Artigo Acesso aberto Revisado por pares

The digital system ARTEMIS for real-time processing of radio transient emissions in the solar corona

1993; Springer Science+Business Media; Volume: 147; Issue: 2 Linguagem: Inglês

10.1007/bf00690725

ISSN

1573-093X

Autores

Dimitris Maroulis, G. Dumas, J.‐L. Bougeret, C. Caroubalos, M. Poqu�russe,

Tópico(s)

Geophysics and Gravity Measurements

Resumo

We present the real-time digital data processing system named ‘ARTEMIS’ that was developed and constructed by the Space Research Department (DESPA) of Paris-Meudon Observatory to digitize, calibrate, format, date, process, compress, and archive in real time signals from multichannel receivers. This system is controlled by a multiprocessor computer based on Motorola MC 68010/68020 processors; it permits the automatic, routine recording of 128 parallel channels at a rate up to 300 samples per second and per channel with a 12-bit accuracy (4096 levels of intensity); it is used to process and record the 120 channels of a multichannel solar radiospectrograph in the frequency range 110–469 MHz; the remaining 8 channels are used for a scanning spectrograph in the frequency range 30–80 MHz and a two-dimensional multicorrelator interferometer at 75.5 MHz. The large quantity of raw data is reduced in real-time from about 1.3 Gbytes to about 40 Mbytes per day by the use of an original algorithm for real-time data compression. It is expected that this new facility will allow us to build a very large data base of digitized and accurately calibrated solar events, in order to achieve statistical measurements over long periods of time.

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