An atlas of extreme-ultraviolet spectroheliograms from OSO-IV
OSO far UV solar spectroheliograms atlas, describing instrumentation, data aquisition, etc
Parkinson, W. H.↗
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Experiment on S57 (later OSO 3) satellite (cosmic ray charge and energy spectra)
Cosmic ray charge and energy spectra from OSO-3 experiments with details of detector design and operation
Kaplon, M. F.↗
Final data reduction and analysis of the AS and E OSO-4 grazing incidence X-ray telescope experiment
Final data analysis of grazing incidence of solar X ray telescope experiment of OSO- 4 satellite
Krieger, A.↗
The isotropy of the diffuse cosmic X-rays determined by OSO-III
Diffuse cosmic X rays observation by telescope aboard OSO 3 satellite, determining isotropy
Schwartz, D. A.↗
Re-interpretation of OSO-III scintillation counter measurements of hard solar X-ray spectra
Hard solar X-ray spectra measurements, reinterpreting OSO 3 scintillation counter response due to pulse pile-up
Hudson, H. S.↗
On the existence of a trap state for OSO- type satellites
Trap states existence in OSO type satellites, considering damping mechanism and computer results
Sen, A. K.↗
Delta-85 Orbiting Solar Observatory-H (OSO-H) Operations summary
The objectives of the Orbiting Solar Observatory (OSO-H) are discussed. Subjects considered are the: (1) mission objectives, (2) mission plan, (3) post launch operations, (4) communications, and (5) test operations. Illustrations of the satellite configuration and the Delta 85 launch vehicle are included.
Source record↗
Extreme ultraviolet and X-ray spectroheliograph for OSO-H
A complex scientific instrument was designed, fabricated, tested, and calibrated for launch onboard OSO-H. This instrument consisted of four spectroheliographs and an X-ray polarimeter. The instrument is designed to study solar radiation at selected wavelengths in the X-ray and the extreme ultraviolet ranges, make observations at the H-alpha wavelength, and measure the degree of polarization of X-ray emissions.
Sterk, A. A.↗
The NRL OSO-4 Bragg crystal spectrometer instrument
Two Bragg crystal spectrometers were placed on the OSO-4 satellite to study solar flare plasmas by their spectral emissions. The solar flare plasma parameters were measured with these spectrometers, which together covered a total wavelength range of 0.6 to 8.4 A. With these instruments, knowledge could be gained into the mechanisms governing the plasma behavior in the high temperature-low density regime of flare production and in solar evolution and elemental abundances in the sun. However, spacecraft limitations forced many restrictions on the design of the instrument, so the final instrument could not measure all the solar flare plasma state parameters.
Meekins, J. F.↗
A gamma ray monitor for the OSO-7 spacecraft
A 3 in. x 3 in. NaI(Tl) gamma ray (0.3 to 10 MeV) spectrometer with a CsI(Na) charged particle and anti-Compton shield has been developed for the Orbiting Solar Observatory (OSO-7) which was launched September 30, 1971. The instrument, designed for a rotating wheel compartment, utilizes a 377 channel quadratic PHA with accumulation times of 3, 1, or 0.5 minutes. Quick look and calibration data obtained via a direct data link to a minicomputer allows near real time monitoring and control of the experiment. Various commands changing the operating mode can be executed. The functions which can be commanded include: rotation of the quadrants in which data is collected by 90 deg; gain adjustment of the central detector over a 6:1 range; manual or automatic sequencing of calibrations; variations of accumulation times by telemetering selected channels; and selection of reference directions. A small X-ray detector covering the range 7.5 to 120 keV is also included.
Higbie, P. R.↗
A comparison of surface brightness measurements from OAO-2 and OSO-6
A comparison of surface brightness measurements of the night sky from the OAO-2 and OSO-6 satellites with ground observations shows good agreement between the space experiments but a systematic error in the zero point of the ground observations, indicating an additional atmospheric source of radiation.
Roach, F. E.↗
Results from the GSFC OSO 7 spectroheliograph
The capabilities of the pointed spectroheliograph on board the OSO 7 are discussed. The range and results of the instrument in recording the evolution of solar active regions and solar flares are considered.
Neupert, W. M.↗
Design of the solar X-ray instrument for OSO-H.
The OSO-H solar X-ray instrument monitors X rays from the sun in the energy range 1-300 keV, as well as the charged particle background. The electronics provide accurate logarithmic pulse-height analysis at the high counting rates expected under flare conditions. A high time resolution mode enables tudy the temporal development of a solar flare.
Harrington, T. M.↗
Results from OSO-IV - The long term behavior of X-ray emitting regions.
Analysis of images of the sun obtained with the aid of a grazing incidence X-ray telescope on board the OSO IV spacecraft in the 2.5 to 12-A waveband nearly continuously from Oct. 27, 1967, to May 12, 1968. The instrument had sufficient spatial resolution (one and four arc minutes) and temporal resolution (5 to 20 min) to estimate the spatial characteristics of X-ray emitting regions and to monitor the temporal behavior of individual active regions. Variations in the absence of flares of as much as a factor of 10 in the X-ray output of individual regions were observed, with typical durations ranging from several hours to several days. The X-ray time variations are related to observations at optical and radio wavelengths. The results are interpreted under the assumption that the X-ray time variations are caused by temperature changes in the coronal portions of active regions. The contribution of radiative losses to the energy budget of the coronal active region is estimated.
Krieger, A.↗
Star scanner attitude determination for the OSO-7 spacecraft.
Calculation of the inertial orientation of the OSO-7 spacecraft from the times at which known stars or planets transit planes fixed in the spacecraft. Both the reference planes and the timing information are provided by the star scanner instrument aboard the spacecraft, while the star identification and the statistical estimation of a set of parameters describing the spacecraft attitude are accomplished in a ground station computer facility. A recursive least-squares determination is made of a vector of first-order differential corrections to the attitude state vector. Preliminary analysis indicates the system accuracy to be 3 arc min in each attitude Euler angle.
Mackison, D. L.↗
OSO-7 orbiting solar observatory one year performance summary
The performance of the OSO-7 spacecraft during the first twelve months after launch is discussed. A summary description of the spacecraft and experiments is given. Line drawings of the satellite configuration, telemetry subsystem, electronics equipment, pneumatic equipment, and optical equipment are included.
Source record↗
The radiation monitor cosmic X-ray experiment OSO-1
A comprehensive technical description is presented of the Radiation Monitor which is part of the GSFC cosmic X-ray experiment to be flown on the OSO-1 satellite. The theory of operation, fabrication and assembly, and cone angle determination are reported.
Randall, R. F.↗
The radiation environment of OSO missions from 1974 to 1978
Trapped particle radiation levels on several OSO missions were calculated for nominal trajectories using improved computational methods and new electron environment models. Temporal variations of the electron fluxes were considered and partially accounted for. Magnetic field calculations were performed with a current field model and extrapolated to a later epoch with linear time terms. Orbital flux integration results, which are presented in graphical and tabular form, are analyzed, explained, and discussed.
Stassinopoulos, E. G.↗