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A Truly Global EUV Wave From the SOL2017-09-10 X8.2 Solar Flare-CME Eruption View all abstracts by submitter

Wei Liu   Submitted: 2018-07-25 10:19

We report SDO/AIA observations of an extraordinary global extreme ultraviolet (EUV) wave triggered by the X8.2 flare-CME eruption on 2017 September 10. This was one of the best EUV waves ever observed with modern instruments, yet likely the last one of such magnitudes of Solar Cycle 24 as the Sun heads toward the minimum. Its remarkable characteristics include: (1) The wave was observed, for the first time, to traverse the full-Sun corona over the entire visible solar disk and off-limb circumference, manifesting a truly global nature, owing to its exceptionally large amplitude, e.g., with EUV enhancements by up to 300% at 1.1 Rsun from the eruption. (2) This leads to strong transmissions (besides commonly observed reflections) in and out of both polar coronal holes, which are usually devoid of EUV waves. It has elevated wave speeds >2000 km s-1 within them, consistent with the expected higher fast-mode magnetosonic speeds. The coronal holes essentially serve as new ''radiation centers'' for the waves being refracted out of them, which then travel toward the equator and collide head-on, causing additional EUV enhancements. (3) The wave produces significant compressional heating to local plasma upon its impact, indicated by long-lasting EUV intensity changes and differential emission measure increases at higher temperatures (e.g., log T=6.2) accompanied by decreases at lower temperatures (log T=6.0). These characteristics signify the potential of such EUV waves for novel magnetic and thermal diagnostics of the solar corona {it on global scales}.

Authors: Wei Liu, Meng Jin, Cooper Downs, Leon Ofman, Mark Cheung, and Nariaki V. Nitta
Projects: SDO-AIA

Publication Status: Accepted by ApJ Letters (as of July 24, 2018)
Last Modified: 2018-07-29 21:13
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