Abstract
ABSTRACT The Extreme Ultraviolet Imager s (EUVIs) were launched on 21 st July 2012 as payloads to the Exposed Facility of the Japanese Experiment Module (JEM-EF) on the International Space Station. The EUVIs are parts of the IMAP (Ionosphere, Mesosphere, upper Atmosphere, and Plasmasphere mapping) mission to observe the Earths upper atmosphere, mesosphere, ionosphere, thermosphere and plasmasphere. The other part of IMAP is a visible and near-infrared spectral imager (VISI). In this mission, we install two independent and identical telescopes. One telescope detects the terrestrial EUV emission from O + (at the wavelength of 83.4 nm), and the other one detects He + (30.4 nm). At the altitude of approximately 400 km, the two telescopes di rect towards the Earths limb to look at the ionosphere and plasmasphere from the inside-out. The maximum spatial resolution is 0.1 A and time resolution is 1 minute. The optical instruments consist of multilayer coated mirrors which are optimized for 30.4 nm, metallic thin filters and 5-stage microchannel plates to pick up photon events efficiently. In our presentation, we report the mission overview, the instruments and the result of ground calibrations. Keywords: EUV, International Space Station, Microchannel plate, Plasmasphere
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