X-ray photometer RF

The X-ray photometer RF is designed to measure the solar X-ray radiation in the soft spectral range. In addition to continuous monitoring of the solar radiation in the X-ray range, the instrument can be used as an indicator for automatic switching-on the scientific instrumentation for registering the processes of the active solar events, assuming a change in the solar X-ray radiation as a "precursor" of these phenomena. The photometer is oriented along the -Z-axis of the subsatellite, i.e. toward the Sun.
The photometer consists of two units: the detector unit and electronics unit. The photometer is the scintillating detector with the aluminium foil in front of it to prevent penetration of the soft particles and X-rays.
The output signal of the detector is passed to the two-channel amplitude analyzer where it is selected in two ranges: 10-15 keV and15-60 keV. The impulses from the channels with a fixed amplitude are transferred to the electronics unit where they are accumulated during 0.8 s (time of one exposure step).
The maximum capacity of the detector is 183441 imp/0.8 sec., so for higher flux intensity (which is hardly probable) the detector data are not valid.

Contact persons:
F.Farnik - Astronomical Inst., Czech Acad. Sci., Ondrejov, Czech Republic.
L.Triskova - Institute of Atmospheric Physics, Czech Acad. Sci., Prague, Czech Republic.

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