News and Announcements [in Japanese]
★ Back Numbers ★
1997: No. 41 [Jan], No. 42 [Mar], No. 43 [May], No. 44 [Jul], No. 45 [Sep], No. 46 [Nov]
1998: No. 47 [Jan], No. 48 [Mar], No. 49 [May], No. 50 [Jul], No. 51 [Sep], No. 52 [Nov]
1999: No. 53 [Jan], No. 54 [Mar], No. 55 [May], No. 56 [Jul], No. 57 [Sep]
★地磁気センターニュース No.58／1999年11月30日発行★
１．新着地磁気データ
前回ニュース（1999年9月24日発行,No.57）以降入手、または、当センターで入力したデータ
の内、主なものは以下のとおりです。（観測所名の省略記号等については、データカタログ
（http://swdcdb.kugi.kyoto-u.ac.jp/catmap/obs-j.html)またはデータベース'ＧＥＯＭＡＧ'
をご参照ください。）
Newly Arrived Data
（１）Analogue Data
Annual Reports and etc.:
Tsumb(1998), Niemegk(Sep. 1999), BMT(1996), Sodankyla(1998)
Finnish Obs.(OUJ, HAN, NUR, SOD, Sep.-Oct.1999)
（２）Digital Data
Geomagnetic Hourly Values:
KAK,MMB(Aug.-Oct.1999), GZH(Jan.-Aug. 1979), BNG(1955,56,62,63)
THL(1963), QGZ(1998), KSH(1998), THJ(1998), MZL(1998), CDP(1998)
GDH(1927,1932-34), NGK(1998), AAE(1997), AMT(1996-98), CBI(Jan.-Jun.1999)
Geomagnetic 1 Minute Values:
KAK,MMB(Aug.-Oct.1999), VAL(Aug.-Sep.1999), HTY(Mar.-Sep.1999)
HUA(1998-Jan 1999), NGK(1998), AAE(Aug.-Dec.1997), CBI(Jan.-Jun.1999)
Geomagnetic 1 Second Values:
KAK,MMB(Aug.-Oct.1999)
（３）Kp Index
Kp-Index Table(Sep.-Oct.1999)
データの注文等は、当センター宛、書面またはＦＡＸにてお願いします。
なお、大半のディジタルデータは当センターのホームページ(URLアドレス
http://swdcdb.kugi.kyoto-u.ac.jp/index-j.html)からプロット及びデータ出力が可能です。
２．一時間値Ｄｓｔ指数の算出と配布
1999年8月〜9月までのＤｓｔ指数(Provisional)を算出し、関係機関に配布しました。ご希望の方は、
郵便またはファクシミリにて、京都大学大学院理学研究科地磁気世界資料解析センターまでお申し込み下さ
い。なお、Quick Look Dst指数 (http://swdcdb.kugi.kyoto-u.ac.jp/dstdir/)および Quick Look AE指数
(http://swdcdb.kugi.kyoto-u.ac.jp/aedir/ae/quick.html) は2〜3日の遅れで当センターのホームページか
ら利用できます。
３．データカタログNo.25の印刷と配布
当センターで収集・整理・サービスしております地磁気データのカタログNo.25を印刷し、10月末に関連
機関に配布しました。残部がまだ多少ありますので、新たにご希望の方は郵便またはファクシミリにて当セ
ンターまでお申し込み下さい。なお、データ収集状況は9月10日現在で、京都大学大型計算機センターに構築
して公開サービスしていますデータベースＧＥＯＭＡＧの地磁気・観測データの収集状況を集めたＳＤＴテ
ーブルおよび観測所情報を収納したＳＴＡＴテーブル、及び当センターのホームページの中身(全データカタログ)も、
同様に更新されています。
なお、ホームページ上でも指定された緯度・経度の範囲内の観測所についての印刷されたカタログに準じた観測所
情報のリスト出力が可能です。
オンライン利用可地磁気データの先週の追加情報はhttp://swdcdb.kugi.kyoto-u.ac.jp/wdc/onnew/onnew-j.html
でご覧になれ、4週間前まで遡ることができます。
４．ペルーヒカマルカ観測所について (Oscar Veliz）
11月15日から11月28日まで当センターに滞在されたペルー地球物理研究所のOscarVeliz博士に、ペルーに
おける地磁気観測の現状についての記事を書いていただきました。
PRESENT STATUS OF THE PERUVIAN GEOMAGNETIC OBSERVATIONS
By Oscar Veliz
1. INTRODUCTION
Seven geomagnetic stations are in operation at present, three are absolute observatories
(Huancayo, Ancon,
Arequipa) were absolute observations are currently carried out and the remain are variation stations
mainly operated for specific scientific research projects. See the station location in Fig. 1 and
the instrumental description on table 1.
