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Solar Features - Solar Flares - SIDS

browse graphicDiagram showing effect of a sudden ionospheric disturbance (SID) on the usable frequency window which is the unshaded region between the lowest usable frequency (LUF) and the maximum usable frequency (MUF). Normally, both the MUF and LUF increase when the sun rises, thereby keeping a band between them open for HF communications. But during a strong SID, the LUF will increase to a frequency higher than the MUF, thus closing the usable frequency window, an event called a short wave fadeout. Note the rapid onset of the SID that is typical of these disturbances.
A Sudden Ionospheric Disturbance (SID) is any of several radio propagation anomalies due to ionospheric changes resulting from solar or geophysical events.
Cite this dataset when used as a source.
Distribution Formats
  • pdf
    • File Specification: Most data provided in Adobe Portable Document Format (pdf).
  • txt
    • File Specification: Some data provide in American Standard Code for Information Interchange (ASCII) text format.
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    • File Specification: Some data provided in non-standard formats
Distributor William Denig
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-6323
solar.ngdc@noaa.gov
Dataset Point of Contact William Denig
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-6323
solar.ngdc@noaa.gov
Documentation links not available.
Date(s)
  • publication: 2011-10-01
Dataset Progress Status Under development
Data Update Frequency: Annually
Supplemental Information:
Collection consists of tabular lists and information related to solar features
Purpose: To provide scientific data stewardship of solar-terrestrial datasets in compliance with NOAA Administrative Order (NAO) 212-15, "Management of Environmental and Geospatial Data and Information", dated 04 Nov 10. Scientific Data Stewardship includes the Archive, Access, and Assessment (AAA) of operational and related solar and space environmental datasets.
Originator(s)
  • Scientific Data Stewardship provided by the National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce.
Publisher(s)
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Time Period: 1818-01-01 to 2009-12-30
Spatial Reference System:
Spatial Bounding Box Coordinates:
N: 90
S: -90
E: 180
W: -180
Spatial Coverage Map:
Theme keywords 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.
  • Sun-Earth Interactions > Solar Activity > Solar Active Regions
  • Sun-Earth Interactions > Solar Activity > Solar X-ray Emissions
  • Sun-Earth Interactions > Ionosphere/Magnetosphere Dynamics
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Platform keywords 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.
  • RADIO TRANMITTERS
Instrument keywords 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.
  • Ionosonde
Place keywords 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.
  • Vertical Location > Ionosphere
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • ICSU-WDS > International Council for Science - World Data System
  • NOAA - Space Weather Program
Use Constraints
  • Access Constraints: None Use Constraints: None Distribution Liability: 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.
Access Constraints
  • Access Constraints: None Use Constraints: None Distribution Liability: 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.
Fees
  • Data can be downloaded free of charge.
Lineage information for: repository
Processing Steps
  • 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.
Lineage information for: series
Lineage Statement Authoritative data provided by various institutions.
Processor
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Source Datasets
  • Collection included as a part of the NGDC Official Archive.
    • Description of Source: The NOAA Solar and Terrestrial Physics Division is responsible for managing this collection.
    • Temporal extent used: 2009-10-01 to 2010-09-30
  • Solar Flares: X-rays
Acquisition Information (collection)
Instrument
Platform
Last Modified: 2015-10-02
For questions about the information on this page, please email: solar.ngdc@noaa.gov