A new radio spectrometer, CALLISTO, is presented. It is a dual-channel frequency-agile receiver based on commercially available consumer electronics. Its major characteristic is the low price for hardware and software, and the short assembly time, both two or more orders of magnitude below existing spectrometers. The instrument is sensitive at the physical limit and extremely stable. The total bandwidth is 825 MHz, and the width of individual channel is 300 kHz. A total of 1000 measurements can be made per second. The spectrometer is well suited for solar low-frequency radio observations pertinent to space weather research. Five instruments of the type were constructed until now and put into operation at several sites, including Bleien (Zurich) and NRAO (USA). First results in the 45–870 MHz range are presented. Some of them were recorded in a preliminary setup during the time of high solar activity in October and November 2003.
KeywordsSolar Activity Physical Limit Assembly Time Space Weather Solar Radio
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- Bastian, T. S.: 2004, in D. E. Gary and C. U. Keller (eds.), Solar and Space Weather Radiophysics, Kluwer ASSL, p. 47.Google Scholar
- Cole, T. W., Stewart, R. T. and Milne, D. K.: 1978, Astr. Astrophys. 67, 277.Google Scholar
- Güdel, M. and Benz, A. O.: 1988, Astr. Astrophys. Sup. 75, 243.Google Scholar
- Isliker, H. and Benz, A. O.: 1994, Astr. Astrophys. Sup. 104, 145.Google Scholar
- Kondo, T., Isobe, T., Igi, S., Watari, S. and Tokumaru, M.: 1995, J. Communications Res. Lab. 42, 111.Google Scholar
- Lecacheux, A., Rosolen, C., Davis, M., Bookbinder, J., Bastian, T. S. and Dulk, G. A.: 1993, Astr. Astrophys. 275, 670.Google Scholar
- Mann, G., Aurass, H., Voigt, W. and Paschke, J.: 1992, in ESA, Proceedings of the First SOHO Workshop: Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition, 129.Google Scholar
- McLean, D. J. and Labrum, N. R.: 1985. Solar Radiophysics, Cambridge University Press, Cambridge, p. 516.Google Scholar
- Wild, J. P. and McCready, L. L.: 1950, Australian J. Sci. Res. A 3, 541.Google Scholar