Solar Physics

Members of the Space Physics Group are coordinators of the ARTEMIS radio spectrograph.

Radio Spectrography of the solar corona, at decimeter meter and decameter wavelengths, provides basic information on the origin and early evolution of many phenomena which later extend through the interplanetary medium and some of them reach the Earth. The Artemis IV solar radiospectrograph of the University of Athens is operating at the Thermopylae Satellite Station since 1996. Asof 2002 the observations cover the frequency range from 20 to 650 MHz. The spectrograph has the old 7-meter moving parabolic antenna for 110 to 650MHz and a new stationary antenna for the 20 to 110 MHz. There are two receivers operating in parallel, one sweep frequency for the whole range (10 spectrums/sec, 630 channels/spectrum) and one acousto-optical receiver for the range 270 to 470 MHz (100 spectrums/sec, 128 channels/spectrum). The daily operation is fully automated: pointing the antenna to the sun, starting and stopping the observations at preset times, data acquisition, and archiving on DVD; there is also remote control capability through modem or Internet. The instrument can be used either by itself to study the onset and evolution of solar radio bursts or in conjunction with other instruments such as the Nancy Decametric Array, the WIND/WAVES--STEREO/WAVES and the LOFAR low frequency receivers to study associated interplanetary phenomena.


National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, Greece.

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