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Barrow Magnetic Observatory

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


Identification_Information:
Citation:
Citation_Information:
Originator:DOI/USGS/GD/CR/GHT > Geologic Hazards Team, Central Region, Geology Division, USGS, U.S. Department of the Interior
Publication_Date:1933
Title:
Barrow Magnetic Observatory
Online_Linkage:http://geomag.usgs.gov
Description:
Abstract:
These data are vector and scalar component values of the Earth's magnetic field for the Barrow Magnetic Observatory in Alaska. Vector values are measured using 3 mutually orthogonal fluxgate magnetometer sensors. The scalar value of the total magnetic field is recorded with a proton precession magnetometer. All values are calibrated with measurements of the absolute value of the geomagnetic field using a DI-Flux magnetometer. The data are numerically filtered to prevent aliasing, and quality controlled during processing. Longer period values of the field, including hourly, daily, monthly, and annual means are derived from the 1-minute data.
Purpose:
To provide ground-based, calibrated values of the Earth's magnetic field at a specific location for scientific research and practical applications.
Supplemental_Information:
ELEVATION : 12 meters
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1933
Ending_Date:Present
Currentness_Reference:
ground condition
Status:
Progress:In work
Maintenance_and_Update_Frequency:Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-156.62
East_Bounding_Coordinate:-156.62
North_Bounding_Coordinate:71.32
South_Bounding_Coordinate:71.32
Keywords:
Theme:
Theme_Keyword_Thesaurus:NASA/GCMD Earth Science Keywords
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism > Geomagnetic Indices
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism > Magnetic Declination
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism > Magnetic Field
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism > Magnetic Inclination
Theme_Keyword:Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Category
Theme_Keyword:geoscientificInformation
Theme_Keyword:intelligenceMilitary
Theme_Keyword:utilitiesCommunication
Theme_Keyword:climatologyMeteorologyAtmosphere
Theme:
Theme_Keyword_Thesaurus:INTERMAGNET
Theme_Keyword:Magnetic Observatory Definitive Data
Access_Constraints:None
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:DOI/USGS/GD/CR/GHT > Geologic Hazards Team, Central Region, Geology Division, USGS, U.S. Department of the Interior
Contact_Person:Ms. Jill Caldwell
Contact_Address:
Address_Type:mailing
Address:
Box 25046 MS 968 Denver Federal Center
City:Denver
State_or_Province:Colorado
Postal_Code:80225-0046
Country:United States
Contact_Voice_Telephone:(303) 273-8486
Contact_Electronic_Mail_Address:jcaldwell@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:ftp://wdcftp.ngdc.noaa.gov/.../BRWBLV.JPG
Browse_Graphic_File_Description:
Baseline values for the Barrow calibration data.
Browse_Graphic_File_Type:JPEG
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data from the Barrow Magnetic Observatory met the requirements for being an INTERMAGNET Magnetic Observatory (IMO), and as such met the specifications listed in the INTERMAGNET Technical Manual (http://www.intermagnet.org//im_manual.pdf)
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:+/- 80,000 nT
Attribute_Accuracy_Explanation:
Dynamic Range
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:0.1 nT
Attribute_Accuracy_Explanation:
Resolution
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:1 Hertz (Hz)
Attribute_Accuracy_Explanation:
Sampling Rate
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:19-point Gaussian (1-minute values)
Attribute_Accuracy_Explanation:
Numeric Filter
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:+/- 5 nT (nanoTeslas) for definitive data
Attribute_Accuracy_Explanation:
Accuracy
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:5 nT/year
Attribute_Accuracy_Explanation:
Long Term Stability
Logical_Consistency_Report:
Various methods are used to check the integrity of the data. These include: (1) making comparisons between the total intensity values computed from the vector magnetometer and those measured by the scalar magnetometer, (2) comparing the field values reduced using the calibration data with those obtained during the weekly absolute measurements, and (3) visually inspecting the data and comparing with other stations.
Completeness_Report:
These data represent the complete record set for this station and this year.
