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Iqaluit Magnetic Observatory

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


Identification_Information:
Citation:
Citation_Information:
Originator:Geological Survey of Canadar
Publication_Date:1994
Title:
Iqaluit Magnetic Observatory
Online_Linkage:http://gsc.nrcan.gc.ca/geomag/index_e.php
Description:
Abstract:
Consideration was given to building a magnetic observatory in Iqaluit in the middle of 1988. However, it was not until August, 1990 that discussions were held with officials from Arctic College, Nunatta Campus, as to establishing an observatory as a joint project. In preparation for the construction, the Municipality of Iqaluit granted in December, 1990, rights to a parcel of land to the Geological Survey of Canada (GSC) for recording the variations in the geomagnetic field. Towards the end of March, 1994 a formal Memorandum of Understanding was signed by the GSC and the Arctic College towards the establishment of a magnetic observatory in Iqaluit. The Understanding committed the GSC to bear the cost of the material and the Arctic College to providing the labor for the construction. The site chosen for the new observatory is on the side of a hill, 1.4 km to the north from the centre of Iqaluit and 400 m to north of the Arctic College. The area has significant exposures of Archaean gneiss. Unfortunately, a preliminary Total Force survey of the site showed that F variations could be as high as 1400 nT over 30 m. This amount of magnetic relief is prevalent in Iqaluit. Apprentice carpenters from the Arctic College completed the construction of an Absolute Building ( 4.8 m by 2.4 m by 2.4 m), the Service Building ( 4.8 m by 3.6 m by 2.4 m) and the various sensor shelters during the summer of 1994. The two buildings and the sensor shelters are scattered over the site in the same fashion as that for other Canadian observatories such as Yellowknife. The Observatory was furnished with an NTERMAGNET compliant CANMOS in October, 1994. However, various instrumental and operational difficulties precluded the routine collection of data until January, 1995. During 1995 it became apparent that problems existed within the data as the difference between the calculated F from the fluxgate and the measured F from the total force magnetometer varied. This was especially noticeable during periods of magnetic disturbances. The problem persisted even though the various magnetometers were replaced during 1995. A re-examination of the earlier F survey showed that the F sensor and the 3-component fluxgate sensor were situated on either side of a substantial F anomaly. It was therefore decided to move the sensors to an area of lower magnetic relief. This was done in August, 1996 and resulted in a substantial reduction in the problem. CANMOS (Canadian Magnetic Observatory System) has been designed by the GSC Geomagnetism Program staff, who have developed the software to control the magnetometers and to process the basic digital data. CANMOS includes: - a commercial tri-axial ringcore fluxgate magnetometer, mounted on a tilt correcting suspension (of GSC design); - an Overhauser Proton Precession Magnetometer; - a bus-clock for timing control; - various storage media; - RS-232 outputs for 1 second, 5 second and 1 minute data streams. During 2005 the municipality established a new subdivision at the location of the original observatory site. The rights to a new parcel of land were granted and funding contributed to the relocation of the observatory. Staff from the GSC magnetically surveyed several locations and settled on a site approximately 500m up the hill from the former observatory. The geology is similar to the former site and the buildings were situated to minimize magnetic differences between the sensor enclosures. Unfortunately, there was no opportunity to continue the operation of the original observatory beyond the beginning of July 2005 as construction of the subdivision infrastructure had already begun. All instrumentation has been kept the same. GSC staff completed the construction of the new sensor enclosures in October 2005. The service building and the absolute building were transported from the previous observatory location. The new enclosures are modular sensor vaults constructed of fiberglass and cement.
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: 100 meters
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1994
Ending_Date:Present
Currentness_Reference:
ground condition
Status:
Progress:In work
Maintenance_and_Update_Frequency:Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-68.51
East_Bounding_Coordinate:-68.51
North_Bounding_Coordinate:63.76
South_Bounding_Coordinate:63.76
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:Unknown
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 Iqaluit 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 1second data; 1 second data reduced to 5 second data by use of a 9 point Gaussian filter; INTERMAGNET 19 point Gaussian filter for the production of 1 minute data from 5 second data
Attribute_Accuracy_Explanation:
Sampling Rate
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:9 point Gaussian and 19 point Gaussian
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:2008-09-23T07:53:07
Author:Kokovin Dmitry
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