2.2.2 spase://VMO/NumericalData/WDC/Trivandrum.2/Magnetometer/PT1H/WDC_FORMAT Trivandrum 2 Magnetometer 1-hr Data in WDC Format 2012-05-02T12:34:56.789 Trivandrum 2 Magnetometer data, 1-hr time resoluion, in WDC format. Magnetic Field Vector Element List: DHZ. 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: Indian Institute of Geomagnetism, Bombay 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/Sobhana.Alex 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/Trivandrum/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/Trivandrum.2/Magnetometer MagneticField 1957-10-01T00:00:00.000 1999-09-30T23:00:00.000 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 Trivandrum 2 WDC Station Code: TRD 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 Trivandrum 2 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 Trivandrum 2 Horzontal Magnetic Field Magnitude PT1H nT 10^9 >T Cylindrical CGM 0 70000 9999 Projection.IJ Magnetic Vertical Magnetic Field Component Z Trivandrum 2 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 TRD 1957 H TRD 1958 D H Z TRD 1959 D H Z TRD 1960 D H Z TRD 1961 D H Z TRD 1962 D H Z TRD 1963 D H Z TRD 1964 D H Z TRD 1965 D H Z TRD 1966 D H Z TRD 1967 D H Z TRD 1968 D H Z TRD 1969 D H Z TRD 1971 D H Z TRD 1972 D H Z TRD 1973 D H Z TRD 1974 D H Z TRD 1975 D H Z TRD 1976 D H Z TRD 1977 D H Z TRD 1978 D H Z TRD 1979 D H Z TRD 1980 D H Z TRD 1981 D H Z TRD 1982 D H Z TRD 1983 D H Z TRD 1984 D H Z TRD 1985 D H Z TRD 1986 D H Z TRD 1987 D H Z TRD 1988 D H Z TRD 1989 D H Z TRD 1990 D H Z TRD 1991 D H Z TRD 1992 D H Z TRD 1993 D H Z TRD 1994 D H Z TRD 1995 D H Z TRD 1996 D H Z TRD 1997 D H Z TRD 1998 D H Z TRD 1999 D H Z 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