 Sudden Ionospheric Disturbances (SID)
        • 1958-01-01
        1 Uncontrolled Keywords
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          CI_Series

          none found
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          CI_ResponsibleParty

          Count Component Individual Organization Position Email Role Linkage
          1 Citation URL ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/Sudden_Ionospheric_Disturbances
          3 Rob Redmon DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ionosonde@noaa.gov pointOfContact
          1 Rob Redmon DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ionosonde@noaa.gov distributor
          1 User Services DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ngdc.info@noaa.gov publisher
          1 User Services DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ngdc.info@noaa.gov originator
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          CI_OnlineResource

          Count Component Linkage Name Description Function
          3 ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/Sudden_Ionospheric_Disturbances Sudden Ionospheric Disturbances Home page information
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          MD_Identifier or RS_Identifier

          none found
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          EX_Extent

          Bounding Box Temporal Extent
          Count Component Description West East North South Start End
          1 -180.000000 180.000000 90.000000 -90.000000 1958-01-01
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          EX_GeographicBoundingBox

          Count Component West East North South
          1 -180.000000 180.000000 90.000000 -90.000000
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          EX_TemporalExtent

          Count Component Start End
          1 1958-01-01
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          MD_Format

          Count Component Name Version specification
          1 ASCII
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          MD_Medium

          none found
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          MD_Constraints

          Count Component Use Limitation
          1 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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          MD_ReferenceSystem

          none found
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          MD_GridSpatialRepresentation

          none found
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          MD_Georeferenceable or MI_Georeferenceable

          none found
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          MD_Georectified or MI_Georectified

          none found
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          MD_Dimension

          none found
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          MD_CoverageDescription or MI_CoverageDescription

          none found
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          MD_Band or MI_Band

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          MI_RangeElementDescription

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          MD_AggregateInformation

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          LE_Source or LI_Source

          none found
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          LE_ProcessStep or LI_ProcessStep

          none found
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          MI_Operation

          none found
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          MI_Platform

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          MI_Instrument

          none found
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