US-Total Electron Content Product (USTEC)

Metadata from the NOAA Metadata Manager's Repository (NMMR)

• Identification_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:DOC/NOAA/NWS/SWPC > Space Weather Prediction Center, National Weather Service, NOAA, U.S. Department of Commerce

Publication_Date:20060401

Title:

US-Total Electron Content Product (USTEC)

Online_Linkage:http://www.swpc.noaa.gov/ustec/

Online_Linkage:http://www.ngdc.noaa.gov/stp/IONO/USTEC/

Description:

Abstract:

The US Total Electron Content (US-TEC) product is designed to specify TEC over the Continental US (CONUS) in near real-time. The product uses a Kalman Filter data assimilation model, described in the Technical Documentation. This technique is driven by data from ground-based Global Positioning System (GPS) dual frequency receivers. The primary data stream comes from the Maritime and Nationwide Differential GPS (M/NDGPS) real time network of stations operated by the US Coast Guard (USCG). As of January 2006, there were about 130 stations ingested into the model. This number has been gradually increasing and will be augmented by Federal Aviation Administration/Wide Area Augmentation System (FAA/WAAS) data, and new stations in areas with poor coverage. This product has evolved through a collaboration between the Space Weather Prediction Center (SWPC), the National Geodetic Survey (NGS), the National Geophysical Data Center (NGDC), and the Global Systems Division (GSD).

Purpose:

The product is designed for single and dual frequency GPS applications. The TEC and slant path maps can be used to estimate the GPS signal delay due to the ionospheric electron content between a receiver and a GPS satellite. Of particular interest to users is the link to Data files which provides not only tabular values of the total electron content, but also values of line-of-sight (LOS) or slant path electron content to each GPS satellite in view over the CONUS. For each GPS satellite in view the LOS maps provide 1 degree x1 degree two-dimensional grids over the CONUS.

Supplemental_Information:

http://www.swpc.noaa.gov/ustec/docs/USTEC_Doc.html

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date:20041014

Ending_Date:Present

Currentness_Reference:

Ground Condition

Status:

Progress:In work

Maintenance_and_Update_Frequency:Daily

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:-150

East_Bounding_Coordinate:-50

North_Bounding_Coordinate:60

South_Bounding_Coordinate:10

Keywords:

Theme:

Theme_Keyword_Thesaurus:NASA/GCMD Earth Science Keywords

Theme_Keyword:Earth Science > Sun-Earth Interactions > Ionosphere/Magnetosphere Particles

Theme_Keyword:Earth Science > Sun-Earth Interactions > Solar Energetic Particle Properties > Total Electron Content

Theme:

Theme_Keyword_Thesaurus:ISO 19115 Topic Categories

Theme_Keyword:geoscientificInformation

Access_Constraints:none

Use_Constraints:

none

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Contact_Person:Rob Redmon

Contact_Address:

Address_Type:Mailing and Physical

Address:

NOAA/NESDIS/NGDC 325 Broadway

City:Boulder

State_or_Province:CO

Postal_Code:80305

Country:USA

Contact_Voice_Telephone:(303) 497-4331

Contact_Facsimile_Telephone:(303) 497-6513

Contact_Electronic_Mail_Address:ionosphere@noaa.gov

Hours_of_Service:7:30 - 5:00 Mountain

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:USTEC Archive Package

Entity_Type_Definition:

All the USTEC product files are tarred and then g-zipped at the end of the day.

Entity_Type_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA. USTEC Data/Products Submission Agreement

Attribute:

Attribute_Label:Image files (Portable Network Graphics, PNG)

Attribute_Definition:

96 Vertical Total Electron Content files, 96 Uncertainty in TEC files, 96 Recent Trend files

Attribute_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA. USTEC Data/Products Submission Agreement

Attribute_Domain_Values:

Unrepresentable_Domain:

Unrepresentable.

Attribute:

Attribute_Label:Daily Empirical Orthonomal Functions

Attribute_Definition:

The EOFs define the background conditions at the beginning of each day. Produced once (1) per day.

