Boulder Magnetic Observatory

Metadata from the NOAA Metadata Manager and Repository (NMMR)


Identification Information:
Dataset Identifier:
BOU03
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:
2005
Title:
Boulder Magnetic Observatory
More Information:
National Geomagnetism Program
Monitoring of the Earth's magnetic field for research and practical applications.
Description:
Abstract:
These data are vector and scalar component values of the Earth's magnetic field for the Boulder Magnetic Observatory in Colorado. 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.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date:
20040101
Ending Date:
20041231
Currentness Reference:
ground condition
Status:
Progress:
In work
Maintenance and Update Frequency:
Irregular
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate:
-105.24
East Bounding Coordinate:
-105.24
North Bounding Coordinate:
49.86
South Bounding Coordinate:
49.86
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
Access Constraints:
None
Use Constraints:
Contact Institution
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/.../BOU04BLV.JPG
Browse Graphic File Description:
Baseline values for the Boulder calibration data.
Browse Graphic File Type:
JPEG
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Data Quality Information:
Attribute Accuracy:
Attribute Accuracy Report:
Data from the Boulder Magnetic Observatory met the requirements for being an INTERMAGNET Magnetic Observatory (IMO), and as such met the specifications listed in theINTERMAGNET 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).
Process Date:
Unknown
Process Step:
Process Description:
Base line plot for Boulder Observatory are located at:

ftp:wdcftp.ngdc.noaa.gov/
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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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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 Value:
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:
December 2001
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:
20070118
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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