2.2.2 spase://VMO/NumericalData/WDC/Antananarivo/Magnetometer/PT1H/WDC_FORMAT Antananarivo Magnetometer 1-hr Data in WDC Format 2012-05-02T12:34:56.789 Antananarivo Magnetometer data, 1-hr time resoluion, in WDC format. Magnetic Field Vector Element List: DHXYZF. Note that the list of magnetic field elements that appear in the data set may change over the course of time. For instance, many stations have shifted from DHZ to the XYZ representation of the magnetic field. The time history listed below summarizes changes in element content. A description of the WDC Data Exchange Format for 1-hr magnetic field data is included at the end of this data product description. Please acknowledge: Institut et Observatoire Geophysique d'Antananarivo (IOGA) for providing the data observations, and the British Geological Survey, World Data Center for Geomagnetism, Edinburgh for providing access to the data. spase://SMWG/Person/Aude.Chambodut GeneralContact DataProducer spase://SMWG/Person/Armelle.Bernard GeneralContact DataProducer spase://SMWG/Person/Ranaivo-Nomenjanahary GeneralContact DataProducer spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact TechnicalContact The Geomagnetic Data Master Catalog at the WDC for Geomagnetism, Edinburgh http://www.wdc.bgs.ac.uk/catalog/intro.html Web site for access to magnetometer data hosted by the World Data Center for Geomagnetism, Edinburgh spase://VMO/NumericalData/WDC/Antananarivo/Magnetometer/PT1H spase://SMWG/Repository/UCLA/VMO Online Open The WDC Geomagnetic Data Master Catalog Repository ftp://ftp.nmh.ac.uk/wdc/obsdata/hourval/single_year The Geomagnetic Data Master Catalog hosted by the British Geological Survey, World Data Center for Geomagnetism, Edinburgh. Text ASCII 311710 bytes P1Y Please thank the British Geological Survey, World Data Center, Edinburgh for use of data from the WDC Geomagnetic Data Master Catalog. Calibrated spase://SMWG/Instrument/Ground/Antananarivo/Magnetometer MagneticField 1957-07-01T00:00:00.000 2007-12-31T23:00:00.000 Some data gaps may be present. If a gap is present at the beginning or end of the file, the time span start and stop dates could be inaccurate as they are assigned assuming an absence of such gaps. PT1H Earth.Surface ground station magnetometer magnetic field magnetogram Antananarivo WDC Station Code: TAN 1-hour WDC Format Universal Time Time Time is expressed using a five column format with the following order: year, month, day, hour, and minute, each stored in interger format. The time columns are the first five columns (1,2,3,4,5) in the flat file. PT1H 5 Universal Time expressed using a 5-column year, month, day, hour, minute representation Year 1 Month 2 Day 3 Hour 4 Minute 5 Temporal Magnetic Field Declination D Antananarivo Magnetic Field Vector Declination Angle PT1H Degree 2*pi > Radian Cylindrical CGM -180.0 180.0 9999 DirectionAngle.AzimuthAngle Magnetic Horzontal Magnetic Field Magnitude H Antananarivo Horzontal Magnetic Field Magnitude PT1H nT 10^9 >T Cylindrical CGM 0 70000 9999 Projection.IJ Magnetic North-South Horizontal Magnetic Field Component X Antananarivo North-South Horizontal Magnetic Field Component, positive Northward PT1H nT 10^9 >T Cartesian CGM -70000 70000 9999 Component.I Magnetic East-West Horizontal Magnetic Field Component Y Antananarivo East-West Horizontal Magnetic Field Component, positive Eastward PT1H nT 10^9 >T Cartesian CGM -70000 70000 9999 Component.J Magnetic Vertical Magnetic Field Component Z Antananarivo Vertical Magnetic Field Component, positive upward in the Southern hemisphere, positive downward in the Northern hemisphere PT1H nT 10^9 >T Cartesian CGM -70000 70000 9999 Component.K Magnetic Magnetic Field Magnitude F Antananarivo Magnetic Field Magnitude PT1H nT 10^9 >T 0 70000 9999 Magnitude Magnetic TAN 1957 D H Z TAN 1958 D H Z TAN 1959 D H Z TAN 1962 D H Z TAN 1963 D H Z TAN 1964 D H Z TAN 1965 D H Z TAN 1966 D H Z TAN 1967 D H Z TAN 1968 D H Z TAN 1969 D H Z TAN 1970 D H Z TAN 1971 D H Z TAN 1972 D H Z TAN 1973 D H Z TAN 1974 D H Z TAN 1975 D H Z TAN 1976 D H Z TAN 1983 D H Z F TAN 1984 D H Z F TAN 1985 D H Z F TAN 1986 D H Z F TAN 1987 D H Z F TAN 1988 D H Z F TAN 1989 D H Z F TAN 1990 D H Z F TAN 1991 D H Z F TAN 1992 D H Z F TAN 1993 X Y Z F TAN 1994 X Y Z F TAN 1995 X Y Z F TAN 1996 X Y Z F TAN 1997 X Y Z F TAN 1998 X Y Z F TAN 1999 X Y Z F TAN 2000 X Y Z F TAN 2001 X Y Z F TAN 2002 X Y Z F TAN 2003 X Y Z F TAN 2004 X Y Z F TAN 2005 X Y Z F TAN 2006 X Y Z F TAN 2007 X Y Z F Digital WDC Exchange Format for Observatory Hourly Mean Values -------------------------------------------------------------- Magnetic data organized in 1-year files, with the information coded in ASCII Columns Format Description 1-3 A3 Observatory 3-letter code 4-5 I2 Year Last 2 digits, 1996 = 96. See also columns 15-16. 6-7 I2 Month (01-12) 8 Al Element (D, I, H, X, Y, Z, or F) 9-10 I2 Day of month (01-31) 11-12 A2 Blanks 13 A1 Arbitrary 14 A1 Arbitrary +-- Old Format: -------------------------+ 15-16 I2 Century digits Column 15: International Quiet or Year = 1889, Century digits = 18. Disturbed Days Q=1, D=2 Year = 1996, Century digits = 19. Column 16: Blank for data since 1900, Year = 2014, Century digits = 20. 8 for data before 1900. +----------------------------------------+ 17-20 I4 Tabular base The values are in degrees for D and I, and in hundreds of nanoTeslas for the intensity elements. 21-116 24I4 24 4-digit hourly mean values for the day. The values are in tenth-minutes for D and I, and in nanoTeslas for the intensity elements. The first hourly mean value represents the mean value between 00:00 UT and 01:00 UT, ..., the 24th value represents the mean between 23:00 UT and 24:00 UT. A missing value is identified by 9999. 117-120 I4 Daily Mean If any of the hourly mean values for the day are missing 9999 will appear as the daily mean. 121-122 Record end marker Two chars "cr"= 13 and "nl"= 10. The tabular bases, hourly mean values and daily means are right adjusted and signed if negative. Negative values are identified with a minus sign either adjacent to the first significant digit or in the high-order position of the field. Note: A blank digit will not appear between a (-) sign and the first significant digit. For example, a value may appear as -050 or b-50 but not as -b50 (b=blank). The 25 values in positions 21-120 will have the range -999 to 9998, with 9999 reserved for missing values. The records are sorted according to observatory code, year, month, element, day (positions 1-10). For the intensity elements: hourly value (nanoTeslas) = tab.base*100 + tab.value For the angles D and I: hourly value (Degrees) = tab.base + tab.value/600