ARTEMIS MARK-IV, THE NEW GREEK-FRENCH DIGITAL RADIO SPECTROGRAPH AT THERMOPYLES, GREECE

We present the new digital solar radio spectrograph located at the The rmopyles station, Greece, operated by the University of Athens. Observ ations cover the range from 110 to 600 MHz, using a 7-m parabolic ante nna. The reception system uses two techniques in parallel: sweep frequ ency and multi-channel, the latter being based on the Acousto-Optical technique. The data acquisition system is based on two subsystems, a S un Sparc-5 workstation and a front end based on a VME Motorola system. The two subsystems are connected through the Ethernet and are operate d using the VxWorks real-time package. The daily operation is complete ly automated: pointing of the antenna to the sun, starting and stoppin g the observations at pre set times, acquiring data, compressing data by silence suppression in real time, and archiving the data on a routi ne manner on DAT tapes. Apart from its usual function, this instrument will be used in conjunction with other instruments, including the Nan cay decameter array and the low frequency radio receivers on the Wind spacecraft.