Attribute_Definition_Source:

International Reference Ionosphere (IRI)

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum:0.00001

Range_Domain_Maximum:1.0000

Attribute_Units_of_Measure:TECU (10**16 electrons/m**2)

Attribute:

Attribute_Label:Coefficients for the EOFs

Attribute_Definition:

These coefficients will adjust the background conditions in function of the data ingested. Produced every 15 minutes (96 files).

Attribute_Definition_Source:

USTEC

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum:-10.0000

Range_Domain_Maximum:10.0000

Attribute_Units_of_Measure:TECU (10**16 electrons/m**2)

Attribute:

Attribute_Label:Vertical and Slant Data Values in Total Electron Content

Attribute_Definition:

Numerical values of the vertical and slant TEC produced every 15 minutes (96 files).

Attribute_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum:0.0000

Range_Domain_Maximum:100.0000

Attribute_Units_of_Measure:TECU (10**16 electrons/m**2) ** 10

Attribute:

Attribute_Label:TEC Trend

Attribute_Definition:

Deviation of the Vertical TEC from the average of the most recent 10 previous days used in the total electron content assimilation. Produced every 15 minutes (96 files).

Attribute_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum:-100.0000

Range_Domain_Maximum:100.000

Attribute_Units_of_Measure:TECU (10**16 electrons/m**2)

Attribute:

Attribute_Label:Uncertainty of the vertical TEC

Attribute_Definition:

Expected error of the vertical TEC calculated as a function of the state error and the trend of the values. Produced every 15 minutes (96 files).

Attribute_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum:2.00

Range_Domain_Maximum:7.00

Attribute_Units_of_Measure:TECU (10**16 electrons/m**2) ** 10

Attribute:

Attribute_Label:Stations used in TEC assimilation

Attribute_Definition:

Data from different sources: CORS (Continuously Operating Reference Stations), GPS-MET (GPS-Meteorological), RTIGS (Real-Time International GNSS Services). Produced every 15 minutes (96 files).

Attribute_Definition_Source:

Space Weather Prediction Center (SWPC), National Weather Service, NOAA

Attribute_Domain_Values:

Unrepresentable_Domain:

Unrepresentable.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Contact_Person:Rob Redmon

Contact_Address:

Address_Type:Mailing and Physical

Address:

NOAA/NESDIS/NGDC 325 Broadway

City:Boulder

State_or_Province:CO

Postal_Code:80305

Country:USA

Contact_Voice_Telephone:(303) 497-4331

Contact_Facsimile_Telephone:(303) 497-6513

Contact_Electronic_Mail_Address:ionosphere@noaa.gov

Hours_of_Service:7:30 - 5:00 Mountain

Resource_Description:Downloadable Data

Distribution_Liability:

None

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name:ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:http://www.swpc.noaa.gov/ustec/text/

Network_Resource_Name:http://www.ngdc.noaa.gov/stp/IONO/USTEC/

Network_Resource_Name:http://www.ngdc.noaa.gov/stp/IONO/USTEC/products/

Digital_Form:

Digital_Transfer_Information:

Format_Name:PNG Plots

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:http://www.swpc.noaa.gov/ustec/all_tec_plots.html

Fees:Free download availability

Metadata_Reference_Information:

Metadata_Date:20101022

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce

Contact_Person:Rob Redmon

Contact_Address:

Address_Type:Mailing and Physical

Address:

NOAA/NESDIS/NGDC 325 Broadway

City:Boulder

State_or_Province:CO

Postal_Code:80305

Country:USA

Contact_Voice_Telephone:(303) 497-4331

Contact_Facsimile_Telephone:(303) 497-6513

Contact_Electronic_Mail_Address:ionosphere@noaa.gov

Hours_of_Service:7:30 - 5:00 Mountain

Metadata_Standard_Name:Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata

Metadata_Standard_Version:FGDC-STD-012-2002

Metadata_Extensions:

Online_Linkage:http://www.ngdc.noaa.gov/metadata/extensions/local_extensions.html

Profile_Name:NGDC Extensions to FGDC Metadata