Abstract
The device described has been developed to provide solar X-ray flux data as a standard measurement in daytime launchings of the British high altitude research rocket, Skylark . This measurement is of particular interest in those rounds primarily concerned with ionospheric studies. It is shown that the scope of an X-ray monitor may quite simply be extended to cover the wide range of intensities occurring with the different degrees of solar activity. In a series of launchings, already begun, data on the variation of short-wavelength solar X-radiation are being accumulated, whilst comparison with concurrent rocket ionospheric studies may add to an understanding of the role of solar X-radiation in this field. The results of a first rocket flight of the monitor, which took place in “quiet” solar conditions in the autumn of 1959, are reported and discussed. The measured X-ray flux of 1–4 × 10 −2 erg cm −2 sec −1 in the 8–20 A band is compared with that obtained in a U.S. photon counter rocket measurement at about the same time.
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