******************************************************************************* ***** ***** ***** README file for one-minute magnetic field database ***** ***** of the 210 (deg) meridian chain ***** ***** ***** ***** February 20, 1996, written by K. Shiokawa and K. Yumoto ***** ***** ***** ***** contact address : ***** ***** Solar-Terrestrial Environment Laboratory, Nagoya University ***** ***** Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan ***** ***** tel: +81-52-747-6419 fax: +81-52-747-6323 ***** ***** E-mail: shiokawa @ stelab.nagoya-u.ac.jp ***** ***** ***** ******************************************************************************* Thank you for your interest in the 210 (deg) MM (magnetic meridian) magnetic field data !!! This is the README file for 1-min value data file. Please read this file carefully before using the data base. ----- 1. Data Use ------------------------------------------------------------ 1) Please contact Prof. K. Yumoto (Principal Investigator) before using the data at any presentation or publication. The contact address of Prof. K. Yumoto is Prof. K. Yumoto Space Environment Research Center Kyushu University 53 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. tel:092-642-2673 fax:092-642-2685 e-mail: yumoto @ serc.kyushu-u.ac.jp; 2) In case of publication, please acknowledge the Solar-Terrestrial Environment Laboratory, Nagoya University for managing the database of the 210 MM magnetic observations. ----- 2. File Format ---------------------------------------------------------- Each one data file corresponds to the data from one station during one day. The data are located under the directory of each year and each station. For example, the data obtained at the Mosiri Observatory, are in the directory of /1991/msr. File name is as follows. File_Name: A5yymmdd.stn yy: year mm: month dd: day stn: station name For example, the data file obtained at Mosiri on December 8, 1991, is named as A5911208.msr. Data format inside files is basically the same as that of WDC-A tape exchange format, where there are no absolute values of magnetic field, that is, block_structure/1hour (400character) NPD|LONG|YR |MO |DA |E |HR |OBS |ORG|BLANKS|DATA-1|..|DATA-60|HR_MEAN| 1-6|7-12|13-14|15-16|17-18|19|20-21|22-24|25 |26-34 |35-40 |..|389-394|395-400| file_structure |..E=X(H-component)..HR=0..|.. ..|..E=X(H)..HR=23..| (400+1)x24=9624character |..E=Y(D-component)..HR=0..|.. ..|..E=Y(D)..HR=23..| (400+1)x24=9624character |..E=Z(Z-component)..HR=0..|.. ..|..E=Z(Z)..HR=23..| (400+1)x24=9624character (+1 Byte is CR) total file size =401x24x3=28872 byte/1day (1 character= 1 Byte). Data are in ASCII format. *NPD is the observatory's North Polar Distance (0 deg to 180 deg) from the north geographic pole in thousandths of a degree and is allotted 6 characters. Decimal point is implied between positions 3 and 4. *Long is the geographic longitude (0 deg to 360 deg) measured EAST from Greenwich in thousandths of a degree and also has a 6 character field. Decimal point is implied between positions 9 and 10. *YR, MO, DA, and HR are each 2-digit numbers giving the data and GMT. *E is the element symbol (H, D, and Z) in 1 character. For the data copied before July 5, 2010, it may be X, Y, or Z. In that case, X is H-component and Y is D-component. *OBS is the 3 letter abbreviation for the observatory. *ORG is origin of data. In this data base, ORG is blank. *BLANKS are 9 character spaces reserved for future additions. Now, it is filled by '0.1nT ', which indicates unit of the data. *DATA-1...