2.- HUANCAYO MAGNETIC OBSERVATORY
Huancayo Observatory was established in 1922 by the Carnegie Institution of Washington, soon
the abnormally amplitude of the geomagnetic field diurnal variation observed led to intensive studi
es to explain this phenomenon, and finally it was called "Equatorial Electrojet" by Chapman (1951) a
nd others. Huancayo has had very important role because of its unique position near the magnetic equa
tor as well as the long and excellent data supplied by this observatory since the days of Carnegie. U
nfortunately its long standing of data collection was interrupted in December 1992, when absolute obs
ervations were stopped although daily records were continued only as relative variation. As the scien
tist at World wide were quite concerned because Huancayo Observatory was not reporting magnetic data
for more than three years, the IGP decided in 1996 to resume the normal geomagnetic observations at H
uancayo. Reorientation and recalibrations of the Eschenhagen variometers were made and restarting to
operate in middle 1996, also absolute observations were resumed using modern absolute instruments.
A three component Ring core fluxgate magnetometer developed at the Tokyo University is currently in
operation as the main variometer system. The sampling rate used is 10 seconds. Absolute 1 minute X, Y,
Z mean values are derived from 10 sec. data using baseline values computed from absolute observation
s. The data acquisition system is composed by an 12 bits ADC board connected to an IBM compatible PC.
Permanent Internet connection is available at the Observatory site since December 1997. FTP server h
as been installed to provide service for magnetic data base access from outside.
Another new magnetometer system which is part of a project called "Ocean Hemisphere bottom
magnetometer" has been in operation continuously since July 1997. The aim of the project is to obtai
n data needed for the analysis of deep structure of the Earth. Although the original plan did not i
nclude the continent it was decided to put one of the magnetometers in Peru, since there are few obse
rvatories reporting data from South America. One second X,Y,Z data and one minute F data are recorde
d on a ZIP disk which are changed once a month and sent to the Earthquake Research Institute of the U
niversity of Tokyo, Japan.
3. ANCON GEOMAGNETIC OBSERVATORY
The fluxgate magnetometer made at the Geophysics Research Laboratory (GRL) of The Univers
ity of Tokyo, Bunkyo-ku, Tokyo, Japan (1984), is employed currently to conduct continuous geomagneti
c field (H, D, Z) measurements. 10 seconds sampling rate data are available for Ancon station since S
eptember 1991 up to now and can be obtained in PC compatible diskettes in a ASCII format. Digital dat
a obtained with the automatic fluxgate recording system are edited, filtered and processed to create
ASCII user portable files for subsequent final processing to obtain absolute data, minute means, hour
ly means. Reduced and standard 20 mm/hr. simulated magnetograms are generated for K index scaling and
special geomagnetic phenomena monthly reports.
4.- DATA PROCESSING AND HANDLING
Minute mean values from Huancayo digital magnetometer are available since May 1997
with absolute baseline control. Final 1 minute data processing has been completed and sent to the
World Data Center for Geomagnetism C2 operated by Kyoto University.
One minute provisional data from Ancon and Huancayo are being transferred to the WDC-C2 in
Kyoto by E-mail and FTP connection since late April 1999. The plots can be seen on the WDC for Geoma
gnetism Kyoto Home page.
contact on this page: iyemori@kugi.kyoto-u.ac.jp