Learn More
This paper describes the derivation of the preflight photometric calibration of the uv spectrometer on Skylab. The calibration of the orbiting instrument through cross-comparison with two rocket instruments is discussed in assessing the observed changes in response to quiet solar regions during the mission. Formulas are presented for the determination of(More)
The performance of a one-dimensional photon-counting detector array based on microchannel array plates has been evaluated in the laboratory over the wavelength range from 461 A to 1216 A. The output charge pulses from a set of cascaded microchannel array plates were collected on a proximity-focused anode array consisting of sixty-four linear electrodes 1.3(More)
Initial measurements of the position sensitivity of a visible-light multi-anode microchannel array (MAMA) detector show that centroid calculations for image spots are accurate to better than 0.04 pixels even with sources that are essentially delta functions at the photocathode. Subpixel sensitivity variations of 10-15% are typically found for pixels in the(More)
The photoelectric yields of 2000-A thick samples of MgF(2) and LiF have been measured at wavelengths in the range 1216-461 A. Peak values of 43% and 34%, respectively, were obtained at wavelengths around 550 A at 45 degrees incidence. Coating the cathode of a channel electron multiplier with 3000 A of MgF(2) produced no significant deterioration in the(More)
Grant, H. J. 1919. Beginning of the Sugar Industry in Utah. Official Report of the Eighty-ninth Annual Conference of The Church of Jesus Christ of Latter-day Saints. June 1, 1919. The Church of Jesus Christ of Latter Day Saints, Salt Lake City, UT. Harris, F. S. 1926. The Sugar-Beet in America. The Macmillan Co, New York. Miner, E. L. et al. 1982. History(More)
A high-efficiency extreme ultraviolet (EUV) imaging spectrometer has been constructed and tested. The spectrometer employs a concave toroidal grating illuminated at normal incidence in a Rowland circle mounting and has only one reflecting surface. The toroidal grating has been fabricated by a new technique employing an elastically deformable submaster(More)
The Harvard College Observatory instrument on the Skylab was a seven-channel spectrometer-spectroheliometer operating in the 280-1340-A wavelength range and capable of a variety of observing modes encompassing both spatial and spectral scans of a wide range of solar features. The instrument design and operational performance are described in detail.
A telescope-spectrograph employing a photon-counting microchannel plate (MCP)-CODACON detector has been built, tested, and flown on a sounding rocket. The detector uses a curved-channel MCP proximity focused onto a coded anode array of 1024 channels spaced 25.4-mm center to center. High quantum efficiency is obtained by depositing a cesium iodide(More)
The procedures available for photometric calibration at extreme ultraviolet (EUV) wavelengths are outlined and the requirements for a secondary standard EUV photomultiplier defined. The performance of a number of commercially available channel electron multipliers over the 304-1350-A wavelength range is described and their suitability for use as secondary(More)
A small grazing incidence monochromator was flown on the NASA OSO-4 satellite to monitor variations in the absolute flux of the solar He II Lyman-alpha line at 303.8 A. The design of the instrument is described in some detail, and the procedures for photometric calibration are discussed. Examples are shown of the results obtained during the two-year period(More)