THE SORS EXPERIMENT IN THE CORONAS-I PROJECT: SOME RESULTS V. V. FOMICHEV, V. N. ORAEVSKY, S. A. PULINETS,I. S. PRUTENSKY and R. V. GORGUTSA IZMIRAN, 142092 Troitsk, Moscow Region, Russia Z. KLOS, A. KIRAGA and H. ROTHKAEHL SRC Warszawa, ul. Bartycka, 18a, 00 –716 Warszawa, Poland A. KR ¨ UGER, J. HILDEBRANDT, H. AURASS, A. KLASSEN and G. MANN AIP, An der Sternwarte 16, D-14482 Potsdam, Germany (Received 2 October, 1996) Abstract. A description of the scientific experiment ‘SOlar Radio Spectrometer’ (SORS) of the CORONAS-I project is given. The goal of the experiment is the investigation of the solar radio emission and plasma wave phenomena in the Earth’s ionosphere in the wide frequency band 100 kHz – 300 MHz. Results of the SORS observations for a three-month working period are discussed, and proposals for improvement of the SORS equipment for future CORONAS missions are made. 1. Introduction The CORONAS project is a solar-dedicated space project. Its goals include the study of many problems of solar and solar-terrestrial physics, e.g., the internal structure of the Sun, different phenomena of solar activity including solar flares, as well as the influence of solar activity on the environment of the Earth. The first of three spacecraftof the CORONAS project, the CORONAS-I satellite, was launched on March 2, 1994. The satellite was set into a near polar orbit with an altitude of about 500 km and an inclination of about 83 . The orbit is quasi-synchronous to assure recurrence of the 20-day periods when the orbit is outside the Earth’s shadow. A general description of the CORONAS-I project, the scientific objectives, and the individual experiments were given by Oraevsky, Fomichev, and Zhugzhda (1990). One of them is the SORS (Solar Radio Spectrometer) experiment. The goal of the SORS investigation on the CORONAS-I spacecraft is to provide coverage of radio and plasma wave phenomena in the wide frequency band from 100 kHz up to 300 MHz. Such measurements yield information on the parameters of the solar atmosphere and interplanetary space, and also on the disturbances (energetic particles, shock waves, coronal mass ejections) propagating through interplanetary space to the Earth. The results of the SORS observations in the CORONAS-I project of solar radio bursts are given below. Solar Physics 171: 221–224, 1997. c 1997 Kluwer Academic Publishers. Printed in Belgium.