Space environment that causes satellite anomalies and negative effects to the human activities both in space andon the ground is referred to as space weather. In order to develop good ways to avoid such risks, it is important togather information on space weather and best practices for mitigating the risks. Space-based observation has beenconducted by JAXA (Japan Aerospace Exploration Agency) for the monitoring of the space environment. ActuallyJAXA is now installing space environment detectors on 5 satellites (LEO; 2, GEO; 2, and QZS; 1) and ISS(International Space Station) / JEM (Japan Experimental Module). These data have been provided in real time orquasi-real time via the JAXA website. In the past, JAXA experienced satellite anomalies inseveral space weather events, in which JAXA satellites were collecting space environment data. Such space weatherevents are discussed based on the observed data. We also demonstrate radiation belt empirical models, which havebeen developed in JAXA for the use of the forecast of the radiation belt variation. Some findings in the radiation beltscience are discussed with a particular attention to the enhancement of outer belt electrons in the heart of outerradiation zone and a seasonal variation of outer belt electrons. Connection between the outer belt and the inner beltover the slot region is discussed.
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