January 4, 2008 Space Weather Prediction Center (SWPC) Geomagnetic Data Lists This directory contains two geomagnetic data lists: o A and K indices for ground-based magnetometer stations received at SWPC. There are three lists; Last 2 days of A and K indices, Last 7 days of A and K indices, and monthly lists. The 2- and 7- lists contain the 8 stations that report in near-real-time, they update every hour. The monthly lists contain all stations received at SWPC, they are updated once a day and begin on the 8th of the month. Station are ordered alphabetically. "-1" denotes missing values. SWPC compiles the A and K-indices lists from preliminary data provided by the contributing stations. Errors and invalid indices are possible. Final values and older values are available at thd Solar Terrestrial Physics site at the National Geophysical Data Center http://www.ngdc.noaa.gov/stp/ o 1-minute magnetometer component values from the primary and secondary SWPC GOES satellites. See desription below. All files update every minute. Files with no date in the filename contain data for the last 2-hours. Users retrieving data frequently are asked to use these files. The daily files are named with the UT day of the data and the GOES satellite, i.e G12 refers to GOES 12. The file format follows the SWPC standard data list conventions where header lines start with either # or :. Date/times Dates are shown as year month day (2006 02 06) and a Modified Julian Day (MJD). The MJD for Jan 1, 2004 is 53005 Time is shown as HourMin (1900) and seconds of the day (68400) GOES data are archived at the National Geophysical Data Center http://www.ngdc.noaa.gov/stp ****************************************************************** ** Please read the SWPC Disclaimer at http://www.swpc.noaa.gov/ ** ****************************************************************** SWPC provides near-real-time and recent data, solar and geomagnetic indices and solar event reports created from preliminary reports. Preliminary data may contain errors or be revised after further review. The historical products in this SWPC Warehouse are the preliminary reports as originally published. SWPC does not encourage the use of preliminary data for research purposes. Links to on-line data at SWPC and archive sites with final data: http://www.swpc.noaa.gov/Data/ ****************************************************************** Please send comments and questions to SWPC.Webmaster@noaa.gov Report problems to SWPC.CustomerSupport@noaa.gov ======================================================================= ======================================================================= ************************************************ Sample Geomagnetic A and K Indices List Product ************************************************ :Product: Geomagnetic Data 200712AK.txt :Issued: 1636 UTC 04 Jan 2008 # # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Please send comments and suggestions to SWPC.Webmaster@noaa.gov # Updated daily. Values are shown as reported, SEC does not verify accuracy. # Missing Data: -1 # # Geomagnetic A and K indices from the U.S. Geological Survey Stations # # Geomagnetic # Dipole A ------------- 3 Hourly K Indices -------------- # Station Lat Long Index 00-03 03-06 06-09 09-12 12-15 15-18 18-21 21-24 #------------------------------------------------------------------------------- 2007 Dec 1 Beijing N29 W174 -1 -1 -1 -1 -1 -1 -1 -1 -1 Belsk N69 E 40 6 3 1 1 2 2 1 1 1 Boulder N49 W 42 2 2 0 1 1 1 1 0 1 Cape Chelyuskin N66 E177 -1 -1 -1 -1 -1 -1 -1 -1 -1 Chambon-la-foret N-- E--- 7 -1 -1 0 1 0 0 0 0 College N65 W102 3 1 0 2 3 0 0 0 0 Dixon Island N63 E162 -1 -1 -1 -1 -1 -1 -1 -1 -1 Fredericksburg N38 W 78 2 2 0 1 1 0 0 0 0 Gottingen(provisional Ap) -1 -1 -1 -1 -1 -1 -1 -1 -1 Kergulen Island S57 E130 -1 -1 -1 -1 -1 -1 -1 -1 -1 Krenkel N71 E156 104 4 4 3 3 2 1 1 2 Learmonth S22 E114 -1 -1 -1 -1 -1 -1 -1 -1 -1 St. Petersburg N56 E118 3 1 1 1 1 1 1 1 1 Magadan N51 W148 4 2 1 1 2 0 0 0 3 Moscow N51 E122 5 2 2 1 2 1 1 1 2 Murmansk N63 E127 4 3 1 1 0 2 0 0 1 Novosibirsk N45 E159 2 2 0 1 1 0 0 0 0 P. Tunguska N51 E165 2 0 1 1 1 1 0 1 1 Petropavlovsk N45 W140 -1 -1 -1 -1 -1 -1 -1 -1 -1 Planetary(estimated Ap) 2 2 0 1 1 0 0 0 0 Tiksi Bay N61 W168 -1 -1 -1 -1 -1 -1 -1 -1 -1 