[en] The observed quasiperiodic atmospherical γ-radiation intensity variations with the amplitude of about 10% can be due to air density oscillations caused by stratospheric internal gravity waves. The vertical intensity is shown to be more greatly subjected to variations with the period of about 5 min. Pressure variations synchronous with those of γ-radiation are of the amplitude no more than 0.5%

[en] The results of balloon measurements of altitude, energy and angular dependences of gamma-ray intensity at energies above 40 MeV by means of telescopes with spark chambers are presented. (orig./WBU)

[en] Measurements were carried out with the help of a wide-aperture gamma-telescope with spark chambers in two flights of high-altitude balloons in October, 12, 1972 and July, 10, 1974. The variable gamma-radiation from the galactic source Cyg X-3 has been observed on October, 12, 1972. The comparison of two flight results is presented. (orig.)

[en] A scintillating fiber sampling calorimeter telescope (SSCT (SF)) is proposed which is to be operated on board a satellite for the observation of cosmic gamma rays ranging from 200 MeV to 200 GeV. The idea of SSCT (SF) is based on the experience in developing a Si(Li)/Pb sampling calorimeter telescope (SSCT (Si)); SSCT(SF) replaces the Si detectors in SSCT(Si) by scintillating fibers. Some key parameters of SSCT(Si) are: the active area is 2,500 cm², effective area 1,500 cm², the median angular reoslution 1.6 degree at 1 GeV, 0.34 degree at 10 GeV, 0.21 degree at 30 GeV, and the r.m.s energy resolution is 20, 17 and 18% at 1, 10 and 100 GeV, respectively. If a thicker calorimeter is used, 17%/√E(GeV) is possible. SSCT(SF) is now under development. From a preliminary test, we expect that the angular resolution of SSCT(SF) is, at worst, almost the same as SSCT(Si), and the energy resolution could be better than 30% at 1 GeV. Probably almost the same energy resolution is obtainable. An effective area of one order of magnitude larger than the EGRET can be attained with a low cost