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Metadata Identifier: gov.noaa.ngdc.stp.ionosphere:G00569

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 Measurements of the Absorptive Properties of the Ionosphere Absorption of radio waves occurs when electrons responding to the wave fields collide with and transfer energy to the neutral particles. A study of ionospheric absorption yields information on both the D and E regions, where both electrons and neutral particles exist in sufficient quantity to produce significant absorption. Knowledge of D region characteristics is unattainable from normal sweep-frequency ionograms because absorption prevents the return of a detectable reflected signal. In practice, absorption characteristics are studied primarily in connection with radio communications applications. A riometer (relative ionospheric opacity meter) is a detector that measures the absorptive properties of the ionosphere. This directional detector is oriented in a fixed direction relative to the Earth (usually vertical) and measures the incident cosmic radio noise at a single frequency between 8 MHz and 120 MHz (usually 20, 30, or 60 MHz). During the course of each sidereal day, the riometer receives noise from all celestial longitudes. Due to the general constancy of cosmic radio noise, the signal will be constant except for a large-scale, small-amplitude, daily solar effect which regresses through the observations at the rate of 1 day per year (4 minutes earlier each day). Deviations of observed riometer signal power are primarily attributable to ionospheric variations particularly in the D and E regions. This method is particularly useful during radio blackout (high absorption) since it involves the use of higher frequency signals that are not completely absorbed. The Alaskan Chain Riometer data was discontinued, in analog form, December 31, 1990. The Data Center still receives riometer data from Kiruna. The publication includes magnetograms, k-indices, all-sky camera data, and riometer data. It is published quarterly. We also receive some riometer data from Syowa Station. The data are collections of several years of data and the publication (JARE DATA REPORTS) are sent by the National Institute of Polar Research, Tokyo Japan. These publications only have numeric values. All riometer data are in paper form and are stored off site. Most of the data are ''strip charts'' which record the variations on paper rolls. This data base is mostly a collection of the different charts and publications. No additional quality control is done by the National Geophysical Data Center (NGDC) here in Boulder. Data requested are electrostatic copies of the appropriate portion of a chart of publication.
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SV_Identification

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CI_Citation

Count Component Title Date Citation Identifier
1 Measurements of the Absorptive Properties of the Ionosphere
  • 1964-01-01
1 NASA/GCMD Earth Science Keywords
    1 NASA/GCMD Location Keywords
      1 Uncontrolled Keywords
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        CI_Series

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        CI_ResponsibleParty

        Count Component Individual Organization Position Email Role Linkage
        3 Rob Redmon DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ionosphere.ngdc@noaa.gov pointOfContact
        1 Rob Redmon DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ionosphere.ngdc@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
        2 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

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        MD_Identifier or RS_Identifier

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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 1963-01-01 1990-12-31
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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 1963-01-01 1990-12-31
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        MD_Format

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        MD_Medium

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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

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        MD_GridSpatialRepresentation

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        MD_Georeferenceable or MI_Georeferenceable

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        MD_Georectified or MI_Georectified

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        MD_Dimension

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        MD_CoverageDescription or MI_CoverageDescription

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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

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        LE_ProcessStep or LI_ProcessStep

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        MI_Operation

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        MI_Platform

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        MI_Instrument

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