Solar Features - Solar Flares - SIDS
Diagram 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.
- solarFeatures
gov.noaa.ngdc.stp.solar:solar-features_solar-flares_sids
Distribution Formats |
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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 |
Coverage Description | Data provided by various solar observatories located worldwide. Data record range is from 1818 to present. |
Time Period | 1818-01-01 to 2009-12-30 |
Spatial Bounding Box Coordinates |
West:-180
East:180
South:-90
North:90
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Spatial Coverage Map |
Documentation links not available. |
Publication Dates |
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Dataset Progress Status | Under development - data is currently in the process of being created |
Data Update Frequency | Annually |
Supplemental Information |
Collection consists of tabular lists and information related to solar features
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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. |
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Acknowledgments |
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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.
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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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.
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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.
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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.
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Project keywords | Global Change Master Directory (GCMD) Project Keywords
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Fees |
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Lineage Statement | Authoritative data provided by various institutions. |
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Last Modified: 2015-10-02
For questions about the information on this page, please email:solar.ngdc@noaa.gov