Instrumentation for the space patrol of ionizing solar radiation: creating testing and future applications

Physics – Geophysics

Scientific paper

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Space Solar Patrol

Scientific paper

The paper discusses the situation with permanent monitoring (patrol) of ionizing solar radiation in a spectral range from 0.1 to 134 nm, which is most important for geophysics. At present monitoring of the ionizing radiation from the full disk of Sun is carried out only at the spectral ranges of 0.05-0.8 nm and above 115 (119) nm. In the Vavilov State Optical Institute (SOI) the special apparatus and also the methodology have been developed which enable to measure absolute fluxes from the full disk of Sun in VUV, EUV and soft X-ray spectral ranges (0.14-157 nm). A description is given of the entire set of instrumentation for such a space-based patrol comprising a radiometer with foil, film, and crystal filters and two diffraction-grating spectrometers of the grazing-beam and normal-incidence types. The apparatus have been tested in the laboratory vacuum chambers of the SOI and ESTEC and in this paper the principal results of its testing are presented. There are plans to launch the Space Solar Patrol mission at the Russian Module of the International Space Station.

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