Far Ultraviolet observations from the IMAGE mission Stephen B. Mende (Space Sciences Laboratory, Centennial Drive at Grizzly Peak, University of California, Berkeley, CA 94720-7450 TEL: 510-642-0876 FAX: 510-643-2624 EMAIL: mende@apoll.ssl.berkeley.edu) The New Millennium Magnetosphere: Integrating Imaging, Discrete Observations, and Global Simulations, Sixth Huntsville Modeling Workshop, Guntersville, Alabama, 26-30 October 1998. The far ultraviolet (FUV) imaging instruments on the IMAGE mission will provide global (day and night time) images of the aurora for joint analysis of the data taken by other instruments on the satellite. The IMAGE FUV Lyman alpha photometers, in combination with the solar Lyman alpha flux measurements from other sources, will be used to obtain the gecoronal neutral density distributions to measure the density of the source of neutrals for charge exchange reactions. Three photometer channels looking radially outward with one degree field of view each. The elliptical orbit and the spinning satellite will provide a measurement set which will validate models of geocoronal hydrogen distributions in real time. During each satellite spin cycle (2 min. spin period) the fuv imagers spend only a very short time looking at the earth while at apogee providing relatively low duty cycle. Two instruments are used for FUV auroral imaging. To document the auroral morphology with the largest possible signal to noise ratio the Wide band Imaging Camera (WIC) is operated in broadband (140-180 nm) to cover the entire LBH region with a field of view of about 17 degrees. The camera operates in a fast framing mode. The frames are co-added in hardware memory to produce a single image per revolution. The spectrographic imager of (SI) is a novel grating monochromator in which an image is formed at the grating which is then re-imaged on two parallel detectors. The instrumental pass band as imaged on one of the detectors is the wavelength region of 135.6 nm Oxygen line emission and as imaged on the other detector is the wavelength region adjacent to Lyman alpha. The monochromator entrance slit and the Lyman alpha exit slits contain a grill consisting of nine parallel slits which are positioned so that the grills block the radiation for the geocoronal hydrogen emission while passing the Doppler shifted auroral emission. This will enable the SI make global hydrogen auroral observations.