Back to List Page

Japanese

Magnetic Field Data from the STEP Polar Network

Name of Database Magnetic Field Database from the STEP Polar Network
Institution Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
Contents

This database provides or is expected to include information and data obtained at over forty locations from the magnetometer networks that we have conducted in the northern polar region since 1984.

The data before 1991 are those obtained in several limited periods that we had observation campaigns or those recorded at a few of sites which were operated in semi-routine base. The present network system which we call as "STEP Polar Network" started in 1991 and was yearly enhanced during the international coordinated program of Solar-Terrestrial Energy Program(STEP) that lasted until 1997.

We started this database to provide our magnetic field data for public use in an order of priority composed of the following categories; (A)on type of data: (a1) Low time resolution (1 minute) data and (a2) high time resolution(1 second) data obtained by fluxgate magnetometers; (a3) Induction magnetometer data which is sampled by 10Hz; (P) on data period: (p1) the STEP period, (p2) the post STEP period, and (p3) the pre-STEP period.

Data presently accessible from our web page are mainly for combined categories of (a1)&(p1), (a1)&(p2), and (a2)&(p1) as are shown in the matrix below;

             (a1)  (a2)  (a3)
        (p1)  Y    Y   Y--
        (p2)  Y-   Y   Y--
        (p3)  Y-   Y--　Y---
        Y:fully accessible, Y-:most or major part is accessible,
        Y--:only samples, Y---:data exist but no accessible yet.

In 2004 all data of matrix elements became fully accessible since 2004 and on-line plotting service of the magnetometer data started (http://www-space.eps.s.u-tokyo.ac.jp/~hayashi).

On-line data collection from selected sites were started by using internet links.

　 Gakona, July 1999－ Search-coil magnetometer data, every 10 minutes

　 LaRonge, October 2001－Fluxgate and Search-coil magnetometer data, once a cay

　 Fort St John, October 2004－Fluxgate and Search-coil data, every 10 minutes

　 Lucky Lake, October 2004－Fluxgate and Search-coil data, every 10 minutes

　 (Semi real-time plots are visible on the web page for data from Gakona, Fort St John, and Lucky Lake)

More detailed information, characteristics of data, policy on data usage, practical ways to access each data, and etc. are available by selection of menu items in the left side(*) window of the web page, such as "S&Pick/1min" (for searching and picking data files of 1 minute time resolution).

(*) This is the case if a window browser is responsible to frame tag of HTML.
Examples
Figure 1. An example of online plotting service of the flux-gate magnetometer data for 10 days from Aug. 10, 1999, Eureka, Xm-component, 1 minute resolution,.


Figure 2. An example of on-line plotting service of the search-coil magnetometer data processed for FFT dynamic spectrograms (nine stations of Eureka, Fort Nelson, Gakona, Goose Bay, Hornepayne, Lucky Lake, Borok, Uzur and Mondy; January 03, 2001), as expressed with color-coded hodogram-orientation of X and Y FFT components.

Contact Kanji Hayashi
(c/o)Formerly, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
7-3-1 Hongo, Bunkyo, Tokyo, 113-0033, Japan
TEL: +81-3-5841-4585
FAX: +81-3-5841-8321
hayashi[AT]eps.s.u-tokyo.ac.jp
qyi05527[AT]nifty.com
Public Offering of Database

http://www-space.eps.s.u-tokyo.ac.jp/~hayashi

or http://step-p.dyndns.org/~khay ( mainly maintained here after 2004)
CAWSES & S-RAMP CD/DVD-ROM OB0008 OB0009 OB0010 OB0011 OB0025