Time accuracy
Our observation system can keep time accuracy within 0.1 second.
However it depends on the receiving condition of radio wave at observatory.
Pay attention to use of our data, especially in a study affected by time accuracy.
At that time, please ask us (H. Tachihara, tachi@geo.kyushu-u.ac.jp or M. Shinohara, shino@geo.kyushu-u.ac.jp) the time accuracy of each data before your publications and/or presentations.
Quick variation
Our recording system cannot record quick variation more than about 2nT/3sec (corresponds to 40nT/min).
There is not a problem for use of data in usual variation,
but attention is necessary for use of data at SC.
Detailed information of our equipments
Please refer to the following papers.
Tachihara, H., M. Shinohara, M. Shimoizumi, O. Saka, and T. Kitamura,
Magnetometer system for studies of the equatorial electrojet and micropulsations in equatorial regions, J. Geomag. Geoelectr., 48, 1311-1320, 1996.
Saka, O., M. Shinohara, H. Tachihara, H. Akaki, H. Inoue, T. Uozumi, and T. Kitamura,
A time source for a data acquisition system designed for phase propagation study of magnetic pulsations, J. Geomag. Geoelectr., 48, 1321-1326, 1996.
Saka, O., and H. Tachihara,
A compact magnetometer data acquisition system with accurate chronometer, J. Geomag. Geoelectr., 38, 221, 1986.
Tachihara, H., T. Uozumi, H. Akaki, O. Saka, and T. Kitamura,
Use of a flash memory card for long-term geomagnetic data recording, J. Geomag. Geoelectr., 48, 1327-1331, 1996.
Data Format
We are using two data format.
J-format
Our original binary data format for 3 second sampling data.