Wingst N54 E 95 3 3 1 1 1 0 0 0 1 2007 Dec 2 Beijing N29 W174 -1 -1 -1 -1 -1 -1 -1 -1 -1 Belsk N69 E 40 6 1 2 2 2 2 2 2 1 Boulder N49 W 42 1 0 1 1 0 0 1 1 1 Cape Chelyuskin N66 E177 -1 -1 -1 -1 -1 -1 -1 -1 -1 Chambon-la-foret N-- E--- -1 0 0 -1 -1 -1 -1 -1 -1 College N65 W102 0 0 0 0 0 0 0 0 0 Dixon Island N63 E162 -1 -1 -1 -1 -1 -1 -1 -1 -1 Fredericksburg N38 W 78 2 0 1 1 0 0 1 0 1 Gottingen(provisional Ap) -1 -1 -1 -1 -1 -1 -1 -1 -1 Kergulen Island S57 E130 -1 -1 -1 -1 -1 -1 -1 -1 -1 Krenkel N71 E156 92 3 3 3 2 1 2 3 3 Learmonth S22 E114 -1 -1 -1 -1 -1 -1 -1 -1 -1 St. Petersburg N56 E118 3 1 1 1 1 1 1 1 1 Magadan N51 W148 2 0 1 1 1 1 1 0 0 Moscow N51 E122 5 1 1 2 2 2 1 1 1 Murmansk N63 E127 3 1 0 1 1 1 2 1 1 Novosibirsk N45 E159 1 0 1 1 0 0 0 0 0 P. Tunguska N51 E165 5 1 2 1 1 1 2 2 1 Petropavlovsk N45 W140 -1 -1 -1 -1 -1 -1 -1 -1 -1 Planetary(estimated Ap) 2 0 1 0 0 0 0 0 1 Tiksi Bay N61 W168 -1 -1 -1 -1 -1 -1 -1 -1 -1 Wingst N54 E 95 -1 -1 -1 -1 -1 -1 -1 -1 -1 ************************************************ Sample GOES Magnetometer List -- See GOES magnetometer data description below ************************************************ :Data_list: G12mag_1m.txt :Created: 2008 Jan 04 1647 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # Please send comments and suggestions to SWPC.Webmaster@noaa.gov # # Label: Hp component = perpendicular to the satellite orbital plane or # parallel to the Earth's spin axis # Label: He component = perpendicular to Hp and directed earthwards # Label: Hn component = perpendicular to both Hp and He, directed eastwards # Label: Total Field = # Units: nanotesla (nT) # Source: GOES-12 # Location: W075 # Missing data: -1.00e+05 # # 1-minute GOES-12 Geomagnetic Components and Total Field # # Modified Seconds # UTC Date Time Julian of the # YR MO DA HHMM Day Day Hp He Hn Total Field #------------------------------------------------------------------------------- 2008 01 04 1447 54469 53220 1.18e+02 3.12e+01 3.29e+00 1.22e+02 2008 01 04 1448 54469 53280 1.18e+02 3.01e+01 3.10e+00 1.22e+02 2008 01 04 1449 54469 53340 1.19e+02 3.06e+01 4.60e+00 1.23e+02 2008 01 04 1450 54469 53400 1.21e+02 2.93e+01 3.70e+00 1.24e+02 2008 01 04 1451 54469 53460 1.21e+02 2.84e+01 5.62e+00 1.25e+02 2008 01 04 1452 54469 53520 1.21e+02 2.79e+01 4.14e+00 1.24e+02 2008 01 04 1453 54469 53580 1.24e+02 2.80e+01 4.19e+00 1.27e+02 2008 01 04 1454 54469 53640 1.24e+02 2.81e+01 4.13e+00 1.27e+02 2008 01 04 1455 54469 53700 1.26e+02 2.79e+01 4.50e+00 1.29e+02 2008 01 04 1456 54469 53760 1.25e+02 2.70e+01 4.69e+00 1.28e+02 2008 01 04 1457 54469 53820 1.27e+02 2.78e+01 4.55e+00 1.30e+02 2008 01 04 1458 54469 53880 1.26e+02 2.68e+01 4.94e+00 1.29e+02 2008 01 04 1459 54469 53940 1.26e+02 2.64e+01 5.43e+00 1.29e+02 ... ================================================================================ ================================================================================ DESCRIPTION OF GOES MAGNETOMETER DATA September 1996 SWPC designates two GOES satellites as operational, one at about 135 degrees geographic west longitude and one at about 75 degrees geographic west longitude. The satellite inclination is typically within a few tenths of a degree of of the geographic equator. However, the satellites can be moved, especially during the six months to one year following launch, and the inclination can increase after years of satellite operation. The following information is provided as an aid for interpreting and using magnetometer data from GOES satellites. 1. Coordinate system: The three components are: Hp, perpendicular to the satellite orbital plane or parallel to the Earth's spin axis in the case of a zero degree inclination orbit; He, perpendicular to Hp and directed earthwards; and Hn, perpendicular to both Hp and He and directed eastwards. (This is the same coordinate system used for all the GOES magnetic field measurements since GOES-5; prior to GOES-5, Hn was directed westwards.) 2. Effect of three-axis stabilized, rather than spinning spacecraft: Calibration data are used from ground and on-orbit testing, including a one-time 3-axis spacecraft maneuver to determine offsets resulting from the spacecraft field and magnetometer electronics. However, it is important to remember that absolute vector magnetic field measurements are difficult to determine on non-spinning spacecraft such as GOES 8 and 9. We will continue to evaluate the data, including comparisons with model fields, and provide improved knowledge of magnetic field absolute accuracy as it becomes known. 