Abstract
The Solar Maximum Mission Gamma Ray Experiment (SMM GRE) utilizes an actively shielded, multicrystal scintillation spectrometer to measure the flux of solar gamma rays. The instrument provides a 476-channel pulse height spectrum (with energy resolution of ∼7% at 662 keV) every 16.38 s over the energy range 0.3–9 MeV. Higher time resolution (2 s) is available in three windows between 3.5 and 6.5 MeV to study prompt gamma ray line emission at 4.4 and 6.1 MeV. Gamma ray spectral analysis can be extended to ≳15 MeV on command. Photons in the energy band from 300–350 keV are recorded with a time resolution of 64 ms. A high energy configuration also gives the spectrum of photons in the energy range from 10–100 MeV and the flux of neutrons ≳20 MeV. Both have a time resolution of 2 s. Auxiliary X-ray detectors will provide spectra with 1-sec time resolution over the energy range of 10–140 keV. The instrument is designed to measure the intensity, energy, and Doppler shift of narrow gamma ray lines as well as the intensity of extremely broadened lines and the photon continuum. The main objective is to use this time and spectral information from both nuclear gamma ray lines and the photon continuum in a direct study of the dynamics of the solar flare/particle acceleration phenomena.
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References
Bai, T. and Ramaty, R.: 1976, Solar Phys. 49, 343.
Chambon, G., Hurley, K., Niel, M., Talon, R., Vedrenne, G., Likine, O. B., Kouznetzov, A. V., and Estouline, I. V.: 1978, in T. L. Cline and R. Ramaty (eds.), Gamma Ray Spectroscopy in Astrophysics, Symposium Proceedings, NASA TM 79618, p. 70.
Chupp, E. L.: 1979, ‘Implications of Gamma Ray Observations for Particle Acceleration (Experimental Prospects)’, presented at the La Jolla Institute Workshop on Particle Acceleration Mechanisms in Astrophysics, La Jolla, California. Proceedings to be published by American Institute of Physics.
Chupp, E. L., Forrest, D. J., Higbie, P. R., Suri, A. N., Tsai, C.,and Dunphy, P. P.: 1973, Nature 241, 333.
Chupp, E. L., Forrest, D. J., and Suri, A. N.: 1975, in S. R. Kane (ed.), ‘Solar Gamma-, X-, and EUV Radiation’, IAU Symp. 68, 341.
Crannell, C. J., Ramaty, R., and Crannell, H.: 1977, Proceedings of 12th ESLAB Symposium, Frascati, Italy, p. 213.
Elliot, H.: 1973, in R. Ramaty and R. G. Stone (eds.), High Energy Phenomena on the Sun, NASA SP-342, p. 12.
Forrest, D. J., Higbie, P. R., Orwig, L. E., and Chupp, E. L.: 1972, Nucl. Instr. Methods 101, 567.
Gruber, D. E., Peterson, L. E., and Vette, J. L: 1973, in R. Ramaty and R. G. Stone (eds.), High Energy Phenomena on the Sun, NASA SP-342, p. 147.
Hudson, H. S.: 1978, Solar Phys. 57, 237.
Hudson, H. S., Baity, W. A., Gruber, D. E., Knight, F. K., Nolan, B. L., Matteson, J. L., and Peterson, L. E.: 1978, Bull. Am. Astron. Soc. 10, 516.
Kinzer, R. L., Kurfess, J. D., Johnson, W. N., and Share, G. H.: 1977, ‘Monte Carlo Simulation of the SMM Gamma Ray Detector’, Unpublished Naval Research Laboratory Report for the SMM project collaboration.
Kuzhevskii, B. M.: 1969, Sov. Astron.-A J. 12, 595.
Lingenfelter, R. E. and Ramaty, R.: 1967, in B. S. P. Shen (ed.), High-Energy Nuclear Reactions in Astrophysics, W. A. Benjamin, Inc., New York, p. 99.
Peterson, L. E. and Winckler, J. R.: 1959, J. Geophys. Res. 64, 697.
Ramaty, R., Kozlovsky, B., and Suri, A. N.: 1977, Astrophys. J. 214, 617.
Ramaty, R., Colgate, S. A., Dulk, G. A., Hoyng, P., Knight, J. W., Lin, R. P., Melrose, D. B., Shapiro, P. R., Smith, D. F., and Van Hollebeke, M.: 1979, in P. A. Sturrock (ed.), Solar Flares, Colorado Associate University Press, in press. (Proceedings of the Second Skylab Workshop on Solar Flares, Boulder, Colorado, 1976–1977.)
Švestka, Z.: 1976, Solar Flares, D. Reidel Publ. Co., Dordrecht, Holland, p. 89.
Van Hollebeke, M. A. I., MaSung, L. S., and McDonald, F. B.: 1975, Solar Phys. 41, 189.
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Forrest, D.J., Chupp, E.L., Ryan, J.M. et al. The gamma ray spectrometer for the Solar Maximum Mission. Sol Phys 65, 15–23 (1980). https://doi.org/10.1007/BF00151381
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DOI: https://doi.org/10.1007/BF00151381