The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A satellite-borne, high-sensitivity crystal X-ray spectrometer and an X-ray polarimeter have been orbited in the OSO-8 spacecraft. In the quiet Sun or solar-flare mode, the spectrometer records a spectrum of solar X-rays from 1.4 to 8 keV every 10 s. In the stellar mode, the instrument measures the spectra from 2 to 8 keV of celestial X-ray sources. The focusing crystal X-ray polarimeter measures...