-60 are one-minute values of the given element. Unit is 0.1 nT. These data are obtained by averaging sixty 1-sec sampled data. For example, one-min data at 00h01mUT is an average of 00h00m30s-00h01m29sUT. As an exception, one-min data at 00h00mUT is an average of 00h00m00s-00h00m29sUT. *HR MEAN is the average of the preceeding 60 one-minute values in unit of 0.1 nT. *Each element value and the hourly mean are given in a six-digit field including a minus sign for negative values or blank for positive values. *This one-min database was re-made from one second data on July 5, 2010 to correct the element symbol E (X,Y,Z-->H,D,Z) and to consistently calculate 1-min average. The data copied before July 5, 2010 may contain mixture of one-min average and one-min sampled data. The abbreviations of stations are as follows. Table 1. Station Names, Geographic and Geomagnetic Coordinates, and L Values of Observation Sites. ----------------------------------------------------------------------------- Geographic Geomagnetic+ Station Name* Coordinates Coordinates Abbrevi- ----------- ------------ L+ Associ. Date of ation Lat, Long, Lat, Long, Inst.\ Onset deg deg deg deg ----------------------------------------------------------------------------- Tixie (TIX)TIK 71.59 128.78 65.67 196.88 5.89 IKFIA,IFZ 92/8- Zhigansk ZGN 66.75 123.26 61.01 193.82 4.25 IKFIA 95/ - Yakutsk YAK 62.02 129.72 56.08 200.51 3.21 IKFIA Irkutsk IRT 52.17 104.45 47.13 177.01 2.16 ISTP Popov Island PPI 42.98 131.73 36.62 203.63 1.55 POI 95/ - Beijing BJI 40.06 116.18 34.37 188.40 1.47 IGCAS Lunping LNP 25.00 121.17 13.80 189.50 1.06 NCU, LNP 94/1- Muntinlupa MUT 14.37 121.02 3.58 191.57 1.00 CGSD 93/7- Pontianak PTN -0.05 109.25 -11.37 180.49 1.04 LAPAN Watukosek WTK -7.56 112.63 -18.52 183.85 1.11 LAPAN Learmonth (LEM)LMT -22.22 114.10 -34.15 185.02 1.46 IPS, UNC 91/8- Katanning KAT -33.68 117.62 -46.63 188.24 2.12 GSARI, UNC 95/8- ----------------------------------------------------------------------------- Kotel'nyy KTN 75.94 137.71 69.94 201.02 8.50 IKFIA 94/10- Chokurdakh CHD 70.62 147.89 64.67 212.12 5.46 IKFIA,IFZ 92/8- Zyryanka ZYK 65.75 150.78 59.62 216.72 3.91 IKFIA 94/4- Magadan MGD 59.97 150.86 53.56 218.66 2.83 IKIR 92/8- St. Paratunka PTK 52.94 158.25 46.34 225.91 2.10 IKIR 92/8- Moshiri MSR 44.37 142.27 37.61 213.23 1.59 STELAB 90/7- Rikubetsu RIK 43.5 143.8 34.7 210.8 1.48 STELAB 97/10- Onagawa ONW 38.43 141.47 31.65 212.51 1.38 THU 91/6- Kagoshima KAG 31.48 130.72 25.13 202.24 1.22 STELAB 90/7- Yamakawa YMK 31.19 130.62 24.85 202.13 1.21 CRL 97/7- Chichijima CBI 27.15 142.30 20.59 213.00 1.14 KMO 90/7- Guam (GAM)GUA 13.58 144.87 4.57 214.76 1.01 USGS 91/6- Yap YAP 9.3 138.5 -0.3 209.0 1.00 UK 93/1- Koror KOR 7.33 134.50 -2.64 205.21 1.00 UAF 94/8- Kototabang KTB -0.20 100.32 -10.63 171.93 1.03 STELAB/GAW 03/1- Biak BIK - 1.08 136.05 -12.18 207.30 1.05 LAPAN 92/5- Wewak WEW - 3.55 143.62 -14.14 215.27 1.06 PWH, UPNG 91/6- Darwin (DRW)DAW -12.40 130.90 -23.13 202.68 1.18 TERC, UNC 91/8- Weipa WEP -12.68 141.88 -22.99 214.34 1.18 WNSS, UNC 90/7- Birdsville (BRV)BSV -25.54 139.21 -36.58 212.96 1.55 POB 90/7- Dalby (DLB)DAL -27.18 151.20 -37.09 226.80 1.57 DAC, UNC 91/8- Canberra CAN -35.30 149.00 -45.98 226.14 2.07 IPS 94/8- Adelaide ADL -34.67 138.65 -46.46 213.66 2.11 DSTO 90/7- ----------------------------------------------------------------------------- Kotzebue KOT 66.88 197.40 64.52 249.72 5.40 UAF 93/11- Cape Shmidt CST 68.88 180.55 64.51 236.29 5.40 IKIR Ewa Beach EWA 21.32 202.00 22.67 269.36 1.17 PTWC/USGS 91/1- American Samoa ASA -14.28 170.70 -20.60 245.05 1.14 Macquarie Isl. MCQ -54.50 158.95 -64.50 247.84 5.40 AAD, UNC 92/11- ----------------------------------------------------------------------------- ----- 3. Data Quality --------------------------------------------------------- *** To any person using this geomagnetic data: Please note that when comparing amplitude data obtained by different magnetometers, a great deal of care must be taken in this kind of comparison. Because of differing calibration bases, there is likely to be some systematic differences imbedded in the data. Under no circumstance are we responsible for discrepancies arising from the comparison of data of different magnetometers. Any such comparison is done at the user's own risk. from SERC, Kyoto Univ. a) Directions of magnetic sensors are as follows. (1) for the data from the stations in the northern hemisphere, for data from WEP before 05UT on Jan. 31, 