Abstract This paper addresses the improved science resulting from joint observations performed by the different instruments onboard the Advanced Space-based Solar Observatory (ASO-S) mission along with ancillary instruments on missions flying at the same time. It first describes the three major instruments along with their stated objectives. Then it presents some basic science issues concerning jointly observed flares, coronal mass ejections (CMEs) and eruptive prominences (EPs). Each physical candidate (magnetic reconnection, instability, hard X-ray emission and magnetic coronal field topology) is discussed in terms of its signature and identification with ASO-S instrumentation. The importance of Lyα detection and non-LTE modeling is stressed. Some instrumental and science challenges are briefly discussed.
Keywords techniques: imagery, polarimetry — Sun: eruptions, flares, coronal mass ejections
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