Lineage:
Process_Step:
Process_Description:
These data were processed using algorithms developed at the U.S. Geological Survey (USGS).
Source_Used_Citation_Abbreviation:
Unknown
Process_Date:Unknown
Process_Step:
Process_Description:
Base line plot for Barrow Observatory are located at: ftp:wdcftp.ngdc.noaa.gov/
Source_Used_Citation_Abbreviation:
Unknown
Process_Date:Unknown
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:Magnetometer
Entity_Type_Definition:
A scientific instrument for measuring the strength of magnetic fields.
Entity_Type_Definition_Source:
http://en.wikipedia.org/wiki/Magnetometer
Attribute:
Attribute_Label:fluxgate magnetometer
Attribute_Definition:
A kind of magnetometer that detects second harmonic signals from a secondary coil surrounding an iron core that is driven into saturation by a primary coil using radio frequency signals. The second harmonic signal is proportional to the strength of the ambient magnetic field.
Attribute_Definition_Source:
http://www.earthsci.unimelb.edu.au/ES304/MODULES/MAG/NOTES/fluxgate.html
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a type of magnetometer instrument used for measuring the Magnetic Field
Attribute:
Attribute_Label:proton precession magnetometer
Attribute_Definition:
A kind of scalar magnetometer that measures only the strength of the total magnetic field vector and not its direction or components. A hydrogen-rich fluid is polarized using a strong electric current. When the current is turned off, the protons in the fluid precess around the ambient magnetic field at a frequency given by the gyromagnetic ratio and proportional to the strength of the surrounding magnetic field.
Attribute_Definition_Source:
http://en.wikipedia.org/wiki/Magnetometer#Scalar_magnetometers
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a type of magnetometer instrument used for measuring the Magnetic Field
Attribute:
Attribute_Label:Overhauser magnetometer
Attribute_Definition:
A type of scalar magnetometer that employs the precession of free unpaired electrons rather than protons in a fluid.
Attribute_Definition_Source:
http://en.wikipedia.org/wiki/Magnetometer#Scalar_magnetometers
Attribute_Domain_Values:
Unrepresentable_Domain:
This is a type of magnetometer instrument used for measuring the Magnetic Field
Detailed_Description:
Entity_Type:
Entity_Type_Label:Earth's Magnetic Field Components
Entity_Type_Definition:
The Earth's magnetic field is characterized by a direction and intensity which can be determined by various combinations of three of seven possible magnetic field components.
Entity_Type_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1970.
Attribute:
Attribute_Label:Inclination (I)
Attribute_Definition:
The angle which the line of force at a point of observation makes with the horizontal plane, positive when directed downward
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-90.0
Range_Domain_Maximum:90.0
Attribute_Units_of_Measure:Decimal Degrees or Degrees and Decimal Minutes
Attribute:
Attribute_Label:Declination (D)
Attribute_Definition:
The angle made by the magnetic meridian and the true north meridian, considered positive east of north and negative west of north
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-180.0
Range_Domain_Maximum:180.0
Attribute_Units_of_Measure:Decimal Degrees or Degrees and Decimal Minutes
Attribute:
Attribute_Label:Horizontal Intensity (H)
Attribute_Definition:
The projection of the geomagnetic field vector on the horizontal plane, always positive
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:0
Range_Domain_Maximum:40000.0
Attribute_Units_of_Measure:nanotesla
Attribute:
Attribute_Label:Vertical Intensity (Z)
Attribute_Definition:
The projection of the geomagnetic field vector on the vertical plane, positive when directed down
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-70000.0
Range_Domain_Maximum:60000.0
Attribute_Units_of_Measure:nanotesla
Attribute:
Attribute_Label:Total Intensity (F)
Attribute_Definition:
The scalar magnitude of the geomagnetic field vector, always positive
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:25000.0
Range_Domain_Maximum:80000.0
Attribute_Units_of_Measure:nanotesla
Attribute:
Attribute_Label:North Component (X)
Attribute_Definition:
The projection of the horizontal component (H) in the true meridian
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-10000.0
Range_Domain_Maximum:45000.0
Attribute_Units_of_Measure:nanotesla
Attribute:
Attribute_Label:East Component (Y)
Attribute_Definition:
The projection of the horizontal component on the true east direction, positive when directed eastward
Attribute_Definition_Source:
Wienert, K.A., Notes on geomagnetic observatory and survey practice, UNESCO Earth Sciences 5, 1971
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-20000.0
Range_Domain_Maximum:20000.0
Attribute_Units_of_Measure:nanotesla
Detailed_Description:
Entity_Type:
Entity_Type_Label:Geographic Location
Entity_Type_Definition:
A coordinate system that provides a means for expressing every location on the Earth using three coordinates of a spherical coordinate system which is aligned with the spin axis of the Earth.
