STEREO-B/SECCHI/EUVI FITS data

The Extreme Ultraviolet Imager (EUVI) is part of the Sun Earth Connection Coronal and Heliospheric Investigations (SECCHI) instrument suite on the NASA STEREO mission. The SECCHI on the two STEREO spacecraft are identical suites of remote sensing instruments designed to observe coronal mass ejections (CMEs) at the Sun and in transit outwards to 1 AU.

EUVI measured emission lines at 30.4 nm (He II), 17.1 nm (Fe IX), 19.5 nm (Fe XII), and 21.1 nm (Fe XIV). The EUVI's 2048 x 2048 pixel detectors have a field of view out to 1.7 solar radii, and observe in four spectral channels that span the 0.1 to 20 MK temperature range. In addition to its view from two vantage points, the EUVI will provide a substantial improvement in image resolution and image cadence over its predecessor SOHO-EIT, while complying with the more restricted mass, power, and volume allocations on the STEREO mission.

极紫外成像仪（Extreme Ultraviolet Imager, EUVI）是美国国家航空航天局（National Aeronautics and Space Administration, NASA）STEREO任务搭载的日地连接日冕与日球层探测（Sun Earth Connection Coronal and Heliospheric Investigations, SECCHI）仪器套件的组成部分。两台STEREO航天器搭载的SECCHI为完全一致的遥感仪器套件，旨在观测太阳上的日冕物质抛射（coronal mass ejections, CMEs）及其向外传播至1天文单位（Astronomical Unit, AU）的过程。

EUVI可探测30.4 nm（He II）、17.1 nm（Fe IX）、19.5 nm（Fe XII）以及21.1 nm（Fe XIV）波段的发射谱线。其搭载的2048×2048像素探测器视场可达1.7倍太阳半径，可通过覆盖0.1至20兆开尔文（Megakelvin, MK）温度范围的四个光谱通道开展观测。相较于前代仪器SOHO-EIT，EUVI除可从两个观测站位获取观测数据外，还在图像分辨率与成像帧率上实现了显著提升，同时满足了STEREO任务对质量、功耗及体积的严格约束要求。