Shinichi Watari

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It is often discussed that the fourth methodology for science researches is “informatics”; the first methodology is theoretic approach, the second one is observation and/or experiment, and the third one is computer simulation. The informatics is expected as a new methodology for data intensive science, which is a new concept based on the fact that most of(More)
In this study, a neural network technique is adopted to predict the electron flux in a geosynchronous orbit using several items of solar wind data obtained by ACE spacecraft and magnetic variations observed on the ground as input parameters. Parameter tuning for the back-propagation learning method is attempted for the feed-forward neural network. As a(More)
Space weather can be predicted using data from satellites. For example, the condition of high-energy electrons at geostationary orbit is vital in providing warnings for spacecraft operations. We investigate an adaptive predictor based on intelligent information processing. The predictor forecasts the condition of high-energy electrons at geostationary orbit(More)
The soft X-ray telescope on board Yohkoh observed a rising network of laments during the formation of a coronal mass ejection (CME) on 5 October 1991. One of the laments, termed here a \string", appeared to lie above and along a photospheric neutral line; such a feature appears to be characteristic of a class of lament eruption { arcade { CME events. The(More)
Cross-sectional studies have become important for an improved understanding of various Solar-Terrestrial Physics (STP) fields given the great variety and different types of observations from the sun to the earth. In order to better combine, compare and analyze different types of data together, a system named STARS (Solar-Terrestrial data Analysis and(More)
The National Institute of Information and Communications Technology (NICT) operates a Japanese space forecast center for the International Space Environment Service (ISES). Information on space weather is exchanged daily among the space weather forecast centers all over the world. Researches of space weather need data on large areas of space from the Sun to(More)
An outline of a planned system for the global space-weather monitoring network of NICT (National Institute of Information and Communications Technology) is given. This system can manage data collection much easier than our current system, by installations of autonomous recovery, periodical state monitoring, and dynamic warning procedures. According to a(More)
In this paper, we examine the accuracy of several calculation methods for iron loss of rotating machines using the finite element method. Two calculation methods are compared with the measurements. One is based on the Fourier transformation of the flux density waveforms at each finite element. The other is the direct calculation from the waveforms without(More)