The Hard Solar X-Ray Spectrometer on Board the ESRO Td-1a Satellite

X- and γ-Ray Measurements During the 1972, August 2 and 7 Large Solar Flares

“…The X-ray time profile, partic ularly at high energies, coincides fairly well with the shape of the microwave radio burst. Figure 10 shows the time correlation between our data, radio flux measurements and TDl and Intercosmos 7 experiments where the time resolution was better (Van Beek et al, 1973, Valnicek et al, 1973. The two types of radiation typically show a 'step' profile in time with intermediary maxima 1516, 151730, 1519 UT (Figures 9 and 10).…”

44. Astronomical Observations from Outside the Terrestrial Atmosphere

“…Hard X-rays of the Sun (20-1000 keV) are recorded also by a 12-channel spectrophotometer placed on the satellite ESRO TD-1A launched on 12 March, 1972, with a time resolution of 1-2-4-8 s (28).…”