Solar Features - Solar Flares - SIDS

Metadata Updated: February 1, 2017

A Sudden Ionospheric Disturbance (SID) is any of several radio propagation anomalies due to ionospheric changes resulting from solar or geophysical events.

Access & Use Information

Downloads & Resources

Dates

Metadata Date October 2, 2015
Metadata Created Date September 26, 2015
Metadata Updated Date February 1, 2017
Reference Date(s) October 1, 2011 (publication)
Frequency Of Update annually

Metadata Source

Harvested from NOAA CSW Harvest Source

Graphic Preview

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.

Additional Metadata

Resource Type Nongeographicdataset
Metadata Date October 2, 2015
Metadata Created Date September 26, 2015
Metadata Updated Date February 1, 2017
Reference Date(s) October 1, 2011 (publication)
Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Contact Email
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.
Bbox East Long 180
Bbox North Lat 90
Bbox South Lat -90
Bbox West Long -180
Coupled Resource
Frequency Of Update annually
Graphic Preview Description 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.
Graphic Preview File http://www.ngdc.noaa.gov/stp/space-weather/ionospheric-data/sids/documentation/browse_sid-event.jpg
Graphic Preview Type Joint Photographics Experts Group (JPG) format
Guid gov.noaa.ngdc.stp.solar:solar-features_solar-flares_sids
Harvest Object Id f741f96f-469e-477f-a192-dd6a41704eec
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1818-01-01
Temporal Extent End 2009-12-30

Didn't find what you're looking for? Suggest a dataset here.