![]() ![]() Unlike galactic cosmic rays whose flux is stable for a long time, SEP events are sporadic and unpredictable during any solar cycle. Once leaving the near-Earth environment and going into space, astronauts and spacecraft without the protection of the geomagnetic filed are inevitably exposed to intense high energy particle radiation. The study of the acceleration and propagation mechanism of solar energetic particles is of great importance in space physics. At the time of eruption of the SEP event, TW-1 and Earth were approximately on the same magnetic field line, meaning that TW-1 and near-Earth spacecraft could observe solar energetic particles from a distance of tens of millions of kilometers, which provided a rare opportunity to study the effects of energetic particle propagation. ![]() ![]() On November 29, 2020, MEPA observed the first large widespread SEP event of solar Cycle 25 at 1.39 astronomical unit. It was launched with the TW-1 spacecraft in July, 2020 to start exploration mission. MEPA, jointly developed by IMP and the Lanzhou Institute of Physics, is the first scientific payload of China aimed at studying the interplanetary and near-Mars space radiation environment. ![]()
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