作者: S. Patsourakos , A. Vourlidas , Y. M. Wang , G. Stenborg , A. Thernisien
DOI: 10.1007/S11207-009-9386-X
关键词:
摘要: One of the major discoveries Extreme ultraviolet Imaging Telescope (EIT) on SOHO was intensity enhancements propagating over a large fraction solar surface. The physical origin(s) so-called EIT waves is still strongly debated with either wave (primarily fast-mode MHD waves) or nonwave (pseudo-wave) interpretations. difficulty in understanding nature EUV lies limitations observations that have been used almost exclusively for their study. They suffer from low cadence and single temperature viewpoint coverage. These are largely overcome by SECCHI/EUVI onboard STEREO mission. EUVI telescopes provide high-cadence, simultaneous multitemperature coverage two well-separated viewpoints. We present here first detailed analysis an observed disk imagers 7 December 2007 when spacecraft separation ≈ 45°. Both small flare coronal mass ejection (CME) were associated wave. also offer comprehensive comparison various interpretations against observations. Our findings as follows: (1) High-cadence (2.5-minute) 171 A images showed strong association between expanding loops onset significant differences appearance viewpoints during its early stages; these disappeared later; (2) appears at active region periphery abrupt disappearance occurs within interval 2.5 minutes; (3) different temperatures most visible 1 – 2 MK range invisible chromospheric/transition temperatures; (4) triangulations indicate it rather lying (≈ 90 Mm above surface); (5) forward-fitting corresponding CME seen COR1 coronagraphs projection best-fit model surface inconsistent location size co-temporal wave; (6) simulations found good agreement overall shape give support interpretation they probably triggered rapid expansion CME.