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Metadata Identifier: gov.noaa.ngdc.stp.solar:G01256

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 Flares in Hydrogen Alpha and X-rays A solar flare is a short-lived sudden increase in the intensity of radiation emitted in the neighborhood of sunspots. For many years it was best monitored in the H-alpha wavelength and occurs in the chromosphere, though occasionally white light flares are seen in the photosphere. In modern times the solar X-ray wavelengths are monitored via satellite for solar flares. Flares are characterized by a rise time of the order of minutes and a decay of the order of tens of minutes. The total energy expended in a typical flare is about 10**30 ergs; the magnetic field is extraordinarily high, reaching values of 100 to 10,000 gauss. Optical flares in H-alpha are usually accompanied by radio and X-ray bursts, and occasionally by high-energy particle emissions. The optical brightness and size of the flare are indicated by a two-character code called "importance." The first character, a number from 1 to 4, indicates the apparent area. For areas of less than 1, an "S" is used to designate a subflare. The second character indicates relative brilliance: B for bright, N for normal and F for faint. A general discussion of solar flares is found in Svestka's, SOLAR FLARES (1976). The National Geophysical Data Center (NGDC) holds archives for about 80 stations, covering the period 1938 to the present. Currently 5 stations send their data to NGDC Boulder on a routine monthly basis -- the current main observing emphasis for Space Weather has transitioned to Coronal Mass Ejections (CMEs) which directly impact the Earth's geomagnetic field. Solar flares impact the Earth's upper atmosphere and can eject high energy particles that can cause satellite failures. The flare reports are processed and published in the monthly report "Solar-Geophysical Data" and in a different format in the IAU "Quarterly Bulletin on Solar Activity."
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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 Location Keywords
      1 GCMD Science Keywords NASA/Global Change Master Directory (GCMD) Earth Science Keywords
      • 2007-04
      1 Solar Flares in Hydrogen Alpha and X-rays
      • 1919
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      CI_Series

      Count Component Name Issue Identification Page
      1 Solar Geophysical Data (SGD) International Standard Serial Numbers (ISSN) ISSN 0038-0911 Solar Geophysical Data (SGD) Published Monthly
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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 (comp) publisher
      1 NASA/GSFC/SED/ESD/GCDC/GCMD > Global Change Master Directory, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA resourceProvider http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html
      2 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov pointOfContact
      1 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov distributor
      1 Solar Data Manager DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce solar.ngdc@noaa.gov custodian
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      CI_OnlineResource

      Count Component Linkage Name Description Function
      2 ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_FLARES
      1 http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html GCMD Keywords, Version 6.0.0.0.0 Thesuarus for earth science keywords and associated directories hosted and maintained by NASA. information
      1 http://www.ngdc.noaa.gov/stp/SOLAR/ftpsolarflares.html
      1 http://www.ngdc.noaa.gov/stp/SOLAR/ftpsolarimages.html
      1 http://www.ngdc.noaa.gov/stp/SOLAR/getdata.html
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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 1919-03-01
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      EX_GeographicBoundingBox

      none found
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      EX_TemporalExtent

      Count Component Start End
      1 1919-03-01
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      MD_Format

      Count Component Name Version specification
      1 ASCII
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      MD_Medium

      Count Component Name mediumFormat mediumNote
      1 cdRom iso9660
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      MD_Constraints

      Count Component Use Limitation
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      MD_ReferenceSystem

      none found
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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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