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Chupp, E. L.

Publications and source records attributed to Chupp, E. L..

At least 91 records · Page 5
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NASA NTRS1974

Gamma ray observations during the August 1972 solar activity

During the solar activity period in August 1972, the UNH gamma ray monitor on the OSO-7 satellite measured gamma ray line and continuum fluxes of solar origin on at least two occasions; August 4 and 7. In this discussion, the experiment and the gamma ray line observations are reviewed with a few brief remarks on interpretation. The specific observations discussed are measurements of gamma ray lines at 0.51 and 2.2 MeV during two of the largest optical solar flares. Evidence for lines at other energies is also given.

Chupp, E. L.↗
NASA NTRS1973

Observations of Gamma-ray Emission in Solar Flares

The observations of gamma ray emission made from the OSO-7 satellite in connection with two solar flares in early August 1972 are reported. The details of the measurements and a preliminary interpretation of some of the observed features are given.

Forrest, D. J.↗
NASA NTRS1973

Gamma ray and neutron measurements and their relation to the solar flare problem.

In order to interpret recent observations of solar gamma ray lines from OSO-7, we consider the possible nuclear reactions which can occur and assess their relative importance in the solar environment. This analysis shows that about 3 times 10 to the 32nd power protons (energy greater than 30 MeV) must have been produced during the initial phase of the flare on Aug. 4, 1972. The ability to determine the temperature in the solar region where the positrons annihilate has been estimated from the 0.51 MeV line width, giving a temperature there of less than 7 million deg K. The major conclusions from these observations are discussed and some outstanding problems are mentioned. Finally, requirements for the next generation of solar gamma ray and neutron experiments are discussed.

Chupp, E. L.↗
NASA NTRS1973

Observations of gamma-ray emission in solar flares

Solar flare associated gamma ray observations are reviewed. Data cover He-3, line emission, and absolute intensity associated with gamma ray production. Results are given in graphs and tables.

Forrest, D. J.↗
NASA NTRS1973

Solar gamma ray and neutron observations

The present status of knowledge concerning the impulsive and the continuous emission of solar gamma rays and neutrons is reviewed in the light of the recent solar activity in early August 1972. The gamma ray spectrometer on Orbiting Solar Observatory-7 (OSO-7) has observed the sun continuously for most of the activity period except for occultation by the earth. In association with the 2B flare on August 4, 1972, and the 3B flare on August 7, 1972, the monitor provides evidence for solar gamma ray line emission in the energy range from 300 keV to 10 MeV. A summary of all the results available from preliminary analysis of the data will be given.

Chupp, E. L.↗
NASA NTRS1972

Solar gamma rays and neutron observations

The present status of knowledge concerning the impulsive and the continuous emission of solar gamma rays and neutrons is reviewed in the light of the recent solar activity in early August 1972. The gamma ray spectrometer on OSO-7 has observed the sun continuously for most of the activity period except for occultation by the earth. In association with the 2B flare on 4 August 1972 and the 3B flare on 7 August 1972, the monitor provides evidence for solar gamma ray line emission in the energy range from 300 keV to 10 MeV. A summary of all the results available from preliminary analysis of the data will be given. Significant improvements in future experiments can be made with more sensitive instruments and more extensive time coverage of the sun.

Chupp, E. L.↗
NASA NTRS1972

A gamma ray monitor for the OSO-7 spacecraft.

A NaI(T2) gamma ray spectrometer with a CsI(Na) charged particle and anti-Compton shield has been developed for the spacecraft. The spacecraft telemetry system employs a 800 Hz clock and reads data out on a basic 32-word (byte) Main Frame cycle. The data from the instrument include spectral data, X-ray data, and housekeeping data. The gamma ray pulses from the anode of the central detector flow through the front end electronics, where they are amplified by a charge sensitive preamplifier. The admission of the desired gamma ray into the data stream is controlled by a linear gate.

Higbie, P. R.↗
NASA NTRS1972

An electronically gated gamma and X-ray calibration scheme.

The construction and use are described for a radioactive calibration source that produces an electronic gating pulse when a calibration gamma ray is emitted and makes it possible to employ this source in many calibration or stabilizing tasks without the disadvantage of having to introduce extra counts into the unknown spectrum. The described source is radioactively safe, easy to construct, and has the ability of producing gating efficiencies as high as 98%.

Forrest, D. J.↗
NASA NTRS1971

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.↗