Geomagnetic Observation by Magnetometer Network.
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***** *****
***** README file for one-minute magnetic field database *****
***** of the 210 (deg) meridian chain *****
***** *****
***** November 26, 1998, written by K. Shiokawa and K. Yumoto *****
***** (STE Lab., Nagoya Univ.) *****
***** *****
***** contact address : *****
***** Solar-Terrestrial Environment Laboratory, Nagoya University *****
***** 3-13 Honohara, Toyokawa, Aichi 442-8507, JAPAN *****
***** Tel: 81-533-89-5168, Fax:81-533-89-1539 *****
***** E-mail: shiokawa[AT]stelab.nagoya-u.ac.jp *****
***** *****
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Thank you for your collaborations using the 210 (deg) MM
(magnetic meridian) magnetic field data !!! This is the README
file for one-min value data file. Please read this file carefully
before using the data base.
----- 1. Rules for Data Use --------------------------------------------
Please contact the principal investigator, Professor K. Yumoto, Kyushu
University, before using the data at any publication and/or presentation.
If the data is essential to your research, the PI will require
coauthorship, acknowledgements, and related references. These collaborations
are very important for the continuation of the 210 MM project.
Reference: Yumoto, K., and the 210 (deg) MM Magnetic
Observation Group, The STEP 210 (deg)
magnetic meridian network project, J.
Geomag., Geoelectr., 48, 1297-1309, 1996.
----- 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 in 1 character; it may be X, Y, or Z.
!!!!!!! Please note that X is H-component and Y is D-component
in the 210 MM data. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*OBS is the 3 letter abbreviation for the observatory.
*ORG is origin of data. In this data base, ORG is blank.
*BLANKS are 10 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.
*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.
The abbreviations of stations are as follows.
STN(DATABASE) STN(PAPER*) Station name NPD(deg) LONG(deg)
TIX - TIXIE 18.42 129.00
CKD CHD CHOKURDAKH 19.38 147.89
MGD MGD MAGADAN 30.03 150.86
PTK PTK ST. PARATUNKA 37.06 158.25
MSR MSR MOSIRI 45.63 142.27
ONW - ONAGAWA 51.57 141.47
KAG KAG KAGOSIMA 58.52 130.72
CBI CBI CHICHIJIMA 62.85 142.30
EWA EWA EWA BEACH 68.68 202.00
GAM GUA GUAM 76.42 144.87
BIK - BIAK 91.08 136.05
WWK WEW WEWAK 93.55 143.62
DRW DAW DARWIN 102.40 130.90
WEP WEP WEIPA 102.68 141.88
LEM LMT LEARMONTH 112.22 114.10
BRV BSV BIRDSVILLE 115.83 139.33
DLB DAL DALBY 117.18 151.20
ADL ADE ADELAIDE 124.67 138.65
MCQ - MACQUARIE IS. 144.50 158.95
*PAPER : Yumoto et al.(J. Geomag. Geoelectr, p.261, 1992).
----- 3. Data Quality ---------------------------------------------------------
a) Directions of magnetic sensors are as follows.
(1) for all data from MSR, ONW, KAG, EWA, GUA, TIK, CHD, MGD, PTK,
and ADL, and for data from WEP before 05UT on Jan. 31, 1991
[H:+ = northward] [D:+ = eastward] [Z:+ = downward]
(2) for all data from BSV, LMT, DAW, BIK, MCQ, and DAL, and for data
from WEP after 05UT on Jan. 31, 1991
[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
(1) The time of the data from BSV for Nov. 24, 1992 - Dec. 7, 1992
is 10 hour behind the correct time.
(2) The Z-component of BSV data sometimes becomes zero due to a
temporal disconnection of cable.
(3) The Z-component of ADL data sometimes shows noisy fluctuations
due to an equipment problem.
(4) The Z-component of DAL data is meaningless after Jan. 1, 1993.
(5) The D- and Z-components of MSR data have a DC-level, artificial
fluctuation on a few days/year.
(6) ADL is the Adelaide station (ADE).
(7) The time of the data from BSV for Nov. 2, 1991 - Nov. 16, 1991
is 1 hour faster than the correct time.
(8) The H-component of EWA data sometimes shows noisy fluctuations
due to an equipment problem
(9) The D-component of DAL data satulate for April 13, 1992 - July
10, 1992
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If you have any questions or comments on the database, please feel free
to contact with K. Shiokawa, STE lab., Nagoya Univ.
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c-----------------------------------------------------------------
c
c Sample FORTRAN program to read the
c one-minute ascii data of 210 chain
c
c November 21, 1998 written by Kazuo Shiokawa
c Solar-Terrestrial Environment Laboratory
c Nagoya University
c 3-13, Honohara, Toyokawa, Aichi 442-8507, Japan
c E-mail: shiokawa[AT]stelab.nagoya-u.ac.jp
c
c------------------------------------------------------------------
subroutine r_kyotob(iyr, mon, idm, aobs, b)
c
integer intmag(60)
real*4 b(3, 1440)
character*1 bcomp
character*3 aobs
c
do icomp = 1, 3
do jhr = 1, 24
read(11, 600) iyr, mon, idm, bcomp, ihr, aobs, intmag
600 format(12x, i2, i2, i2, a1, i2, a3, 10x, 60i6)
do min = 1, 60
n = 60*float(jhr-1) + min
b(icomp, n) = float(intmag(min))*0.1
end do
end do
end do
c
return
end
c-----------------------------------------------------------------
Geomagnetic Observation by Magnetometer Network.