The Cosmic Origins Spectrograph (COS) was installed in the Hubble Space Telescope in May, 2009 as part of Servicing Mission 4 to provide high sensitivity, medium and low resolution spectroscopy at far-and nearultraviolet wavelengths (FUV, NUV). COS is the most sensitive FUV/NUV spectrograph flown to date, spanning the wavelength range from 900 Å to 3200 Å with peak effective area approaching 3000 cm 2 . This paper describes instrument design, the results of the Servicing Mission Orbital Verifi-
We observed the Io torus from 820-1140 /!• on UT 20.25 July 1994 from a sounding rocket telescope/spectrograph. These observations serve as only the fourth published spectrum of the torus in this wavelength range, and the only FUV data documenting the state of the torus during the Shoemaker-Levy 9 impacts. Introduction At 05:54UT on 20 July 1994 our EUVS telescope and spectrograph payload was successfully launched on a Black Brandt IX sounding rocket from White Sands, New Mexico, to obtain far ultraviolet spectra of Jupiter and the Io plasma torus during the Shoemaker-Levy/9 (SL/9) impacts. The L impact had occured about 8 hours earlier and the N impact was still over 4 hours in the future. We launched the payload at this time to satisfy a variety of launch window constraints and to obtain observations at a system III Central Meridian Longitude (CML) of 1804-20 degrees. CML 180 is the longitude at which the Jovian north polar UV aurora are historically observed to peak (Livengood et al. 1990). Concurrently, the Extreme Ultraviolet Explorer (EUVE) observatory was obtaining spectra of Jupiter and the torus from 70 to 760 ]i, and the International Ultraviolet Explorer (IUE) was obtaining an 1150-1950 ]i spectrum of the torus. The EUVS data essentially bridge the gap between the EUVE and the IUE spectra. The closest Rosat x-ray observatory observations began about 7 hours after the EUVS flight, approximately coincident with Hubble Space Telescope (HST) observations that included torus spectroscopy (cf., Mc-Grath et al. 1995; Waite et al. 1995). EUVS observed Jupiter fi-om a lnission elapsed time of T+115 seconds (upleg, 162 km) to T+390 seconds (downleg, 193 km). At apogee the zenith angles of Jupiter and the Sun were 78.4 o a.nd 124 ø, respectively; the apparent Jupiter system III CML was 166 ø. The
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