Space environment measurements by JAXA satellites and ISS/JEM

In order to monitor space environment and its temporal variations, JAXA Space Environment Group has been developing space radiation detectors as well as magnetometers and installing them on Low Earth Orbit (LEO) satellites, Geostationary Orbit (GEO) satellites, Geostationary Transfer Orbit (GTO) satellite, Quasi Zenith Orbit (QZO) satellite and Japanese Experimental Module (JEM) of the International Space Station (ISS). We are using these space environment data to know the situation of space environment and to provide warning messages to the satellite operators as well as ISS/JEM manager, when the space environment will be harmful. Based on our observation data, we also have constructed an advanced electron belt model for the use in satellite manufacturing. With space radiation data obtained by JAXA satellites and ISS, some findings related to the space radiation environment have been obtained. We will review our activities related to the space environment research and development in JAXA.

► Based on JAXA satellite observation data, we have constructed an advanced electron radiation belt model, which accommodates dynamical behaviour of the electron radiation belt for the use to satellite manufacturing.
► JAXA satellite observations have been used for monitoring space situation to aviod satellite anomaly.
► Some findings related to the radiation belt science have also been obtained, including a supply of seed electrons, which lead to a large enhancement radiation belt electrons during geomagnetic storm.