@prefix ns0: . @prefix skos: . ns0:altLabel [ ] ; skos:definition """The High Resolution Telescope and Spectrograph (HRTS) instrument was successfully launched on Sept. 30, 1997 from LC-36 at the White Sands Missile Range. The instrument consists of 30cm Cassegrain telescope and a three element focal plane package. The central focal plane instrument was a tandem Wadsworth spectrograph with wavelength coverage in two bands (120-140nm and 150-170nm) with a resolution of 50mAngstroms. The reflective spectrograph slit jaws are imaged with an intermediate bandpass UV spectroheliograph and with a visible Halpha imaging slit jaw imaging system. As on the previous flight, four (20Angstrom FWHM) filters were used in the spectroheliograph to obtain images with central wavelengths at 1540, 1550, 1560 and 1600 Angstroms. The spectra and images are recorded on photographic film. The instrument was successfully pointed and focussed in flight. 1 arc-second spatial resolution was achieved in all the images. The observation target for the mission was the coronal hole at the solar north pole. During the prime mission, the 900" long slit was moved over the surface of the sun to obtain a 10" wide raster with 2" steps. The slit was positioned nearly radially with 100" above the northern limb of the sun. A wide range of exposures were taken to observe a wide variety of bright and faint lines. A series of spectroheliograph and Halpha images were taken of the spectrograph slit jaws to reference the slit location. Final image coregistration will be accomplished using slit jaw, Tmin continuum images and Kitt Peak/MDI magnetograms. An excellent collaborative data set was obtained at Kitt Peak Observatory (chromospheric and photospheric magnetograms), Big Bear Solar Observatory and University of Hawaii. The space based collaborative observing campaign included SXT (YOHKOH), MDI (SOHO), EIT (SOHO), CDS (SOHO) and SUMER (SOHO). The slit spectra show an interesting collection of explosive even ts in C IV. The spectroheliograph images show C IV loop like structures near the limb. The flight also was the first scientific flight of the new digital attitude control system produced by the Lockheed Martin SPARCS group at the White Sands Missile Range. The system utilizes fast, programmable digital control of the payload. The previous problem of ground loop noise on the shielded sensor lines was entirely eliminated by the incorporation of a fiber optic sensor data line. The performance of this new system was superb. Acquisition occurred within 30 seconds of opening the aperture door. The noise on the sensor output lines was 0.05 arc-seconds. The stability over the entire flight was 1.5 arc-seconds peak to peak. The stability of the pointing over a typical 10 second exposure was 0.2 arc-seconds peak to peak and <0.1 arc-seconds peak to peak for a typical 1 second exposure. This pointing stability in future flights will enable very high spatial resolution solar images to be obtained from a sounding rocket platform. Additional information available at "http://wwwsolar.nrl.navy.mil/hrts.html" {Summary provided by Naval Research Laboratory}"""@en ; skos:prefLabel "HRTS"@en ; skos:inScheme ; skos:broader ; a skos:Concept . skos:prefLabel "Imaging Spectrometers/Radiometers"@en ; a skos:Concept ; skos:narrower .