关于受扰日冕物质抛射（CME）物质回落至低日冕（low corona）的观测

本文利用索贺号（SOHO）、日地关系观测台（STEREO）及太阳动力学天文台（SDO）的观测数据，研究了一次受扰日冕物质抛射（CME）的物质回落现象。研究发现，受扰CME的部分物质在被另一CME携带后，最终以小规模喷流形式回落至低日冕，并表现出明显的温度依赖性。

arXiv:2608.17951v1 Announce Type: new Abstract: We present an empirical study of a disrupted CME, parts of which fall back to the Sun, using observations from SOHO, STEREO-A, and SDO. At UT 18:00 on 2024 August 16, a slow CME is overtaken by a faster CME. A leg of the second CME carries part of the slower CME out with it, resulting in an unusually well-defined flux rope leg for this CME. This second CME is observed in radio by the VLA, with Faraday rotation measurements showing a clear magnetic flux rope signature. A strong response is also later seen when the radio-observed line of sight enters the CME leg enriched by material from the disrupted CME. Outside this leg, the rest of the disrupted CME simply disappears and is replaced by a large number of small jet-like downflows. We see clear evidence of this plasma falling back to the low corona in EUV images from SDO, roughly 6-17 hours after the CME is disrupted, with an inferred downward velocity of V=-30 km/s. There is a clear temperature dependence, with the downflows seen first in the 211 bandpass, followed successively by responses at 193, 171, and 304. The downflows are much