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Alice Springs Magnetic Observatory

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


Identification_Information:
Citation:
Citation_Information:
Originator:Geoscience Australia (GA)
Publication_Date:1992
Title:
Alice Springs Magnetic Observatory
Online_Linkage:http://www.ga.gov.au
Description:
Abstract:
The earliest vector magnetic observation at Alice Springs was probably made by the Carnegie Institution of Washington (CIW) in 1912 when the declination, inclination and horizontal intensity were measured at a location in the vicinity of the Alice Springs telegraph station just north of the town of Alice Springs. The location of that observing site has since been designated as magnetic station A. The declination was also measured at a nearby secondary station, later named A1. The exact location of A1 was not occupied again, but a close reoccupation was made in 1937 at a station referred to as A2. The next occupation occurred in 1945 when an exact reoccupation of station A2 from 1937 was made and a new station, B, was established. By the time of the next occupation, in 1954, the old telegraph station had been converted to a 'native mission site' and the buildings used in the original station descriptions were no longer identifiable. The azimuth marks described from the 1945 occupation could not be located, although the 1945 station marker (a peg) was located, but it had been torn out of the ground during road making operations. The general area of the stations had become magnetically contaminated by a barbed wire fence so the decision was taken to establish a new station at an alternate location. Two sites for a magnetic station were chosen, one at the airfield and one at the Department of Civil Aviation (DCA) transmission site. At the time, the station at the airfield was considered the better of the two, but fears of future magnetic contamination of the station were held. The station at the airfield was called C and that at the DCA transmitter site called station D. Both stations were marked with a concrete peg set one inch above ground level. Stations C and D were reoccupied in 1961, 1962, 1966 and 1969. In 1969 a new station was established at the airfield and designated station E. Station E was reoccupied in 1973, 1976, 1978 and 1983 (together with observations on station C). A secondary station was established close to station E in April 1983 by surveyors from the Australian Survey Office. The secondary station was designated as station F. Stations C, E and F were occupied in 1986 and 1992. Stations E and F were occupied in 2001, 2004 and again in 2005. Planning for the construction of the Alice Springs observatory was underway by 1984. After negotiations with the CSIRO Division of Wildlife and Range Lands Research, it was agreed that a magnetic observatory comprising two small underground vaults, a small building for control equipment, an observation pier with shelter and two azimuth pillars, could be constructed on the compound at their Central Australian Laboratory just south of the town of Alice Springs. The observatory was constructed in two stages. The first stage, comprising two small vaults and an absolute shelter, was completed in April 1988. The second stage, comprising the recording house and two azimuth reference pillars, was completed in June 1989. Electrical fixtures included in the recording house were an airconditioner, 2 x 40 watt fluorescent lights, two pairs of standard electrical outlets on each internal wall and provision for two telephone lines. The two azimuth piers were enclosed in cattle-proof fences. The position of the absolute pier and the azimuths from the absolute pier to the two reference pillars was surveyed in March 1990. The variometer and recording equipment were installed at the observatory in May 1992 and continuous recording of the magnetic field commenced on 01 June 1992.
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: 557 metres
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:1992
Ending_Date:Present
Currentness_Reference:
ground condition
Status:
Progress:In work
Maintenance_and_Update_Frequency:Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:133.88
East_Bounding_Coordinate:133.88
North_Bounding_Coordinate:-23.76
South_Bounding_Coordinate:-23.76
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:Geoscience Australia
Contact_Person:Contact institute
Contact_Address:
Address_Type:mailing
Address:
Geomagnetism Project
Address:
G.P.O. Box 378
City:Canberra
State_or_Province:A.C.T.
Postal_Code:2601
Country:Australia
Contact_Voice_Telephone:+ 61-2-6249-9111
Contact_Facsimile_Telephone:+ 61-2-6249-9986
Contact_Electronic_Mail_Address:geomag@ga.gov.au
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data from the Alice Springs 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:+/- 1600 nT
Attribute_Accuracy_Explanation:
Dynamic Range
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:RCF magnetometer: 0.025 nT; DMI magnetometer: 0.032 nT
Attribute_Accuracy_Explanation:
Resolution
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:1second and 1 Minute
Attribute_Accuracy_Explanation:
Sampling Rate
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value:Mean values
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:20080717
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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