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Victoria Magnetic Observatory

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


Identification_Information:
Citation:
Citation_Information:
Originator:Geological Survey of Canada
Publication_Date:1956
Title:
Victoria Magnetic Observatory
Online_Linkage:http://www.geolab.nrcan.gc.ca
Description:
Abstract:
The Victoria Geomagnetic Observatory was established in 1957 on the grounds of the Dominion Astrophysical Observatory ( now the National Research Council of Canada) on Little Saanich Mountain about 16 km north of Victoria, British Columbia. The Observatory is pleasantly situated, some 197 m above mean sea level, in a wooded area about 120 m northeast of the Dominion Astrophysical Observatory office building. The site was chosen in 1956 for convenience to observatory facilities and power, while maintaining adequate separation from buildings and pipelines. The area is one of acid intrusive rocks of Mesozoic age. A survey was made in 1956, using a 7.5 m grid separation of stations, to determine the vertical magnetic field intensity gradients. This revealed an average station difference, independent of sign, of 25 nT +/- 20 nT standard deviation in any one difference. No large anomalies exceeding 25 nT were found within 30 m of the building site and the distribution of small anomalies was apparently random. Beyond this distance to the southeast a decrease of 50 nT was noted. The building site was therefore chosen for its fllatness and convenience as the ground falls rather steeply on east part of the site. Originally the magnetic equipment occupied an insulated aluminium prefabricated 4.5 m x 6.5 m building, erected in 1956 with its long axis oriented in magnetic north-south. A permanent variometer building was completed in September, 1959, located about 30 m to the east of the original temporary building; it is an insulated 5.5 m x 5.5 m cement block structure containing two 2.5 m x 4.5 m rooms and a 1 m x 5.5 m light trap entrance. The floor is a single concrete slab resting on bedrock, providing flexibility in location of instruments as well as an effective heat-sink. The control equipment for the electronic magnetometer, as well as other auxiliary variometer equipment (chronometer, power supplies, etc.) remain in the original temporary prefabricated building, with control cables linking the two buildings. The auxiliary equipment for the photographic recorders as well as that for the AMOS Mk I was moved from the prefabricated building to the office building in June, 1976. A permanent building for the absolute instruments was completed in September 1961, located about 30 m north of the variometer and control buildings. A three-component Ruska magnetograph was installed in September 1969. Prior to this date a portable Askania-Werke earth magnetic variograph had been the primary photographic recorder. The Ruska magnetograph ceased operation and was removed from the Observatory in April, 1985. In addition, the GSI precise magnetometer made by Sokkisha (Japan) was replaced by a D measuring fluxgate theodolite (of Earth Physics Branch design) as the primary instrument for the absolute determination of Declination and Inclination . Digital recordings were begun in June, 1971 with the installation of the Earth Physics Branch's AMOS Mk I. The AMOS Mk I became the primary recorder for Victoria Observatory in June, 1976. The AMOS Mk I was replaced by the AMOS Mk III in April, 1985. In turn, the AMOS Mk III was itself replaced by the CANMOS in March, 1992. The CANMOS is the present primary instrumentation at Victoria Geomagnetic Observatory.
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: 197 meters
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1956
Ending_Date:Present
Currentness_Reference:
ground condition
Status:
Progress:In work
Maintenance_and_Update_Frequency:Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-123.42
East_Bounding_Coordinate:-123.42
North_Bounding_Coordinate:48.52
South_Bounding_Coordinate:48.52
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:Geological Survey of Canada
Contact_Person:L. McKee
Contact_Address:
Address_Type:mailing
Address:
7-Observatory Crescent
Address:
City:Ottawa
State_or_Province:Ontario
Postal_Code:K1A 0Y3
Country:Canada
Contact_Voice_Telephone:613-837-9158
Contact_Facsimile_Telephone:613-824-9803
Contact_Electronic_Mail_Address:lmckee@NRCan.gc.ca
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data from the Victoria Magnetic Observatory 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:Full field
Attribute_Accuracy_Explanation:
Dynamic Range
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:0.025 nT
Attribute_Accuracy_Explanation:
Resolution
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:8 Hz reduced by a boxcar filter to 1 second data; 1 second data reduced to 5 second data
Attribute_Accuracy_Explanation:
Sampling Rate
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:9 point Guassian filter; INTERMAGNET 19 point Gaussian filter for the production of 1 minute data from 5 second data
Attribute_Accuracy_Explanation:
Numeric Filter
Logical_Consistency_Report:
Contact institution
Completeness_Report:
These data represent the complete record set for this station and this time period.
Lineage:
Process_Step:
Process_Description:
Contact institute
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:David Fischman
Contact_Position:Data Manager
Contact_Address:
Address_Type:mailing and physical
Address:
325 Broadway
City:Boulder
State_or_Province:CO
Postal_Code:80303
Country:USA
Contact_Voice_Telephone:303 497-4654
Contact_Facsimile_Telephone:303-497-6513
Contact_Electronic_Mail_Address:david.fischman@noaa.gov
Hours_of_Service:8:00 - 5:00 Mountain
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: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:
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:David Fischman
Contact_Position:Data Manager
Contact_Address:
Address_Type:mailing and physical
Address:
325 Broadway
City:Boulder
State_or_Province:CO
Postal_Code:80303
Country:USA
Contact_Voice_Telephone:303 497-4654
Contact_Facsimile_Telephone:303-497-6513
Contact_Electronic_Mail_Address:david.fischman@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:2008-09-23T07:54:11
Author:Kokovin Dmitry
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