3. Torquer current effects: A calibration between torquer currents and magnetic field signatures was made both on the ground and in space for correcting the magnetic field measurement; however, on GOES-8, noise in the torquer current telemetry introduced artificial noise in the "corrected" magnetic field at the few nanoTesla level. A correction has been instituted on GOES-8, and will be included on following spacecraft, to allow use of torquer command data for torquer current correction. The problem has been further dealt with on GOES-9, and future spacecraft, by filtering the torquer current telemetry before it is transmitted. These effects should be insignificant in the vast majority of the 1-minute data. 4.GOES 9 eclipse intervals: GOES-9 is undergoing few degree rotations during the eclipse seasons for spacecraft thermal control to extend the life of motors used for the imager and sounder. The first tests were on August 14, 1996, and then rotations were performed routinely from August 20, 1996 to September 1, 1996. These rotations will be performed again from October 13, 1996 to October 26, 1996. The schedule may be cancelled during severe weather monitoring intervals. The spacecraft, including magnetometer sensors, is rotated 3.5 degrees to the east about four hours before local midnight. At local midnight, the spacecraft is rotated to face four degrees west from the usual orientation. Approximately four hours later, the spacecraft orientation is returned to normal. For example, on August 14, the first maneuver was about 0430 UT, the second at 0840 UT and the final rotaion at 1302 UT. At present, there is no correction applied to the magnetometer data, but the correction should be present by the spring eclipse season. 5. Calibrations: Calibrations are performed once per week and will result in a few minutes of deleted 1 minute average data. 6. Reference: Singer, H.J., L. Matheson, R. Grubb, A. Newman and S.D. Bouwer, Monitoring Space Weather with the GOES Magnetometers, SPIE Conference Proceedings, Volume 2812, 4-9 August 1996, in press. Contacts: Dr. Howard.Singer@noaa.gov Lead Scientist for GOES SEM Instruments Dr. Terry.Onsager@noaa.gov Energetic Particles Dr. Howard.Singer@noaa.gov Magnetometer ========================================================================= ========================================================================= ========================================================================= OLD NOTICES ========================================================================= May 15, 2003 Space Environment Center GOES MAGNETOMETER Data Lists ====================================================================== May 15, 2003 -- The GOES 10 energetic proton detectors are showing intermittent, high noise levels in the higher energy proton channels (greater than about 80 MeV). This problem was first noticed in data taken April 26, 2003. To ensure continued operational monitoring of important energetic particle data, it is necessary to reassign primary/secondary designations for the GOES Space Environment Monitor (SEM) detectors. As of 1500 UT on May 15, GOES-8 became the primary satellite for protons. GOES 12 is the primary satellite for magnetometer, X-ray, and electron measurements. GOES 10 is the secondary satellite for all SEM sensors - magnetometer, X-ray sensor, and energetic particle sensor. This short-term solution (approximately 2 - 3 months) will be in place until we define and implement a permanent fix. See details at http://www.swpc.noaa.gov/GOES.html ====================================================================== April 8, SWPC stopped using GOES 8 data. GOES 10 is now SWPC's primary GOES satellite, with GOES 12 the backup for magnetometer, XRS x-ray measurements, and energetic particle data. However, no integral particle and electron flux values are available on GOES 12. =========================================================================== ===========================================================================