Metadata Identifier: gov.noaa.ngdc.stp.solar:solar-features_solar-features_solar-radio

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 Solar Radio Scientists monitor the structure of the solar corona, the outer most regions of the Sun's atmosphere, using radio waves (100?s of MHz to 10?s of GHz). Variations in the radiowave spectrum reveal characteristics of the corona and upper chromosphere in terms of altitude profile for the local plasma temperature, density and magnetic field. Typically, the lower the frequency then the higher the height of origin. The frequency, like the solar electron density, decreases uniformly outwards with 245 MHz originating high in the corona whereas 15,400 MHz originates in the low corona. Radio bursts are associated with solar flares. The delay at Earth of the different radio frequencies during burst events is due to the outward movement of the source. Bursts can have temperatures of 10xE12 degrees Kelvin. Large bursts last 10 to 20 minutes on average. Longer radio noise storms of persistent and variable high levels of radiation originate in sunspot groups, areas of large, intense magnetic fields. These storms are strongly circularly polarized due to the intense magnetic fields. The microwave wavelength 2800 MHz daily radio flux correlates highly with the daily sunspot number and the two databases are used interchangeably. The 2800 MHz, or 10.7 cm, responds to the same conditions that produce changes in the visible and X-ray wavelengths. Schmahl and Kundu (1995) find that the solar radio fluxes in the spectral range 1000-9400 MHz correlate well with the total solar irradiance. The intermediate frequencies (at 2800 and 3750 MHz) are produced mainly by free-free gyroresonance emission from sunspot structures, while 1000 and 9400 MHz flux are produced mainly by free-free processes from structures associated with plages. They can distinguish plage-associated emission from spot-associated emission in the time series of microwave flux, both contributing opposing effects on the total solar irradiance.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Collection included as a part of the NGDC Official Archive.
    2011-01-01
1 GCMD Data Center Keywords Global Change Master Directory (GCMD) Data Center Keywords
    2020-01-09
1 GCMD Project Keywords Global Change Master Directory (GCMD) Project Keywords
    2020-01-09
1 NASA/GCMD Earth Science Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 6.0.0.0.0.
    2007
1 NASA/GCMD Instrument Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 6.0.0.0.0.
    2007
1 NASA/GCMD Location Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 6.0.0.0.0.
    2007
1 NASA/GCMD Platform Keywords; Olsen, L.M., G. Major, K. Shein, J. Scialdone, R. Vogel, S. Leicester, H. Weir, S. Ritz, T. Stevens, M. Meaux, C.Solomon, R. Bilodeau, M. Holland, T. Northcutt, R. A. Restrepo, 2007 . NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 6.0.0.0.0.
    2007
1 Solar Flares: H-alpha
    1 Solar Radio
      2012-10-14
    		solarFeatures
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    CI_Series

    none found
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    CI_ResponsibleParty

    Count Component Individual Organization Position Email Role Linkage
    1 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce resourceProvider
    2 GCMD Landing Page NASA Goddard Space Flight Center, Earth Science Data and Information System custodian https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
    1 NCEI (publisher) NOAA National Centers for Environmental Information publisher
    1 Anna Milan NOAA National Centers for Environmental Information Metadata Specialist editor
    1 NOAA National Geophysical Data Center (NGDC) solar.ngdc@noaa.gov resourceProvider https://www.ngdc.noaa.gov/
    1 Scientific Data Stewardship provided by the National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce. originator
    4 William Denig (pointOfContact) William Denig DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov pointOfContact
    1 William Denig DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce processor
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    CI_OnlineResource

    Count Component Linkage Name Description Function
    1 ftp://ftp.ngdc.noaa.gov/STP/space-weather/solar-data/solar-features/solar-radio/ Solar Radio Data A variety of datasets related to solar radio emissions. Included are datasets related to solar radio bursts (tables and reports), listings from the International Astronomical Union's Bulletin of Solar Activity (53 stations), noontime solar radio flux measurements (5 stations), 1-sec solar flux measurements from the Radio Solar Telescope Netword (RSTN), and RSTN solar spectral measurements. download
    2 https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords Global Change Master Directory (GCMD) Keywords 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. information
    1 https://www.ngdc.noaa.gov/ NOAA National Geophysical Data Center (NGDC) NOAA's National Geophysical Data Center (NGDC) provides scientific stewardship, products, and services for geophysical data from the Sun to the Earth and Earth's sea floor and solid earth environment, including Earth observations from space.
    1 https://www.ngdc.noaa.gov/stp/spaceweather.html Space Weather Numerous space environmental datasets are available at the NGDC/STP website information
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    MD_Identifier or RS_Identifier

    Count Component Code
    2
    1 solarFeatures
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    EX_Extent

    Bounding Box Temporal Extent
    Count Component Description West East North South Start End
    1 Data assembled from data provided by various solar observatories located worldwide. -180 180 90 -90 1955-07-01 2010-11-24
    1 1955-07-01 2010-11-24
    1 1955-07-01 2010-11-24
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    EX_GeographicBoundingBox

    Count Component West East North South
    1 -180 180 90 -90
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    EX_TemporalExtent

    Count Component Start End
    3 1955-07-01 2010-11-24
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    MD_Format

    Count Component Name Version specification
    1 binary Some data provided in native format as received from provider.
    1 pdf Most data provided in Adobe Portable Document Format (pdf).
    1 txt Some data provide in American Standard Code for Information Interchange (ASCII) text format.
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    MD_Medium

    Count Component Name mediumFormat mediumNote
    1
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    MD_Constraints

    Count Component Use Limitation
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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

    Count Component Attribute Description Content Type
    1
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    MD_Band or MI_Band

    Count Component Identifier Descriptor
    1 Solar features
    1 Collection includes a variety of solar feature datasets contributed by a number of national and private solar observatories located worldwide. Collection includes lists of optical solar flares observed in H-alpha and x-rays, solar radio data, prominences and filaments, plague regions and faculae, and sunspots.
    1
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    MI_RangeElementDescription

    none found
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    MD_AggregateInformation

    none found
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    LE_Source or LI_Source

    Count Component Title Date Description
    1 Collection included as a part of the NGDC Official Archive. 2011-01-01 The NOAA Solar and Terrestrial Physics Division is responsible for managing this collection.
    1 Solar Flares: H-alpha Flares observed in H-alpha.
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    LE_ProcessStep or LI_ProcessStep

    Count Component DateTime Description
    1 Datasets prepared by professional staff within the Solar and Terrestrial Physics Division at the National Geophysical Data Center.
    1 2010-09-30T00:00:00 Flare listings compiled using data received from various solar observatories.
    1 2015-04-22T00:00:00 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.
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    MI_Operation

    none found
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    MI_Platform

    Count Component Code Description
    1 Solar observatories
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    MI_Instrument

    Count Component Code Type Description
    2
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