1991 and for data from ADL before July 14, 1993 [H:+ = northward] [D:+ = eastward] [Z:+ = downward] (2) for the data from the stations in the southern hemisphere, [H:+ = northward] [D:+ = eastward] [Z:+ = upward] (3) for data from CBI [H:+ = northward] [D:+ = westward] [Z:+ = downward] (4) for data from WEW [H:+ = northward] [D:+ = westward] [Z:+ = upward] b) Some other remarks * The Z-component of BSV data sometimes becomes zero due to a temporal disconnection of cable. * The Z-component of ADL data sometimes shows noisy fluctuations due to an equipment problem. * The Z-component of DAL data is meaningless after Jan. 1, 1993. * The D- and Z-components of MSR data have a DC-level, artificial fluctuation on a few days/year. * ADL is the Adelaide station (ADE). * The H-component of EWA data sometimes shows noisy fluctuations due to an equipment problem * The D-component of DAL data satulate for April 13, 1992 - July 10, 1992 c) Time tag errors These errors are only what we could find out in the data. We recommend you to compare field variations at different stations using 1-min stacked plots at http://stdb2.stelab.nagoya-u.ac.jp/mm210/index.html. interval stn error Oct.30-Nov.19, 1991 LEM Time tag data are 2 hours behind the correct time. Nov.2-16, 1991 BRV Time tag data are 1 hour ahead of the correct time. Nov.24-Dec.7, 1992 BRV Time tag data are 10 hours ahead of the correct time. Nov.25-Dec.6, 1993 ADL Time tag data are 1 hour behind the correct time. Dec.7,'93-Jan.17,'94 KOT Time tag data are 2 hours behind the correct time. Jan.18-22, 1994 CBI Time tag data are 9 hours ahead of the correct time. Mar.18-Apr.27, 1994 CBI Time tag data are 1 day behind the correct time. Mar.17-Apr.18, 1994 WEP Time tag data are 6 hours behind the correct time. Apr.21-Jul.29, 1994 WEP Time tag data are 6 hours behind the correct time. Mar.24-May 6, 1995 BRV Time tag data are 1 day behind the correct time. Apr.7-9, 1995 ADL Time tag data are 1 hour behind the correct time. Apr.27-29, 1995 ADL Time tag data are 1 hour behind the correct time. May 23-25, 1995 ADL Time tag data are 1 hour behind the correct time. Nov.1-Dec.9, 1995 CBI Time tag data are 12 hours behind the correct time. Mar.9-28, 1996 ADL Time tag data are 1 day ahead the correct time. Feb.15-Mar.7, 1997 ONW Time tag data are 1 day behind the correct time. Feb.28, 1997 BIK Time tag data are 1 hour behind the correct time. Mar.5-12, 1997 YAP Time tag data are incorrect. May 22-29, 1997 YAP Time tag data are incorrect. Jul. 1-Dec. 31, 1997 YMK Time tag data are 9 hours ahead the correct time. Apr.29-May 22, 1998 WEP Time tag data are 12 hours ahead the correct time. Apr.24-May 22, 1998 DAL Time tag data are 1 hour behind the correct time. Aug.29-Sep.17, 1998 DAL Time tag data are 1.5 hour behind the correct time. Sep.24-Oct.22, 1998 DAL Time tag data are 1.5 hour ahead the correct time. Nov.16, 1998 - Jun 19, 1999 DAL Time tag data are 1.5 hour ahead the correct time. Apr.14-May 7, 1999 KAT Time tag data are 9 hours ahead the correct time. Apr.4-19, 2001 MCQ Time tag data are 12 hours ahead of correct time. Apr.20-Sep.22, 2001 MCQ Time tag data are 1 day ahead the correct time. Apr.12-Jun.15, 2002 MCQ Time tag data are 2 days behind the correct time. Jun.16-Jul.4, 2002 MCQ Time tag data are 1 day behind the correct time. Oct.4-26, 2002 ONW Time tag data are 3 hours ahead the correct time. Aug.8-Oct.27, 2003 BIK H and Z are exchanged, time tag may be incorrect in max 13 sec due to GPS receiver error. Feb.4-July 10, 2005 KTB Time tag data may be delayed for maximum 52 sec from the correct time (network NTP stop in this interval). Sep.8, 2007-Jan.28, 2009 KAG H and D components are short-circuited in the cable before the data recorder. ------------------------------------------------------------------------------- If you have any questions or comments on the database, please feel free to contact with K. Shiokawa, STE lab., Nagoya Univ. -------------------------------------------------------------------------------