Entity_Type_Definition_Source:
http://en.wikipedia.org/wiki/Geographic_location
Attribute:
Attribute_Label:Latitude
Attribute_Definition:
Latitude is an angular measurement in degrees that gives the location of a place on the Earth above (toward the North pole) or below (toward the South pole) of the equator.
Attribute_Definition_Source:
http://en.wikipedia.org/wiki/Latitude
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-90
Range_Domain_Maximum:+90
Attribute_Units_of_Measure:angular degrees
Attribute:
Attribute_Label:Longitude
Attribute_Definition:
Longitude is an angluar measurement in degrees that describes the location of a place on the Earth east or west of a north-south line called the Prime Meridian.
Attribute_Definition_Source:
http://en.wikipedia.org/wiki/Longitude
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:-180
Range_Domain_Maximum:+180
Attribute_Units_of_Measure:angular degrees
Attribute:
Attribute_Label:Elevation
Attribute_Definition:
Elevation is the vertical position of a location relative to some height above the Earth's surface, generally taken as the mean sea level or geoid.
Attribute_Definition_Source:
http://en.wikipedia.org/wiki/Geoid
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:0
Range_Domain_Maximum:unlimited
Attribute_Units_of_Measure:meters
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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:Susan McLean
Contact_Address:
Address_Type:Mailing and Physical Address
Address:
NOAA/NESDIS/NGDC E/GC2 325 Broadway
City:Boulder
State_or_Province:CO
Postal_Code:80305-3328
Country:USA
Contact_Voice_Telephone:(303) 497-6478
Contact_TDD/TTY_Telephone:(303) 497-6958
Contact_Facsimile_Telephone:(303) 497-6513
Contact_Electronic_Mail_Address:Susan.McLean@noaa.gov
Hours_of_Service:7:30 - 5:00 Mountain
Contact Instructions:
Contact Data Center
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:IAGA2002
Format_Version_Date:2002
Format_Specification:
http://www.ngdc.noaa.gov/IAGA/vdat/iagaformat.html
Format_Information_Content:
Columnar ASCII values including date, time, and magnetic field values, including header information pertinate to the individual observatory.
File_Decompression_Technique:generally ZIP
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:http://www.ngdc.noaa.gov/IAGA/vdat/iagaformat.html
Digital_Form:
Digital_Transfer_Information:
Format_Name:WDC-A
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:www.wdcb.ru/stp/data/geo_min.val/AIA-Argentine%20Islands/DIGITAL%20WDC%20FORMATS.doc
Access_Instructions:
This is an outdated ASCII format.
Fees:None
Ordering_Instructions:
Contact NGDC for instructions.
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Metadata_Reference_Information:
Metadata_Date:20080908
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:Don Herzog
Contact_Address:
Address_Type:mailing and physical
Address:
325 Broadway
City:Boulder
State_or_Province:CO
Postal_Code:80305
Country:USA
Contact_Voice_Telephone:303 497 6140
Contact_Electronic_Mail_Address:don.herzog@noaa.gov
Hours_of_Service:8:00 - 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
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Metadata stylesheets are provided courtesy of ESRI. Copyright (c) 2000-2002, Environmental Systems Research Institute, Inc. All rights reserved.

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Publication date:2008-09-23T07:52:23
Author:Administrator
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